G. Gábor - Academia.edu (original) (raw)

Papers by G. Gábor

Research paper thumbnail of Study on the oestrus synchronizing effect of a prostaglandin- analogue (Reprodinsmallcap˜r) in rabbits

Magyar Allatorvosok Lapja, 1990

Research paper thumbnail of The evaluation of the reproduction ability of young rams. 2nd paper: possibilities of the evaluation of rams testes

Research paper thumbnail of Early Detection of Pregnancy and Embryonic Loss in Dairy Cattle by ELISA Tests

Reproduction in Domestic Animals, 2007

Over a 25-month period 8118 blood samples were assayed for the presence of the serum pregnancy sp... more Over a 25-month period 8118 blood samples were assayed for the presence of the serum pregnancy specific-protein B (PSPB) and progesteron (P4) concentrations on three Hungarian large-scale dairy farms. Pregnancy (n ¼ 4085) was checked by BioPRYN assay at 30-36 days post-insemination (PI). Samples from all cows that tested not pregnant and from cows with an optical density (OD) reading in the BioPRYN test that was between 0% and 30% above the cutoff OD value were tested for serum P4 concentration. According to serum P4 concentration, cows were assigned to three categories: high (>4 ng/ml), medium (2-4 ng/ml) and low (<2 ng/ml) serum progesterone. The authors predicted a presumed (low) or possible (medium) late embryonic loss (LEL) or maintenance of the pregnancy (high). A total of 710 LELs were detected (17.4%) and 31.8% of them were predicted because of a low OD value at 30-36 days after insemination. Lower PSPB serum level significantly refers for LEL (p < 0.0001). The prediction rate for the true embryonic loss was 31.8% when OD cutoff from 0% to + 30% of cutoff was examined while it was 62.5% when the threshold was OD cutoff of 0% to 10% of cutoff. The authors conclude that BioPRYN was useful for prediction of a part of LEL in dairy cows and serum P4 concentration in these cows related to the rate of LEL.

Research paper thumbnail of Pregnancy Loss in Dairy Cattle: Relationship of Ultrasound, Blood Pregnancy-Specific Protein B, Progesterone and Production Variables

Reproduction in Domestic Animals, 2016

Research paper thumbnail of Improving the reproductive efficiency by zoo-technical methods at a dairy farm

Reproduction in domestic animals = Zuchthygiene, 2006

This trial was conducted on a Hungarian dairy farm between July 2001 and December 2004. The objec... more This trial was conducted on a Hungarian dairy farm between July 2001 and December 2004. The objective of this work was to improve the reproductive efficiency with relatively high milk production. At the beginning of this trial blood and fodder samples were taken for checking the metabolic status of the animals in order to determine their health condition. The nutritive value of the daily ration for all groups met with the requirements of the Hungarian National Standard and almost all serum metabolic parameters differed between the milking and pregnant animals. Early pregnancy detection (by ultrasound) and ovulation synchronizing methods were introduced to optimize reproductive performance. The oestrus cycle was also checked by ultrasound and open cows were treated by the appropriate method in order to inseminate them as soon as possible. Efficiency of artificial insemination (AI) followed by a single prostaglandin F2alpha (PGF2alpha) and Ovsynch treatment was similar (30.8% and 29%)...

Research paper thumbnail of Intravaginal prostaglandin F2 alpha for the treatment of metritis and pyometra in the bitch

Acta veterinaria Hungarica, 1999

The purpose of this study was to determine whether intravaginal prostaglandin F2 alpha (PGF2 alph... more The purpose of this study was to determine whether intravaginal prostaglandin F2 alpha (PGF2 alpha) would be effective for the treatment of metritis or pyometra in the bitch. Seventeen bitches with metritis or pyometra were treated with PGF2 alpha. Prostaglandin F2 alpha (150 micrograms/kg body weight) was administered once or twice daily by infusing 0.3 ml per 10 kg body wt into the vaginal lumen. Bitches were also treated with amoxicillin (15 mg/kg body wt/48 h) and/or gentamicin (4 mg/kg body wt/day) administered as intramuscular (i.m.) injections. Fifteen bitches were treated successfully with intravaginally administered PGF2 alpha for 3 to 12 days and with intramuscularly administered antibiotics for 4 to 12 days. Success of treatment was judged by cessation of vaginal discharge, the absence of fluid in the uterus as determined by ultrasonography, and the overall health status of the animal. As two bitches with pyometra showed clinical deterioration in spite of medical treatmen...

Research paper thumbnail of Effect of severe energy restriction and refeeding on thyroid hormones in bulls

Acta veterinaria Hungarica, 1995

Fifty-three Holstein-Friesian breeding bulls (944.99 +/- 14.59 kg) were fasted for 4 weeks. The i... more Fifty-three Holstein-Friesian breeding bulls (944.99 +/- 14.59 kg) were fasted for 4 weeks. The influence of feeding on thyroid hormones was studied by comparing a starting point with a 4-week fasting period and a refeeding period. Blood samples were taken via a jugular vein catheter at 8:00 a.m. one day before, then once every week during, and two times after the fasting period. Plasma thyroxine (T4) and triiodothyronine (T3) levels were determined by direct radioimmuno-assay. The concentration of T4 and T3 decreased during fasting. The concentration of T3 increased after refeeding, but that of T4 did not. These data suggest that fasting is associated with a decrease in the peripheral conversion of T4 to T3 and, consequently, less T4 is converted into T3.

Research paper thumbnail of Computer analysis of video and ultrasonographic images for evaluation of bull testes

Theriogenology, 1998

The objectives of this study were to determine relationships between scrotal size (SC; estimated ... more The objectives of this study were to determine relationships between scrotal size (SC; estimated from a video image) and testicular size, and between ultrasonographic echotexture of the testis and seminiferous tubule area in bulls. Video images of the scrotum of 49 Holstein-Friesian (H-F) bulls were recorded and digitized. Scrotal width and length were measured with custom software. After slaughter, scrotums (containing testes) were excised, SC and testicular height, width and volume were measured, and the testes were examined ultrasonographically. Correlations between SC and testicular width or volume (r=0.86, P<0.001 and r=0.84, P<0.001, respectively) were much higher than those between scrotal width and testicular width or volume (I"=0.23, P<0.11 and r=0.28, P<0.06). Histological examination of the testes was performed in 31 of the bulls. Ultrasonographic echotexture of the testes (determined with custom software) was highly correlated (r~-0.5, P<0.005) with seminiferous tubule area. Although SC was superior to video imaging for estimating testicular size, ultrasonographic imaging of the testes has considerable potential for the evaluation oftesticular function in bulls.

Research paper thumbnail of Endocrine and thermal responses to GnRH treatment and prediction of sperm output and viability in Holstein-Friesian Breeding Bulls

Theriogenology, 1998

A study was conducted to determine changes in serum LH and testosterone concentrations and in scr... more A study was conducted to determine changes in serum LH and testosterone concentrations and in scrotal surface temperature (SST; measured with infrared thermography) following GnRH treatment and to predict the number of spermatozoa collected and the proportion that were viable. Holstein-Friesian breeding bulls (n = 22, average age, 24.3 m.o.; range, 15 to 41 m.o.) were examined twice 30 d apart. Concurrently, semen was collected twice weekly with an artificial vagina. Treatment with GnRH (100 micrograms, i.m.) increased (P &lt; 0.0001) serum LH and testosterone concentrations and increased (P &lt; 0.0001) SST (range 0.6 to 1.1 degrees C; P &lt; 0.05) at the top and bottom of the scrotum. In regression models to predict the total number of spermatozoa, significant independent variables included ultrasonic echotexture of the testes (negative slope), scrotal width (positive slope) and SST at the bottom of the scrotum 45 min after GnRH treatment (positive slope). In regression models to predict the percentage of live spermatozoa, ultrasonic echotexture was a significant independent variable (negative slope). Measurement of testicular ultrasonic echotexture and SST after GnRH treatment augmented measurement of testicular size for predicting the number and percentage of live spermatozoa.

Research paper thumbnail of Relationship among testosterone response to GnRH administration, testes size and sperm parameters in Holstein-Friesian bulls

Theriogenology, 1995

The investigation of the fertility capacity of A.I. bulls is one of the most important factors in... more The investigation of the fertility capacity of A.I. bulls is one of the most important factors in their genetic improvement. The aim of this study was to examine the relationship between the results of the GnRH test and the measured and calculated size of the testicles and sperm parameters (sperm density and velocity, percentage of live and motile spermatozoa). Data was collected during three experiments from a total of 81 Holstein-Friesian breeding bulls at the National Artificial Insemination Centre of Hungary. In Experiment I. a very close correlation (r=0.64, p<O.OOl ; r=0.66, p<O.OOl ; r=0.99, p<O.OOl; r=0.75, pcO.001) was found between the size of testes (weight, volume, width, length) and the calculated volume. According to the data, we may calculate volume based on the width of testicles measured by sonography.

Research paper thumbnail of Effects of GnRH treatment on scrotal surface temperatures in bulls

Canadian Journal of …, 2001

Two experiments were conducted to characterize scrotal surface temperature (SST) in bulls treated... more Two experiments were conducted to characterize scrotal surface temperature (SST) in bulls treated with gonadotropin releasing hormone (GnRH). In Experiment 1, Angus bulls (n = 10, 18 mo, 597 kg) were given GnRH (400 ng/kg) or saline, IV. Bottom SST increased approximately ...

Research paper thumbnail of Morphologic, endocrine and thermographic measurements of testicles in comparison with semen characteristics in mature Holstein–Friesian breeding bulls

Animal Reproduction Science, 1998

. Twenty Holstein-Friesian breeding bulls 62-79 months of age were examined 3 times, at Ž . 30-da... more . Twenty Holstein-Friesian breeding bulls 62-79 months of age were examined 3 times, at Ž . 30-day intervals. Scrotal thermograms for assessment of scrotal surface temperature SST and blood samples for plasma testosterone concentrations were taken just before and then 45 and 90 Ž . min, respectively, after treatment with GnRH 50 mg, Gonavet, i.m. per bull . Following GnRH Ž treatment, there generally were significant increases in mean values of both top SST range, y0.1 . Ž . to 1.48C and bottom SST range, 0.3 to 1.88C . Scrotal circumference was highly repeatable but SST and video-measurements of scrotal dimensions were less repeatable, because apparently they were affected by ambient temperature. Plasma testosterone concentrations before GnRH treatment were more repeatable than those after GnRH treatment. Correlations between examinations of 0.67 to 0.81 and y0.14 to 0.47, respectively, but the converse was true for SST measurements. Semen was collected with an artificial vagina 3 times per week for 12 weeks starting 2 weeks before the first examination. The total number of spermatozoa per ejaculate was highly repeatable and the percentage of motile and live spermatozoa were relatively consistent. Separate regressions for each variable and for each examination were conducted for these 3 semen characteristics as dependent ) Corresponding author. 0378-4320r98r$19.00 q 1998 Elsevier Science B.V. All rights reserved.

Research paper thumbnail of Comparative Study of Different Methods for Dog Semen Cryopreservation and Testing Under Clinical Conditions

Acta Veterinaria Hungarica, 2000

The extenders and freezing rates from three different freezing protocols were combined and compar... more The extenders and freezing rates from three different freezing protocols were combined and compared to each other in order to study the post-thawing acrosome integrity and fertility of frozen dog sperm. A commercial bovine TRIS-base extender (TRILADYL) and two self-made canine semen extenders (Norwegian and Dutch) were combined with a conventional bovine and two canine freezing regimes, and acrosome integrity of frozen/thawed spermatozoa was assessed by fluorescein isothiocyanate conjugated peanut agglutinin staining (FITC-PNA). Differences between freezing/thawing protocols were reflected in the proportion of cells with acrosomal damage and not based on motility results. It was concluded that during dog semen cryopreservation extenders had less influence on the post-thawing sperm quality than did the freezing rates. The optimal extender/freezing rate combination (TRILADYL/Norwegian) was used in the clinical practice to evaluate the fertility of frozen sperm administered by intraute...

Research paper thumbnail of Intravaginal Prostaglandin F 2Α for the Treatment of Metritis and Pyometra in the Bitch

Acta Veterinaria Hungarica, 1999

The purpose of this study was to determine whether intravaginal prostaglandin F2α(PGF2α) would be... more The purpose of this study was to determine whether intravaginal prostaglandin F2α(PGF2α) would be effective for the treatment of metritis or pyometra in the bitch. Seventeen bitches with metritis or pyometra were treated with PGF2α. Prostaglandin F2α(150 (g/kg body weight) was administered once or twice daily by infusing 0.3 ml per 10 kg body wt into the vaginal lumen. Bitches were also treated with amoxicillin (15 mg/kg body wt/48 h) and/or gentamicin (4 mg/kg body wt/day) administered as intramuscular (i.m.) injections. Fifteen bitches were treated successfully with intravaginally administered PGF2αfor 3 to 12 days and with intramuscularly administered antibiotics for 4 to 12 days. Success of treatment was judged by cessation of vaginal discharge, the absence of fluid in the uterus as determined by ultrasonography, and the overall health status of the animal. As two bitches with pyometra showed clinical deterioration in spite of medical treatment, ovariohysterectomy was performed ...

Research paper thumbnail of Improving reproductive performance in lactating dairy cows by synchronising ovulation or inducing oestrus

Acta Veterinaria Hungarica, 2002

Lactating crossbred Holstein-Friesian dairy cows (n = 331) were started on an Ovsynch regimen 68 ... more Lactating crossbred Holstein-Friesian dairy cows (n = 331) were started on an Ovsynch regimen 68 ± 8.2 days after calving; 200 µg GnRH intramuscularly (i.m.) on Days 0 and 9, and 35 mg prostaglandin F2a i.m. on Day 7. Thirty-eight and 31 cows (11.5 and 9.4%, respectively) were in oestrus on Days 0 to 6 and 7 to 8, respectively, and inseminated, and the remainder were fixed-time inseminated (on Day 10). For these three groups, pregnancy rates (60-65 days after breeding) were 31.6, 38.7 and 34.0%, respectively (P = 0.82) and calving rates were 100, 100 and 89.9% (P = 0.23). In a preliminary trial, twelve lactating cows (45 to 60 days postpartum) with inactive ovaries were given 1500 IU eCG i.m.; 10 were in oestrus within 10 days after treatment (and inseminated) and eight of these were pregnant (30 days after breeding). The Ovsynch program resulted in acceptable reproductive performance in cyclic cows and eCG treatment has considerable promise for inducing oestrus in anoestrous cows.

Research paper thumbnail of Factors Influencing Pregnancy Rate and Late Embryonic Loss in Dairy Cattle

Reproduction in Domestic Animals, 2007

Research paper thumbnail of Early Detection of Pregnancy and Embryonic Loss in Dairy Cattle by ELISA Tests

Reproduction in Domestic Animals, 2007

Over a 25-month period 8118 blood samples were assayed for the presence of the serum pregnancy sp... more Over a 25-month period 8118 blood samples were assayed for the presence of the serum pregnancy specific-protein B (PSPB) and progesteron (P4) concentrations on three Hungarian large-scale dairy farms. Pregnancy (n ¼ 4085) was checked by BioPRYN assay at 30-36 days post-insemination (PI).

Research paper thumbnail of Study on the oestrus synchronizing effect of a prostaglandin- analogue (Reprodinsmallcap˜r) in rabbits

Magyar Allatorvosok Lapja, 1990

Research paper thumbnail of The evaluation of the reproduction ability of young rams. 2nd paper: possibilities of the evaluation of rams testes

Research paper thumbnail of Early Detection of Pregnancy and Embryonic Loss in Dairy Cattle by ELISA Tests

Reproduction in Domestic Animals, 2007

Over a 25-month period 8118 blood samples were assayed for the presence of the serum pregnancy sp... more Over a 25-month period 8118 blood samples were assayed for the presence of the serum pregnancy specific-protein B (PSPB) and progesteron (P4) concentrations on three Hungarian large-scale dairy farms. Pregnancy (n ¼ 4085) was checked by BioPRYN assay at 30-36 days post-insemination (PI). Samples from all cows that tested not pregnant and from cows with an optical density (OD) reading in the BioPRYN test that was between 0% and 30% above the cutoff OD value were tested for serum P4 concentration. According to serum P4 concentration, cows were assigned to three categories: high (>4 ng/ml), medium (2-4 ng/ml) and low (<2 ng/ml) serum progesterone. The authors predicted a presumed (low) or possible (medium) late embryonic loss (LEL) or maintenance of the pregnancy (high). A total of 710 LELs were detected (17.4%) and 31.8% of them were predicted because of a low OD value at 30-36 days after insemination. Lower PSPB serum level significantly refers for LEL (p < 0.0001). The prediction rate for the true embryonic loss was 31.8% when OD cutoff from 0% to + 30% of cutoff was examined while it was 62.5% when the threshold was OD cutoff of 0% to 10% of cutoff. The authors conclude that BioPRYN was useful for prediction of a part of LEL in dairy cows and serum P4 concentration in these cows related to the rate of LEL.

Research paper thumbnail of Pregnancy Loss in Dairy Cattle: Relationship of Ultrasound, Blood Pregnancy-Specific Protein B, Progesterone and Production Variables

Reproduction in Domestic Animals, 2016

Research paper thumbnail of Improving the reproductive efficiency by zoo-technical methods at a dairy farm

Reproduction in domestic animals = Zuchthygiene, 2006

This trial was conducted on a Hungarian dairy farm between July 2001 and December 2004. The objec... more This trial was conducted on a Hungarian dairy farm between July 2001 and December 2004. The objective of this work was to improve the reproductive efficiency with relatively high milk production. At the beginning of this trial blood and fodder samples were taken for checking the metabolic status of the animals in order to determine their health condition. The nutritive value of the daily ration for all groups met with the requirements of the Hungarian National Standard and almost all serum metabolic parameters differed between the milking and pregnant animals. Early pregnancy detection (by ultrasound) and ovulation synchronizing methods were introduced to optimize reproductive performance. The oestrus cycle was also checked by ultrasound and open cows were treated by the appropriate method in order to inseminate them as soon as possible. Efficiency of artificial insemination (AI) followed by a single prostaglandin F2alpha (PGF2alpha) and Ovsynch treatment was similar (30.8% and 29%)...

Research paper thumbnail of Intravaginal prostaglandin F2 alpha for the treatment of metritis and pyometra in the bitch

Acta veterinaria Hungarica, 1999

The purpose of this study was to determine whether intravaginal prostaglandin F2 alpha (PGF2 alph... more The purpose of this study was to determine whether intravaginal prostaglandin F2 alpha (PGF2 alpha) would be effective for the treatment of metritis or pyometra in the bitch. Seventeen bitches with metritis or pyometra were treated with PGF2 alpha. Prostaglandin F2 alpha (150 micrograms/kg body weight) was administered once or twice daily by infusing 0.3 ml per 10 kg body wt into the vaginal lumen. Bitches were also treated with amoxicillin (15 mg/kg body wt/48 h) and/or gentamicin (4 mg/kg body wt/day) administered as intramuscular (i.m.) injections. Fifteen bitches were treated successfully with intravaginally administered PGF2 alpha for 3 to 12 days and with intramuscularly administered antibiotics for 4 to 12 days. Success of treatment was judged by cessation of vaginal discharge, the absence of fluid in the uterus as determined by ultrasonography, and the overall health status of the animal. As two bitches with pyometra showed clinical deterioration in spite of medical treatmen...

Research paper thumbnail of Effect of severe energy restriction and refeeding on thyroid hormones in bulls

Acta veterinaria Hungarica, 1995

Fifty-three Holstein-Friesian breeding bulls (944.99 +/- 14.59 kg) were fasted for 4 weeks. The i... more Fifty-three Holstein-Friesian breeding bulls (944.99 +/- 14.59 kg) were fasted for 4 weeks. The influence of feeding on thyroid hormones was studied by comparing a starting point with a 4-week fasting period and a refeeding period. Blood samples were taken via a jugular vein catheter at 8:00 a.m. one day before, then once every week during, and two times after the fasting period. Plasma thyroxine (T4) and triiodothyronine (T3) levels were determined by direct radioimmuno-assay. The concentration of T4 and T3 decreased during fasting. The concentration of T3 increased after refeeding, but that of T4 did not. These data suggest that fasting is associated with a decrease in the peripheral conversion of T4 to T3 and, consequently, less T4 is converted into T3.

Research paper thumbnail of Computer analysis of video and ultrasonographic images for evaluation of bull testes

Theriogenology, 1998

The objectives of this study were to determine relationships between scrotal size (SC; estimated ... more The objectives of this study were to determine relationships between scrotal size (SC; estimated from a video image) and testicular size, and between ultrasonographic echotexture of the testis and seminiferous tubule area in bulls. Video images of the scrotum of 49 Holstein-Friesian (H-F) bulls were recorded and digitized. Scrotal width and length were measured with custom software. After slaughter, scrotums (containing testes) were excised, SC and testicular height, width and volume were measured, and the testes were examined ultrasonographically. Correlations between SC and testicular width or volume (r=0.86, P<0.001 and r=0.84, P<0.001, respectively) were much higher than those between scrotal width and testicular width or volume (I"=0.23, P<0.11 and r=0.28, P<0.06). Histological examination of the testes was performed in 31 of the bulls. Ultrasonographic echotexture of the testes (determined with custom software) was highly correlated (r~-0.5, P<0.005) with seminiferous tubule area. Although SC was superior to video imaging for estimating testicular size, ultrasonographic imaging of the testes has considerable potential for the evaluation oftesticular function in bulls.

Research paper thumbnail of Endocrine and thermal responses to GnRH treatment and prediction of sperm output and viability in Holstein-Friesian Breeding Bulls

Theriogenology, 1998

A study was conducted to determine changes in serum LH and testosterone concentrations and in scr... more A study was conducted to determine changes in serum LH and testosterone concentrations and in scrotal surface temperature (SST; measured with infrared thermography) following GnRH treatment and to predict the number of spermatozoa collected and the proportion that were viable. Holstein-Friesian breeding bulls (n = 22, average age, 24.3 m.o.; range, 15 to 41 m.o.) were examined twice 30 d apart. Concurrently, semen was collected twice weekly with an artificial vagina. Treatment with GnRH (100 micrograms, i.m.) increased (P &lt; 0.0001) serum LH and testosterone concentrations and increased (P &lt; 0.0001) SST (range 0.6 to 1.1 degrees C; P &lt; 0.05) at the top and bottom of the scrotum. In regression models to predict the total number of spermatozoa, significant independent variables included ultrasonic echotexture of the testes (negative slope), scrotal width (positive slope) and SST at the bottom of the scrotum 45 min after GnRH treatment (positive slope). In regression models to predict the percentage of live spermatozoa, ultrasonic echotexture was a significant independent variable (negative slope). Measurement of testicular ultrasonic echotexture and SST after GnRH treatment augmented measurement of testicular size for predicting the number and percentage of live spermatozoa.

Research paper thumbnail of Relationship among testosterone response to GnRH administration, testes size and sperm parameters in Holstein-Friesian bulls

Theriogenology, 1995

The investigation of the fertility capacity of A.I. bulls is one of the most important factors in... more The investigation of the fertility capacity of A.I. bulls is one of the most important factors in their genetic improvement. The aim of this study was to examine the relationship between the results of the GnRH test and the measured and calculated size of the testicles and sperm parameters (sperm density and velocity, percentage of live and motile spermatozoa). Data was collected during three experiments from a total of 81 Holstein-Friesian breeding bulls at the National Artificial Insemination Centre of Hungary. In Experiment I. a very close correlation (r=0.64, p<O.OOl ; r=0.66, p<O.OOl ; r=0.99, p<O.OOl; r=0.75, pcO.001) was found between the size of testes (weight, volume, width, length) and the calculated volume. According to the data, we may calculate volume based on the width of testicles measured by sonography.

Research paper thumbnail of Effects of GnRH treatment on scrotal surface temperatures in bulls

Canadian Journal of …, 2001

Two experiments were conducted to characterize scrotal surface temperature (SST) in bulls treated... more Two experiments were conducted to characterize scrotal surface temperature (SST) in bulls treated with gonadotropin releasing hormone (GnRH). In Experiment 1, Angus bulls (n = 10, 18 mo, 597 kg) were given GnRH (400 ng/kg) or saline, IV. Bottom SST increased approximately ...

Research paper thumbnail of Morphologic, endocrine and thermographic measurements of testicles in comparison with semen characteristics in mature Holstein–Friesian breeding bulls

Animal Reproduction Science, 1998

. Twenty Holstein-Friesian breeding bulls 62-79 months of age were examined 3 times, at Ž . 30-da... more . Twenty Holstein-Friesian breeding bulls 62-79 months of age were examined 3 times, at Ž . 30-day intervals. Scrotal thermograms for assessment of scrotal surface temperature SST and blood samples for plasma testosterone concentrations were taken just before and then 45 and 90 Ž . min, respectively, after treatment with GnRH 50 mg, Gonavet, i.m. per bull . Following GnRH Ž treatment, there generally were significant increases in mean values of both top SST range, y0.1 . Ž . to 1.48C and bottom SST range, 0.3 to 1.88C . Scrotal circumference was highly repeatable but SST and video-measurements of scrotal dimensions were less repeatable, because apparently they were affected by ambient temperature. Plasma testosterone concentrations before GnRH treatment were more repeatable than those after GnRH treatment. Correlations between examinations of 0.67 to 0.81 and y0.14 to 0.47, respectively, but the converse was true for SST measurements. Semen was collected with an artificial vagina 3 times per week for 12 weeks starting 2 weeks before the first examination. The total number of spermatozoa per ejaculate was highly repeatable and the percentage of motile and live spermatozoa were relatively consistent. Separate regressions for each variable and for each examination were conducted for these 3 semen characteristics as dependent ) Corresponding author. 0378-4320r98r$19.00 q 1998 Elsevier Science B.V. All rights reserved.

Research paper thumbnail of Comparative Study of Different Methods for Dog Semen Cryopreservation and Testing Under Clinical Conditions

Acta Veterinaria Hungarica, 2000

The extenders and freezing rates from three different freezing protocols were combined and compar... more The extenders and freezing rates from three different freezing protocols were combined and compared to each other in order to study the post-thawing acrosome integrity and fertility of frozen dog sperm. A commercial bovine TRIS-base extender (TRILADYL) and two self-made canine semen extenders (Norwegian and Dutch) were combined with a conventional bovine and two canine freezing regimes, and acrosome integrity of frozen/thawed spermatozoa was assessed by fluorescein isothiocyanate conjugated peanut agglutinin staining (FITC-PNA). Differences between freezing/thawing protocols were reflected in the proportion of cells with acrosomal damage and not based on motility results. It was concluded that during dog semen cryopreservation extenders had less influence on the post-thawing sperm quality than did the freezing rates. The optimal extender/freezing rate combination (TRILADYL/Norwegian) was used in the clinical practice to evaluate the fertility of frozen sperm administered by intraute...

Research paper thumbnail of Intravaginal Prostaglandin F 2Α for the Treatment of Metritis and Pyometra in the Bitch

Acta Veterinaria Hungarica, 1999

The purpose of this study was to determine whether intravaginal prostaglandin F2α(PGF2α) would be... more The purpose of this study was to determine whether intravaginal prostaglandin F2α(PGF2α) would be effective for the treatment of metritis or pyometra in the bitch. Seventeen bitches with metritis or pyometra were treated with PGF2α. Prostaglandin F2α(150 (g/kg body weight) was administered once or twice daily by infusing 0.3 ml per 10 kg body wt into the vaginal lumen. Bitches were also treated with amoxicillin (15 mg/kg body wt/48 h) and/or gentamicin (4 mg/kg body wt/day) administered as intramuscular (i.m.) injections. Fifteen bitches were treated successfully with intravaginally administered PGF2αfor 3 to 12 days and with intramuscularly administered antibiotics for 4 to 12 days. Success of treatment was judged by cessation of vaginal discharge, the absence of fluid in the uterus as determined by ultrasonography, and the overall health status of the animal. As two bitches with pyometra showed clinical deterioration in spite of medical treatment, ovariohysterectomy was performed ...

Research paper thumbnail of Improving reproductive performance in lactating dairy cows by synchronising ovulation or inducing oestrus

Acta Veterinaria Hungarica, 2002

Lactating crossbred Holstein-Friesian dairy cows (n = 331) were started on an Ovsynch regimen 68 ... more Lactating crossbred Holstein-Friesian dairy cows (n = 331) were started on an Ovsynch regimen 68 ± 8.2 days after calving; 200 µg GnRH intramuscularly (i.m.) on Days 0 and 9, and 35 mg prostaglandin F2a i.m. on Day 7. Thirty-eight and 31 cows (11.5 and 9.4%, respectively) were in oestrus on Days 0 to 6 and 7 to 8, respectively, and inseminated, and the remainder were fixed-time inseminated (on Day 10). For these three groups, pregnancy rates (60-65 days after breeding) were 31.6, 38.7 and 34.0%, respectively (P = 0.82) and calving rates were 100, 100 and 89.9% (P = 0.23). In a preliminary trial, twelve lactating cows (45 to 60 days postpartum) with inactive ovaries were given 1500 IU eCG i.m.; 10 were in oestrus within 10 days after treatment (and inseminated) and eight of these were pregnant (30 days after breeding). The Ovsynch program resulted in acceptable reproductive performance in cyclic cows and eCG treatment has considerable promise for inducing oestrus in anoestrous cows.

Research paper thumbnail of Factors Influencing Pregnancy Rate and Late Embryonic Loss in Dairy Cattle

Reproduction in Domestic Animals, 2007

Research paper thumbnail of Early Detection of Pregnancy and Embryonic Loss in Dairy Cattle by ELISA Tests

Reproduction in Domestic Animals, 2007

Over a 25-month period 8118 blood samples were assayed for the presence of the serum pregnancy sp... more Over a 25-month period 8118 blood samples were assayed for the presence of the serum pregnancy specific-protein B (PSPB) and progesteron (P4) concentrations on three Hungarian large-scale dairy farms. Pregnancy (n ¼ 4085) was checked by BioPRYN assay at 30-36 days post-insemination (PI).