Effects of season on semen parameters and relationships between selected semen characteristics in Hypor boars (original) (raw)
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The main objective of this study was to assess the phenotypic variability of the ejaculate volume (VOL) and progressive sperm motility (MO) under the influence of breed, boar within breed and season. The study included 555 ejaculates of Danish Landrace (DL), Danish Large White (DLW) and Danish Duroc (DD) boars. The effect of boar was analyzed within the investigated breeds. The impact of the season was investigated as the influence of the month in which the ejaculate was taken. The model included a linear regression effect of boar age when the semen was taken. Data analysis was performed using the statistical package SAS 9.1.3 (SAS Inst. Inc.., 2002-2003). Impact assessment was carried out using the GLM procedure. The impact of all factors analyzed in both sperm traits was significant to highly significant, and the observed factors largely explain the phenotypic variability VOL compared to MO. The highest values were found in VOL of DL boar (3:58 ? 164.96 ml), and the MO of boar bre...
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In a tropical environment, sow productivity is strongly associated with boar sperm production. Regular monitoring of semen quality in boars that produce semen for artificial insemination is important. The objective of the present study was to investigate the boar sperm production in an evaporative cooling system in a tropical environment in association with breed and season. A total of 2878 ejaculates from 68 boars were collected from a boar stud in the western region of Thailand. The breeds consisted of 22 Duroc, 22 Yorkshire, 18 Landrace and six hybrid boars. Seasons were classified as cool, hot or rainy. Semen volume, sperm concentration, total sperm production and extended semen doses per ejaculate were evaluated. The data were analysed by a general linear mixed model procedure. On average, the semen volume, sperm concentration, total sperm production and extended semen doses per ejaculate were 256.2 ± 95.1 mL, 294.6 ± 125.0 × 10 6 sperm/mL, 70.2 ± 28.9 × 10 9 sperm/ejaculate and 16.2 ± 5.8 doses/ejaculate, respectively. In Duroc boars, the semen volume, total sperm production and extended semen doses per ejaculate in the cool season were higher than in the hot and rainy seasons (P < 0.05). However, most semen production traits did not differ significantly among season in Landrace, Yorkshire and hybrid boars. In conclusion, seasons influenced the semen traits of Duroc boars kept in an evaporative cooling system in Thailand.
The Dynamic of Main Indices of Spermiogram at Boars, in Function on Some Factors of Influence
Breeding boars used for semen production. This is conditioned by many factors. The research aim was to assess the some indices of spermogram (volume, mobility, concentration, total sperm / ejaculate) at 21 boars, the breeds Large White, Landrace, Duroc and Pietrain in relation with some factors of influence: the race, age, individual and harvesting season. The age of boars was between 8 months and 30 months. The rhythm of harvesting was following: one harvesting followed by the five days break. Depending on the breed, were differences for volume (183,5± 4,88 ml at Pietrain boars and 256±5,3 ml at Landrace boars) and for concentration (309,7±6,0 millions/ml at Duroc boars and 430,7±9,3 millions/ml at Pietrain boars). In function on the season, semen volume varied insignificant between summer (minimum values: 188.4 ± 5.6 ml) and winter (maximum values: 222.1 ± 6.6 ml). The spermatozoon concentration was insignificantly influenced by the season (371.6 ± 11.7 million/ml -summer; 399.4 ±...
Effect of Season on Boar Semen Quality
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It was demonstrated that boar sperm production and characteristics significantly decrease in the wormer period of the year. As a result, the boars reproductive exploitation efficiency decrease in the wormer seasone. Therefore, the aim of the present paper was to investigate the influence of coold and warm seasone on the boars semen quality, in the our intensive pig production conditions. The obtained results clearly show that the main semen quality parameters were significantly (p<0.05 or p<0.01) higher in the cold, compared with the warm season (ejaculate volume=274ml, sperm concentration=229×10 6 /ml, total sperm number=60×10 9 , progressive motility=79%, and good ejaculates=96%, vs. 218ml, 208×10 6 /ml, 45×10 9 , 69% and 78%, resp.). In conclusion, keeping boars cool during summer and frequent observation of boars to determine if they are being heatstressed, can significant reduce the negative influence of elevated ambient temperature on sperm production and, consequently, improve boars reproductive exploitation efficiency.
Natural Mediterranean photoperiod does not affect the main parameters of boar-semen quality analysis
Theriogenology, 2005
Photoperiod is an important factor in the modulation of male reproduction in mammals. In boars, however, it is a controversial factor. The main aim of this work is to determine the precise effect of the natural, Mediterranean photoperiod on boar-semen quality. To do this, boars were housekept in strictly controlled temperature and humidity conditions, whereas light periods were also strictly adjusted to obtain a light-cycle in the farm. The work was performed over a period of one year, thus allowing for the determination of the putative yearly oscillations of boar-semen quality. Variations of the natural Mediterranean photoperiod do not induce substantial changes in overall semen-quality parameters like the percentages of viability, morphological abnormalities and total motility, the response to the osmotic resistance test and sperm motion characteristics. Only the motile-sperm subpopulation structure was significantly (P < 0.05) changed depending on the variations of the natural photoperiod. Furthermore, the boar-semen ability for storage at 15-17 8C in a commercial extender was not modified by photoperiod changes. Our results indicate that the natural Mediterranean photoperiod does not induce strong changes in boar-M.M. Rivera et al. / Theriogenology xxx (2005) xxx-xxx
Journal of Veterinary Medical Science, 2005
The aim of this study was to investigate the effect of season, temperature, humidity, age of the boar, and semen collection interval on sperm morphology in Duroc boars in Thailand, kept either in a conventional open air system (CONV) or in an evaporative cooling system (EVAP). In total, 1176 ejaculates from 110 sexually mature boars in six CONV herds and five EVAP herds were morphologically examined during a one-year period. Analysis of variance was applied to the data. Minor differences in the sperm morphology traits analyzed were found between the housing systems. There was a significant seasonal effect (two-month periods) on the percentage of morphologically normal spermatozoa (normal1), morphologically normal spermatozoa including spermatozoa with distal cytoplasmic droplets (normal2), proximal cytoplasmic droplets (prox), and sperm head abnormalities (P≤0.001). Temperature had a significant effect on normal1 in the CONV system (P≤0.01) and in the EVAP system (P≤0.05), and on normal2 (P≤0.05) and prox (P≤0.001) in both systems. Humidity had a significant effect on prox (P≤0.05) in the EVAP system. The results also indicate that the sperm morphology traits were mildly affected by the housing systems investigated. A seasonal variation in sperm morphology was found, and high temperatures and high humidity had negative effects on sperm morphology.