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Papers by Ahmed Shehab El-Din

Research paper thumbnail of Effect of Different Synchronization Regimens on Follicular Wave Dynamics, Embryo Production and Cryopreservation in Cattle

Research paper thumbnail of Effect of Dietary Partial Replacement of Corn Grains by Mango Seeds on Productive and Reproductive Characterization of Damascus Goat Bucks at Prepubertal Stage

Journal of Animal and Poultry Production, 2021

This study aimed to evaluate the effect of, replacing corn grains in concentrate feed mixture (CF... more This study aimed to evaluate the effect of, replacing corn grains in concentrate feed mixture (CFM) with mango seeds (MS) in Damascus goat buck's diets, on productive and reproductive characteristics at prepubertal stage (weaning-prepuberty). Corn grains in CFM were replaced with mango seeds at levels of 0% MS (G1, control), 15% (G2) and 30% (G3). Results revealed that G3 showed the highest (P<0.05) LBW and average daily gain (ADG). Feed conversion ratio, all nutrients digestibility, feeding values, and economic feed efficiency were improved (P<0.05) in G2 and G3 compared with G1. Animals in G2 and G3 showed earlier (P<0.05) ages to produce the 1 st ejaculation than control. Testosterone concentration one-month prepuberty increased (P<0.05) in G2 compared with G1 and G3. Testicular measurements and scrotal circumference in G2 as well as only testicular length in G3 increased (P<0.05) in comparing with G1. Mediastinum width increased in G2, decreased in G3 compared with G1 (P<0.05). Tunica albuginea was thicker (P<0.05) in G2 and G3 than in G1. Scrotal septum was wider (P<0.05) in G3 than in G2. Prostate and vascular gland were longer (P<0.05) and wider in G2 and G3 than in G1. This study concluded that replacement of corn grains with mango seeds at level of 30% in diets of Damascus goat bucks has a positive effect on productive performance. The replacement at a level of 15% MS improved reproductive characterization of bucks raised for semen production for breeding programs.

Research paper thumbnail of Effect of Hormonal Administration on Reproductive Development of Holstein Bull Calves and Concomitant Changes in Semen Characteristics and Seminal Plasma

This study aimed to determine semen quality and seminal biochemicals at 1 ejaculate, puberty, and... more This study aimed to determine semen quality and seminal biochemicals at 1 ejaculate, puberty, and maturity of Holstein bulls administrated with GnRH, hCG and testosterone. Holstein male calves (n=16, 8 mo old) were divided into four groups, 4 in each. During 10-weeks interval, each animal was bi-weekly i.m injected with saline (2 ml), 2 ml GnRH, 1500 IU hCG, and 2 ml testosterone. Results indicated the earliest ages to 1 ejaculation, puberty, and maturity by hCG. Ejaculate volume was higher (P<0.05) by GnRH. Sperm motility and livability increased (P<0.05) by GnRH. Seminal total proteins (TP) and albumin (AL) decreased (P<0.05) by GnRH and hCG. Globulin (GL) and fructose decreased (P<0.05) by treatments in the 1 ejaculate. At puberty and maturity, TP, AL, and fructose increased (P<0.05) by treatments. GL increased (P<0.05) by GnRH and hCG. AL:GL increased by GnRH and testosterone at puberty, and by testosterone at maturity. Triglycerides in 1 ejaculation increased ...

Research paper thumbnail of Anti-Müllerian Hormone (Amh) as Endocrine Marker for Embryo Production in Superovulated Friesian Cows

Journal of Animal Production, 2021

The present study aimed to evaluate follicular dynamics, yield, quality and stage of embryos in s... more The present study aimed to evaluate follicular dynamics, yield, quality and stage of embryos in superovulated Friesian cows with high and low anti-Müllerian (AMH) levels. A total of 10 Friesian cows synchronized with prostaglandin F2α (PGF2α) to bring them in heat before start superovulation protocol. On day 10 post oestrus, cows were injected with 2500 IU pregnant mare serum gonadotrophin hormone (PMSG), then after 48h cow were injected with 3 ml PGF2α and with 5 ml gonadotrophin releasing hormone (GnRH) to induce ovulation on day 14. Cows were artificially inseminated twice at 12 and 24 h after GnRH. Embryos were collected after 7 days from artificial insemination (AI). To measure AMH concentration, 1 blood sample was collected at the beginning of second follicular wave according to ultrasonography. Results showed that numbers of antral follicles and total follicles were significantly greater in high AMH level than in low AMH level donors. Differences in CL numbers of cows in high...

Research paper thumbnail of Effect of Different Synchronization Regimens on Follicular Wave Dynamics, Embryo Production and Cryopreservation in Cattle

Research paper thumbnail of Effect of Dietary Partial Replacement of Corn Grains by Mango Seeds on Productive and Reproductive Characterization of Damascus Goat Bucks at Prepubertal Stage

Journal of Animal and Poultry Production, 2021

This study aimed to evaluate the effect of, replacing corn grains in concentrate feed mixture (CF... more This study aimed to evaluate the effect of, replacing corn grains in concentrate feed mixture (CFM) with mango seeds (MS) in Damascus goat buck's diets, on productive and reproductive characteristics at prepubertal stage (weaning-prepuberty). Corn grains in CFM were replaced with mango seeds at levels of 0% MS (G1, control), 15% (G2) and 30% (G3). Results revealed that G3 showed the highest (P<0.05) LBW and average daily gain (ADG). Feed conversion ratio, all nutrients digestibility, feeding values, and economic feed efficiency were improved (P<0.05) in G2 and G3 compared with G1. Animals in G2 and G3 showed earlier (P<0.05) ages to produce the 1 st ejaculation than control. Testosterone concentration one-month prepuberty increased (P<0.05) in G2 compared with G1 and G3. Testicular measurements and scrotal circumference in G2 as well as only testicular length in G3 increased (P<0.05) in comparing with G1. Mediastinum width increased in G2, decreased in G3 compared with G1 (P<0.05). Tunica albuginea was thicker (P<0.05) in G2 and G3 than in G1. Scrotal septum was wider (P<0.05) in G3 than in G2. Prostate and vascular gland were longer (P<0.05) and wider in G2 and G3 than in G1. This study concluded that replacement of corn grains with mango seeds at level of 30% in diets of Damascus goat bucks has a positive effect on productive performance. The replacement at a level of 15% MS improved reproductive characterization of bucks raised for semen production for breeding programs.

Research paper thumbnail of Effect of Hormonal Administration on Reproductive Development of Holstein Bull Calves and Concomitant Changes in Semen Characteristics and Seminal Plasma

This study aimed to determine semen quality and seminal biochemicals at 1 ejaculate, puberty, and... more This study aimed to determine semen quality and seminal biochemicals at 1 ejaculate, puberty, and maturity of Holstein bulls administrated with GnRH, hCG and testosterone. Holstein male calves (n=16, 8 mo old) were divided into four groups, 4 in each. During 10-weeks interval, each animal was bi-weekly i.m injected with saline (2 ml), 2 ml GnRH, 1500 IU hCG, and 2 ml testosterone. Results indicated the earliest ages to 1 ejaculation, puberty, and maturity by hCG. Ejaculate volume was higher (P<0.05) by GnRH. Sperm motility and livability increased (P<0.05) by GnRH. Seminal total proteins (TP) and albumin (AL) decreased (P<0.05) by GnRH and hCG. Globulin (GL) and fructose decreased (P<0.05) by treatments in the 1 ejaculate. At puberty and maturity, TP, AL, and fructose increased (P<0.05) by treatments. GL increased (P<0.05) by GnRH and hCG. AL:GL increased by GnRH and testosterone at puberty, and by testosterone at maturity. Triglycerides in 1 ejaculation increased ...

Research paper thumbnail of Anti-Müllerian Hormone (Amh) as Endocrine Marker for Embryo Production in Superovulated Friesian Cows

Journal of Animal Production, 2021

The present study aimed to evaluate follicular dynamics, yield, quality and stage of embryos in s... more The present study aimed to evaluate follicular dynamics, yield, quality and stage of embryos in superovulated Friesian cows with high and low anti-Müllerian (AMH) levels. A total of 10 Friesian cows synchronized with prostaglandin F2α (PGF2α) to bring them in heat before start superovulation protocol. On day 10 post oestrus, cows were injected with 2500 IU pregnant mare serum gonadotrophin hormone (PMSG), then after 48h cow were injected with 3 ml PGF2α and with 5 ml gonadotrophin releasing hormone (GnRH) to induce ovulation on day 14. Cows were artificially inseminated twice at 12 and 24 h after GnRH. Embryos were collected after 7 days from artificial insemination (AI). To measure AMH concentration, 1 blood sample was collected at the beginning of second follicular wave according to ultrasonography. Results showed that numbers of antral follicles and total follicles were significantly greater in high AMH level than in low AMH level donors. Differences in CL numbers of cows in high...