Effect of Hormonal Administration on Reproductive Development of Holstein Bull Calves and Concomitant Changes in Semen Characteristics and Seminal Plasma | ||||
Journal of Animal and Poultry Production | ||||
Article 16, Volume 11, Issue 12, December 2020, Page 605-611 PDF (836.71 K) | ||||
Document Type: Original Article | ||||
DOI: 10.21608/jappmu.2020.161227 | ||||
View on SCiNiTO | ||||
Authors | ||||
Ahmed Mohamed Shehabeldin 1; W. A. El-Hamady2; W. F. M. Fouad2; M. A. El-Hennawy2 | ||||
1Biotechnology Research Department - Animal Production Research Institute | ||||
2Animal Production Research Institute, Agricultural Research Center, Ministry of Agriculture, Egypt. | ||||
Abstract | ||||
This study aimed to determine semen quality and seminal biochemicals at 1st 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 1st 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 1st 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 1st ejaculation increased (P<0.05) by GnRH. At puberty, HDL, LDL, cholesterol, and triglycerides in GnRH; LDL, cholesterol, and triglycerides in hCG; and triglycerides in testosterone increased (P<0.05). while HDL in hCG and testosterone decreased (P<0.05). At maturity, LDL and cholesterol in hCG, and triglycerides in GnRH and hCG increased (P<0.05), while HDL decreased (P<0.05) by treatments.This study concluded that the treatment of Holstein male calves with GnRH or hCG (once/two weeks) for 10 weeks prior to puberty (8 months of age) leads to early sexual puberty-maturity ages and semen with good quality and chemical composition. | ||||
Keywords | ||||
GnRH; hCG; Testosterone; Puberty; bull | ||||
Statistics Article View: 164 PDF Download: 298 |
||||