Effect of vaccination against gonadotropin-releasing factor (GnRF) with Bopriva® in the prepubertal bull calf

The aim of this study was to evaluate the effect of immunization against gonadotropin-releasing factor (GnRF) with Bopriva® (Pfizer Animal Health, Parkville, Australia) in prepubertal bull calves. For the study, 6 calves were vaccinated at the age of 3 and 6 weeks with 1mL Bopriva®, and 6 animals se...

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Veröffentlicht in:	Animal reproduction science 2012-03, Vol.131 (1-2), p.72-80
Hauptverfasser:	Janett, F, Gerig, T, Tschuor, A.C, Amatayakul-Chantler, S, Walker, J, Howard, R, Piechotta, M, Bollwein, H, Hartnack, S, Thun, R
Format:	Artikel
Sprache:	eng
Schlagworte:	animal health Animals antibodies Body Weight bulls Calf calves Castration Cattle - immunology GnRF GnRH Gonadotropin-Releasing Hormone - antagonists & inhibitors Gonadotropin-Releasing Hormone - immunology luteinizing hormone Luteinizing Hormone - blood Male Organ Size Puberty Random Allocation Scrotum - immunology secretion Sexual Maturation - physiology slaughter spermatozoa Statistics, Nonparametric testes Testis - immunology testosterone Testosterone - blood vaccination Vaccination - methods Vaccination - veterinary Vaccine weight gain
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Beschreibung
Zusammenfassung:	The aim of this study was to evaluate the effect of immunization against gonadotropin-releasing factor (GnRF) with Bopriva® (Pfizer Animal Health, Parkville, Australia) in prepubertal bull calves. For the study, 6 calves were vaccinated at the age of 3 and 6 weeks with 1mL Bopriva®, and 6 animals served as matched controls. Concentrations of GnRF antibodies, testosterone and LH were determined in serum samples out to 30 weeks after the first immunization. Body weight and scrotal circumference were measured for 59 weeks. At slaughter, 65 weeks after the first immunization, the quality of epididymal sperm was evaluated. The results showed that vaccination against GnRF influenced (P
ISSN:	0378-4320 1873-2232
DOI:	10.1016/j.anireprosci.2012.02.012