Aggressive behavior is reduced in bulls actively immunized against gonadotropin-releasing hormone1

摘要: The purpose of this research was to compare the frequency aggressive behavior's in beef bulls actively immunized against gonadotropin-releasing hormone relative contemporary nonimmunized control and surgically castrated steers. Eight males were assigned each ofthese treatments 4 yr. Immunized treated with a GnRH-keyhole-limpet hemocyanin (KLH) conjugate at approximately mo age. A secondary (booster) immunization administered 12 mo. Steers Animals treatment year housed as single group prior testing. At 16 age, eight animals placed 10- x 16-m enclosure for 20 min on five occasions 2 3 d intervals. An observer recorded butts initiated by animal well participation bouts sparring. Relative bulls, immunocastration reduced (P 0.05). These observations indicate that active GnRH reduces incidence behavior male cattle are consistent our postulate immunoneutralization is an effective alternative surgical castration management cattle.