Effect of immunocastration with Bopriva on carcass characteristics and meat quality of feedlot Holstein bulls.
To evaluate the effect of immunocastration on carcass and meat characteristics, Holstein bulls aged between 7 and 8months with a live weight of 232±1.19kg were given two separate treatments, placebo (intact bulls) versus Bopriva, and then slaughtered after approximately 239days of fattening. While the testosterone levels in intact bulls remained at 0.42ng/ml throughout the study, by day 181, differences (P<0.05) were observed in immunized bulls, with values of 0.21ng/ml. The carcasses of animals treated with Bopriva recorded both a higher hot carcass weight (HCW) and a cold carcass weight (CCW), as well as higher dorsal fat density, marbling and KPH (P<0.05); however, no differences (P>0.05) were observed in the Longissimus lumborum area. No significant differences (P>0.05) were recorded between the treatments for pH, L*, a*, b* C* and H*. The carcasses of the animals treated with Bopriva were heavier, with higher dorsal fat density and marbling score.
Instituto de Investigaciones en Ciencias Veterinarias, Universidad Autónoma de Baja California, A. Obregón y J. Carrillo s/n Col. Nueva, Mexicali, Baja California CP. 21100, Mexico.
C
C
Pérez-Linares
Instituto de Investigaciones en Ciencias Veterinarias, Universidad Autónoma de Baja California, A. Obregón y J. Carrillo s/n Col. Nueva, Mexicali, Baja California CP. 21100, Mexico.
L
L
Bolado-Sarabia
Instituto de Investigaciones en Ciencias Veterinarias, Universidad Autónoma de Baja California, A. Obregón y J. Carrillo s/n Col. Nueva, Mexicali, Baja California CP. 21100, Mexico. Electronic address: fernando_figueroa@uabc.edu.mx.
F
F
Figueroa-Saavedra
Instituto de Investigaciones en Ciencias Veterinarias, Universidad Autónoma de Baja California, A. Obregón y J. Carrillo s/n Col. Nueva, Mexicali, Baja California CP. 21100, Mexico.
A
A
Barreras-Serrano
Instituto de Investigaciones en Ciencias Veterinarias, Universidad Autónoma de Baja California, A. Obregón y J. Carrillo s/n Col. Nueva, Mexicali, Baja California CP. 21100, Mexico.
E
E
Sánchez-López
Instituto de Investigaciones en Ciencias Veterinarias, Universidad Autónoma de Baja California, A. Obregón y J. Carrillo s/n Col. Nueva, Mexicali, Baja California CP. 21100, Mexico.
A R
AR
Tamayo-Sosa
Instituto de Investigaciones en Ciencias Veterinarias, Universidad Autónoma de Baja California, A. Obregón y J. Carrillo s/n Col. Nueva, Mexicali, Baja California CP. 21100, Mexico.
A A
AA
Godina
Facultad de Medicina Veterinaria y Zootecnia, Universidad Autónoma de Sinaloa, Blvd. San Ángel s/n predio Las Coloradas, CP. 80326 Culiacán, Sinaloa, Mexico.
F
F
Ríos-Rincón
Ganadera Mexicali, S.A. de C.V., kilómetro 3.5 carretera a San Luis S/N, Ejido Pólvora, Mexicali, Baja California, Mexico.
L A
LA
García
Laboratorio Zoetis, S.A. Paseo de los Tamarindos #60, Col. Bosques de las Lomas, Del. Cuajimalpa, Ciudad de México CP. 05120, Mexico.
E
E
Gallegos
D000818:Animals; D000831:Animals, Newborn; D002369:Castration / Q000379:methods*; D002417:Cattle / Q000276:immunology; D003116:Color; D063427:Food Quality; D006863:Hydrogen-Ion Concentration; D007114:Immunization / Q000662:veterinary*; D008297:Male; D018482:Muscle, Skeletal / Q000737:chemistry; D000069466:Red Meat / Q000032:analysis*; D013739:Testosterone / Q000097:blood; D022642:Vaccines, Contraceptive / Q000008:administration & dosage*
D022642:Vaccines, Contraceptive; D013739:Testosterone
Carcass; Immunocastration; Meat quality; Testosterone