Effects on performance and meat quality of Holstein bulls fed high concentrate diets without implants following immunological castration

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• 作者：S. Marti^a ; J.A. Jackson^b ; N. Slootmans^c ; E. Lopez^d ; A. Hodge^d ; M. Pé ; rez-Juan^e ; M. Devant^a ; ^{maria.devant@irta.cat} ; S. Amatayakul-Chantler^d
• 关键词：Immunocastration ; Performance ; Meat quality ; Beef
• 刊名：Meat Science
• 出版年：2017
• 出版时间：April 2017
• 年：2017
• 卷：126
• 期：Complete
• 页码：36-42
• 全文大小：358 K
• 卷排序：126

文摘

The objective of this study was to evaluate the effect of the GnRH vaccine on the performance and meat quality of Holstein bulls fed high concentrate diets. A total of 493 approximately 7 month old bulls (initial BW 298 ± 1.2 kg) were allocated into 3 treatment groups, intact bulls (n = 164), animals surgically castrated at 15 to 17 d of the study (n = 164), and animals vaccinated on 0 and 28 d of the study with the GnRH vaccine (n = 165). Animals were slaughtered between 131 and 133 d and carcass quality was evaluated. Hot carcass weight, dressing percentage, fat classification and meat quality parameters did not differ significantly between surgically castrated and vaccinated animals but differed (P < 0.05) from intact bulls. Carcass classification, pH at 26 h, and fat color were not affected by treatment.