Burdizzo Pre-pubertal Castration Effects On Performance, Behaviour, Carcass Characteristics, And Meat Quality Of Holstein Bulls Fed High-concentrate Diets

摘要

The effects of Burdizzo pre-pubertal castration on performance, behaviour, carcass, and meat quality of Holstein bulls fed high-concentrate diets were evaluated. Two hundred bulls (8.0 ± 0.42 months old) were randomly assigned to control (CTR) or Burdizzo castration (BURD). After 121 d, ADG, BW, and HCW were greater in CTR animals than in BURD animals, as well as, the agonistic and sexual behaviour. However, carcass fatness and intramuscular LT (longissimus thoracis) fat percentage were greater in BURD animals than in CTR animals. Additionally, CTR animals showed lower L~*, a~*, and b~* than BURD. The WBSF was smaller (P ＜ 0.01) in BURD than in CTR bulls at all ageing days, and in both treatments decreased (P ＜ 0.01) from 0 to 7 d of ageing. Additionally, at day 0 of ageing, meat from BURD animals showed similar WBSF to meat from CTR bulls after 7 d of ageing. However, 23% of BURD animals did not have a complete testicular atrophy, suggesting that the method of castration was not completely effective.