Performance and carcass characteristics of immunocastrated, surgically castrated and non-castrated cattle
DOI:
https://doi.org/10.17523/bia.2023.v80.e1512Keywords:
Sexual dimorphism, Fattening, Subcutaneous fat thickness, Weight gain, Finishing gradeAbstract
The objective was to evaluate the performance and carcass characteristics of immunocastrated cattle, compared to castrated and non-castrated cattle, supplemented in pasture. Thirty-six cattle were used, distributed in an entirely randomized design, in three treatments: non-castrated animals (ANC), animals castrated later by surgical method (ACC) and immunocastrated animals (AIC), with 12 repetitions each. The immunocastration was performed following the protocol of two doses of the immunocastration vaccine, with an interval of 60 days, promoting a castration effect of 120 days. The animals were kept in mixed pasture in a rotational system, receiving high performance mineral supplementation in the first 3 months and specific feed for the fattening season in the following 3 months, following the standard of the property. The total experimental period was 180 days. The data were submitted to normality test, variance analysis, and comparison of means by Tukey's test at 5%. The average daily weight and total weight gains, hot and cold carcass weights and hot and cold carcass yields did not show statistical differences (P>0.05) for animals submitted to different treatments. However, the cooling loss was lower in immunocastrated animals (P<0.05), followed by surgically castrated and non-castrated animals. Immunocastrated and surgically castrated animals had higher carcass finish (P<0.05) than uncastrated animals. The initial carcass temperature was lower (P<0.05) in the immunocastrated group but the final temperature did not present statistical differences (P>0.05) for animals submitted to different treatments. The final pH of the carcass was higher (P<0.05) in immunocastrated animals than in the surgically castrated ones, but did not differ (P>0.05) from the non-castrated ones. Immunocastrated animals, in a pasture system receiving supplementation, presented similar weight and carcass weight gains compared to non-castrated and surgically castrated animals, however, with lower carcass cooling losses.
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