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Pastos y Forrajes
versão On-line ISSN 2078-8452
Resumo
IGLESIAS-GOMEZ, Jesús Manuel; GARCIA-PEREZ, Luis e TORAL-PEREZ, Odalys Caridad. Carcass yield of different cattle genotypes raised under grazing conditions. Pastos y Forrajes [online]. 2019, vol.42, n.4, pp. 314-319. ISSN 2078-8452.
Objective
To compare the carcass yields of three cattle genotypes, Zebu, crossbred Holstein x Zebu and Mambí, reared together in a system of rotational grazing and moderate energy-protein supplementation.
Materials and Methods
Thirty 29-month old bulls were used. The animals were randomly distributed, at a rate of 10 per genotype. The research was conducted in a slaughterhouse of Matanzas province, Cuba. After slaughtering, the weight of the hot carcass, between three and five hours, the carcass yield percentage with regards to post-shrink live weight and boneless beef yield (bones and fat) against the final live weight of the cold carcass in percentage, were determined.
Results
The hot carcass weight significantly differed (p < 0,05) among the three genotypes (220,5; 210,0 and 188,0 kg for Zebu, Holstein x Zebu and Mambí, respectively). In the carcass yield percentage there were no significant differences, with values between 47,5 % and 48,7 %. In total beef production there were significant differences (p < 0,05) among the genotypes (128,4 kg for Zebu vs. 119,2 and 111,0 kg for Holstein x Zebu and Mambí, respectively). The boneless beef yield was higher (p < 0,05) for Mambí (60,3 %); while for Holstein x Zebu and Zebu it was 57,9 and 59,3 %, respectively. The fat and bone percentages of the three genotypes were high.
Conclusions
The carcass weight of the three genotypes (Zebu, Holstein x Zebu and Mambí), reared under grazing conditions with moderate supplementation, was directly proportional to the final live weight. However, there were no differences in yield.
Palavras-chave : fattening; beef yield; bull.