Rendimiento en canal de diferentes genotipos bovinos criados a pastoreo.

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. [ABSTRACT FROM AUTHOR]