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Carcass characteristic of dairy bull calves fed different energy sources.

E. R. Q. Vieira



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Carcass characteristic of dairy bull calves fed different energy sources.
E. R. Q. Vieira*1, D. O. Cutrim2, F. G. F. Castro3, J. N. M. Neiva1, H. P. S. L. Rocha4, R. A. Oliveira1. 1Universidade Federal do Tocantins Aragua�na, Tocantins, Brazil, 2Instituto Federal do Tocantins Pedro Afonso, Tocantins, Brazil, 3Agrocria Animal Nutrition and Seeds Goi�nia, Goi�s, Brazil, 4Universidade Federal de Goi�s Goi�nia, Goi�s, Brazil.

The objective of this study was to evaluate different energy sources on quantitative carcass characteristics of confined dairy bull calves. Twenty-five, 2 mo old, Holstein x Zebu crossbred bull calves (mean BW 55.12 � 2.2 kg) were slaughtered at 10 mo of age. Four experimental diets were used, a corn diet(whole grain corn plus pellet core), babassu mesocarp meal (BMM) diet (corn diet with 100.0 g/kg of BMM) millet diet (corn diet including 316.8 g/kg millet) and sorghum diet (corn diet including 316.8 g/kg whole grain sorghum). The animals were housed in individual pens and were randomly assigned to 1 of 4 treatments. The BMM diet provided lower (P < 0.05) consumption of DM, CP, NFC than the other diets, which did not differ from each other. The animals fed with the corn and sorghum diets had greater (P < 0.05) empty BW, and hot and cold carcass weights in relation to those fed the BMM diet, while the calves fed the millet diet did not differ in relation to the others. The animals fed with the millet diet showed lower (P < 0.05) hot carcass yield (50.2 kg/100 kg BW) and cold carcass yield (48.5kg/100 kg BW) compared with those submitted to the others diets. The content of the gastrointestinal tract was higher (P < 0.001) for those who received the diet containing millet and sorghum in relation to the diet containing BMM, while those fed the corn diet did not differ from the others. The inclusion of millet or sorghum in the form of whole grain as a source of starch in the diet for ruminants, provides carcass characteristics of the animals similar to the whole grain corn diet. The inclusion of BMM in an exclusive diet of whole grain corn reduces the development of animals and produces lighter and smaller carcasses.

Keywords: alternative feed, concentrate, ruminant.