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Effect of dietetic protein level for bull fattening with high molasses levels 1. weight gain consumption and feed conversion



Effect of dietetic protein level for bull fattening with high molasses levels 1. weight gain consumption and feed conversion



Indian Journal of Animal Sciences 49(12): 992-1000



Thirty-six F1 Holstein .times. Brahman and 36 Charolais .times. Brahman bulls were employed in a 3 .times. 2 factorial design to study the effect of 3 levels of protein (80, 100 and 120% of the NRC [National Research Council], 1970, requirements) on the performance of animals fattened with high levels of final molasses. The cross-bred Charolais showed better molasses and metabolizable energy conversions than cross-bred Holstein during the feeding period. The increase of protein level improved wt gains in a linear form for Charolais and in a quadratic form for Holstein. Energy and protein conversions improved as the level of protein increased during the 180-300 kg live wt stage. However, the effect was negative when the period between 300 kg live wt and slaughter wt was considered. Relationships between protein consumption and the different performance aspects were found. No more than 800-850 g of protein/day should be used under molasses fattening conditions to guarantee an adequate growth rate without affecting protein conversion.

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Accession: 005233284

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