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Feed efficiency of pregnant Nellore cows and potential of body tissues development of their progenies


The phenotypic evaluation of feed efficiency variation in beef cows is essential to increase the knowledge about the impact of more efficient animals use on beef productivity. The present project will be developed with the objective of identifying and quantifying the phenotypic variation of feed efficiency traits in pregnant Nellore cows in order to elucidate the effect of the residual feed intake class to which they belong in the production traits of their calf crops. Sixty Nellore heifers will be evaluated during the first and second pregnancy (until weaning of the second calf), to determine the associations between feed efficiency and skeletal size, body composition (obtained by ultrasonography), calf growth until weaning, and endocrine, energy, protein and mineral metabolism analysing metabolic indicators. The results generated with the development of the project will be important to promote the evaluation, selection and use of animals with higher feed efficiency for meat production. (AU)

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(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)
TREVIZAN, N.; CANESIN, R. C.; BRANCO, R. H.; BATALHA, C. D. A.; CYRILLO, J. N. S. G.; BONILHA, S. F. M.. Growth, ruminal and metabolic parameters and feeding behavior of Nellore cattle with different residual feed intake phenotypes. LIVESTOCK SCIENCE, v. 244, . (17/06709-2, 17/50339-5)
ARAUJO BATALHA, CAMILA DELVEAUX; MORELLI, MARCELA; BRANCO, RENATA HELENA; DOS SANTOS GONCALVES CYRILLO, JOSLAINE NOELY; CANESIN, ROBERTA CARRILHO; ZERLOTTI MERCADANTE, MARIA EUGENIA; MARTINS BONILHA, SARAH FIGUEIREDO. Association between residual feed intake, digestion, ingestive behavior, enteric methane emission and nitrogen metabolism in Nellore beef cattle. ANIMAL SCIENCE JOURNAL, v. 91, n. 1, . (18/20080-2, 17/06709-2, 17/50339-5)
ARAUJO BATALHA, CAMILA DELVEAUX; TEDESCHI, LUIS ORLINDO; DE ARAUJO, FABIANA LANA; BRANCO, RENATA HELENA; DOS SANTOS GONCALVES CYRILLO, JOSLAINE NOELY; MARTINS BONILHA, SARAH FIGUEIREDO. Animals selected for postweaning weight gain rate have similar maintenance energy requirements regardless of their residual feed intake classification. JOURNAL OF ANIMAL SCIENCE, v. 99, n. 3, . (17/50339-5, 19/17714-2, 17/06709-2)

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