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PHENOTYPIC EVALUATION OF FEED AND PRODUCTIVE EFFICIENCY, AND METABOLIC PROFILE OF NELLORE COWS

Abstract

The evaluation of phenotypic variation of feed efficiency in beef cows is essential to increase the knowledge of the impact of more efficient animal on reproduction and productivity of the cow herd. The objective of this project is to quantify the phenotypic variation in feed efficiency traits of cows during lactation in order to elucidate the effect of residual feed intake (RFI) class on production and reproduction traits. Sixty Nelore heifers (30 per year) will be assessed during the first production (up to weaning of the first calf), for determining feed efficiency (RFIC-100 and RFI100-200) and associations with the skeletal size, body composition (obtained by ultrasound), feeding behavior (recorded by the intelligent feeder system), skin surface temperature (obtained by infrared thermography), production (weight-suckle-weight technique) and composition of milk (fat, protein and lactose), and calf growth in the pre-weaning period, and endocrine, energy, protein and mineral metabolism through metabolic indicators. Cows will remain for 228 days (28 days adaptation + 200 days birth to weaning) on paddock equipped with intelligent feeder banks (Intergado, Contagem, Minas Gerais, Brazil) for the assessment of dry matter intake (in 200 days after calving), and other variables. The association between genomic breeding value of RFI obtained in the post-weaning phase (RFIyear) and RFIC-100 and RFI100-200 will also be determined. Moreover, with the historical database, the relationship between feed efficiency (RFIYEAR) and subsequent reproductive efficiency will be evaluate, through comparisons of means and by estimating phenotypic and genetic correlations between RFIYEAR and reproductive traits (days to calving and scrotal circumference of males). The results will be important to promote the evaluation, selection and use of more efficient animals for meat production. (AU)

Scientific publications (4)
(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)
LUANA LELIS SOUZA; FLÁVIA CRISTINA BIS; LEANDRO SANNOMIYA SAKAMOTO; DANIELLY FERNANDA BROLEZE; CAMILA DELVEAUX ARAÚJO BATALHA; MARIA EUGÊNIA ZERLOTTI MERCADANTE. Residual feed intake of Nellore calves is not repeatable across pre and post weaning periods. Ciência Rural, v. 51, n. 6, p. -, 2021. Web of Science Citations: 0.
BROLEZE, DANIELLY FERNANDA; SOUZA, LUANA LELIS; ZORZETTO, MARIANA FURTADO; SAVEGNAGO, RODRIGO PELICIONI; NEGRAO, JOAO ALBERTO; BONILHA, SARAH FIGUEIREDO MARTINS; MERCADANTE, MARIA EUGENIA ZERLOTTI. Feed efficiency and maternal productivity of Bos indicus beef cows. PLoS One, v. 15, n. 6 JUN 3 2020. Web of Science Citations: 0.
SOUZA, LUANA LELIS; ZORZETTO, MARIANA FURTADO; TERRA RICCI, TULIO JOSE; CANESIN, ROBERTA CARRILHO; DIAS E SILVA, NHAYANDRA CHRISTINA; NEGRAO, JOAO ALBERTO; DOS SANTOS GONCALVES CYRILLO, JOSLAINE NOELY; ZERLOTTI MERCADANTE, MARIA EUGENIA. Relationship between performance, metabolic profile, and feed efficiency of lactating beef cows. TROPICAL ANIMAL HEALTH AND PRODUCTION, v. 51, n. 7, p. 2045-2055, SEP 2019. Web of Science Citations: 0.
FERREIRA JUNIOR, RUBENS J.; BONILHA, SARAH F. M.; MONTEIRO, FABIO M.; CYRILLO, JOSLAINE N. S. G.; BRANCO, RENATA H.; SILVA, JOSINEUDSON A. I. I. V.; MERCADANTE, MARIA EUGENIA Z. Evidence of negative relationship between female fertility and feed efficiency in Nellore cattle. JOURNAL OF ANIMAL SCIENCE, v. 96, n. 10, p. 4035-4044, OCT 2018. Web of Science Citations: 0.

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