| Autor: |
Nascimento KB; Department of Animal Science, Universidade Federal de Lavras, Lavras 37200-900, MG, Brazil., Galvão MC; Department of Animal Science, Universidade Federal de Lavras, Lavras 37200-900, MG, Brazil., Meneses JAM; Department of Animal Science, Universidade Federal de Lavras, Lavras 37200-900, MG, Brazil.; Department of Veterinary Medicine and Animal Science, Universidad de Ciencias Aplicadas y Ambientales, Cartagena 130001, Bolivar, Colombia., Moreira GM; Department of Animal Science, Universidade Federal de Lavras, Lavras 37200-900, MG, Brazil.; Timac Agro Brazil, Ribeirão Preto 14026-282, SP, Brazil., Ramírez-Zamudio GD; Department of Animal Science, Universidade Federal de Lavras, Lavras 37200-900, MG, Brazil., Souza SP; Department of Animal Science, Universidade Federal de Lavras, Lavras 37200-900, MG, Brazil., Prezotto LD; Department of Research Centers, Montana State University, Bozeman, MT 59501, USA., Chalfun LHL; Department of Veterinary Medicine, Centro Universitário de Lavras, Lavras 37203-593, MG, Brazil., Duarte MS; Department of Animal Bioscience, University of Guelph, Guelph, ON N1G 2W1, Canada., Casagrande DR; Department of Animal Science, Universidade Federal de Lavras, Lavras 37200-900, MG, Brazil., Gionbelli MP; Department of Animal Science, Universidade Federal de Lavras, Lavras 37200-900, MG, Brazil. |
| Abstrakt: |
This study aimed to assess the effects of maternal protein supplementation and offspring sex (OS) on the intake parameters of the offspring. Forty-three Tabapuã cows were randomly allocated in the following treatments: protein supplementation (PS) during days 100-200 of gestation (RES, 5.5% total crude protein (CP), n = 2, or CON, 10% total CP, n = 19) and OS (females, n = 20; males, n = 23). The offspring were evaluated during the cow-calf (0-210 days), backgrounding (255-320 days), growing 1 (321-381 days), and growing 2 (382-445 days) phases. The CON offspring tended to present higher dry matter intake (DMI) at weaning ( p = 0.06). The CON males presented lower digestibility of major diet components in the growing 2 phase ( p ≤ 0.02). The CON offspring spent 52% more time per day eating supplements at 100 days and 17% less time in idleness at 210 days. The CON males spent 15 min more per day ruminating than RES males in the feedlot phase ( p = 0.01). We concluded that protein supplementation over gestation alters the offspring feed intake pattern as a whole, while protein restriction promotes compensatory responses on nutrient digestibility in males. |
