Please use this identifier to cite or link to this item: http://repositorio.ufla.br/jspui/handle/1/50022
Title: Nutritional performance and metabolic characteristics of cattle fed tropical forages with protein and starch supplementation
Keywords: Brachiaria decumbens
Digestibility
Fiber
IGF-1
Low-quality hay
Nitrogen balance
Plantas forrageiras tropicais
Nutrição animal
Bovinos - Digestibilidade
Fibras
Feno de baixa qualidade
Balanço nitrogenado
Issue Date: Feb-2021
Publisher: Academia Brasileira de Ciências
Citation: FRANCO, M. O. et al. Nutritional performance and metabolic characteristics of cattle fed tropical forages with protein and starch supplementation. Anais da Academia Brasileira de Ciências, Rio de Janeiro, v. 93, n. 3, e20190487, 2021. DOI: 10.1590/0001-3765202120190487.
Abstract: Effects of protein supplementation, with and without starch supplementation, on nutritional performance and metabolic characteristics of cattle fed low- and medium-quality tropical forages were evaluated using 4 cannulated steers distributed according to a 4 × 4 Latin square. Experimental periods were divided into two subperiods. In the first subperiod, two animals received low-quality hay and two animals received medium-quality. Supplementation schemes were evaluated in the second subperiod: low-quality hay with protein (300 g of crude protein – CP/d); low-quality hay with protein (300 g CP/d) and starch (225 g/d); medium-quality hay with protein (300 g CP/d); and medium-quality hay with protein (300 g CP/d) and starch (225 g/d) supplementation. Without supplementation, medium-quality forage provided higher intake, digestibility, nitrogen balance (NB) and efficiency of nitrogen utilization (EFNU). Comparing subperiods, supply of supplements depressed medium-quality forage intake, but did not affect low-quality forage intake. Supplementation increased NB, EFNU and serum concentration of IGF1 in animals fed low-quality forage. Protein supplementation increases nitrogen retention in animals, an effect attributed mainly to anabolic stimuli. However, this effect is more prominent when animals are fed low-quality forages. No positive impact on animal metabolism was obtained with combination of supplemental protein and starch.
URI: http://repositorio.ufla.br/jspui/handle/1/50022
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