Use este identificador para citar ou linkar para este item: https://locus.ufv.br//handle/123456789/16396
Tipo: Artigo
Título: Energetic-protein supplementation in the last 60 days of gestation improves performance of beef cows grazing tropical pastures
Autor(es): Silva, Aline Gomes da
Paulino, Mário Fonseca
Detmann, Edenio
Fernandes, Henrique Jorge
Amorim, Lincoln da Silva
Ortega, Román Enrique Maza
Carvalho, Victor Valério de
Lima, Josilaine Aparecida da Costa
Moura, Felipe Henrique de
Monteiro, Mariana Benevides
Bitencourt, Jéssika Almeida
Abstract: Nutrition is one of the most important factors that affect animal performance, and it therefore also impacts on financial results in beef systems. In this way, finding the best strategy for feeding supplements is of paramount importance. Aiming to evaluate the effect of supplement feeding strategies for beef cows in the last third of gestation, two experiments were conducted. In Experiment 1, 35 pregnant Nellore cows were assigned to a completely randomized design with four treatments: control, which received no supplement; supplementation for the last 30 d of gestation (30-d; 3.0 kg/d); supplementation for the last 60 d of gestation (60-d; 1.5 kg/d); or supplementation for the last 90 d of gestation (90-d; 1.0 kg/d). All supplemented treatments received the same total amount of supplement throughout the experiment: 90 kg (20% of crude protein). A second experiment (Experiment 2) was delineated to evaluate the effects of the amounts offered in Experiment 1 on intake and metabolism. Four multiparous pregnant Nellore cows were assigned to a 4 × 4 Latin square design, with periods of 15 d each. There was a linear effect of the number of days of supplementation on calving body weight (BW; P < 0.05) and a quadratic effect on BW change from parturition to d 31 post-calving (P < 0.05), with cows on the 60-d strategy losing less BW post-calving. No difference was found in offspring birth BW (P > 0.10). A significant linear effect on interval from parturition to conception (P < 0.05) was observed, with the highest calving to conception interval being observed in the 90-d strategy. The level of supplementation did not affect forage intake or neutral detergent fiber digestibility (P > 0.10). Nitrogen excreted through urine tended to increase linearly with the level of supplementation (P < 0.10). Providing 1.5 kg of supplement during the last 60 d of gestation improves cow performance after calving, reducing the magnitude of BW lost, and reduces the number of days from calving to re-conception in the following breeding season compared to the usually recommended period of supplementation of 90 d pre-partum.
Palavras-chave: Flushing
Nutrition
Parturition
Reproduction
Editor: Journal of Animal Science and Biotechnology
Tipo de Acesso: Open Access
URI: https://doi.org/10.1186/s40104-017-0209-x
http://www.locus.ufv.br/handle/123456789/16396
Data do documento: 1-Out-2017
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