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Effects of heat stress on rumination activity in Holstein-Gyr dry cows

2020; Elsevier BV; Volume: 239; Linguagem: Inglês

10.1016/j.livsci.2020.104092

1878-0490

Gilson Gonçalves Maia, L. G. B. Siqueira, Carlos Otávio de Paula Vasconcelos, Thierry Ribeiro Tomich, Luiz Sérgio de Almeida Camargo, João Paulo Pacheco Rodrigues, Rafael Araújo de Menezes, L.C. Gonçalves, Brida Faggion Teixeira, Rodrigo de Oliveira Grando, Luiz Altamiro Garcia Nogueira, Luiz Gustavo Ribeiro Pereira,

Animal Behavior and Welfare Studies

Abstract The objective of this study was to evaluate the effects of heat stress (HS) on: i) time and daily pattern of rumination and ii) in situ degradability in Holstein-Gyr crossbred dry cows. Nine cows, weighing 556.2 ± 97.1 kg were housed in a climate chamber (average THI=83.1) or a freestall barn (average THI=66.5) randomly assigned to treatments in a crossover design. Cows were fed corn silage ad libitum and 1 kg of concentrate as a maintenance diet. To measure rumination, we used a sensor attached to a collar. The in situ ruminal degradability was evaluated by incubation of concentrate, silage, and diet samples into the rumen of a fistulated cow for 6, 24, 48 and 96 h. The RT was affected by HS (P