Periódicos Brasileiros em Medicina Veterinária e Zootecnia

p. 91-96

Heterogeneous genetic cows of three genetic groups in feedlot system in the state of Pernambuco, Brazil - 10.4025/actascianimsci.v34i1.11306

Raphael de Albuquerque Borges, Christianode Azevedo, Marcíliode Albuquerque Lima, IvaldaHelena de Albuquerque Brasil, Lúciade Andrade Ferreira, Marcelo

The behavior of 15 Girolando cows from three genetic groups (1/2, 5/8 and 3/4 HG) in feedlots was evaluated. Experimental design was completely randomized with 3 treatment (genetic groups) and 5 replicates. The animals were evaluated by the variables: food, rumination, rest, locomotion, water intake, demand and time in the shade, and other activities. Group 5/8 HG spent more time feeding (267.88 min.) than groups 3/4 HG (245.55 min.) and 1/2 HG (259.55 min.). Idle standing time was higher (204.66 min.) for 3/4 HG when compared to the other groups. There was no statistical difference for the duration of rest in the shade. Solar radiation and THI were the factors which most influenced the animals behavior. Results show that the genetic groups 5/8 and 3/4 HG had a higher sensitivity to heat than 1/2 HG

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