Heterogeneous genetic cows of three genetic groups in feedlot system in the state of Pernambuco, Brazil

Christiano Raphael  de Albuquerque Borges; Marcílio  de Azevedo; Ivalda  de Albuquerque Lima; Lúcia Helena  de Albuquerque Brasil; Marcelo  de Andrade Ferreira

Heterogeneous genetic cows of three genetic groups in feedlot system in the state of Pernambuco, Brazil

Autores

Christiano Raphael de Albuquerque Borges

Marcílio de Azevedo

Ivalda de Albuquerque Lima

Lúcia Helena de Albuquerque Brasil

Marcelo de Andrade Ferreira

Editor

Universidade Estadual de Maringá

Descripción

The behavior of 15 Girolando cows from th ree 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. G roup 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.