Artículos de revistas
Performance, feeding behavior and digestibility of nutrients in lambs with divergent efficiency traits
Fecha
2019-11-01Registro en:
Small Ruminant Research, v. 180, p. 50-56.
0921-4488
10.1016/j.smallrumres.2019.07.016
2-s2.0-85073415661
Autor
Universidade Federal de Minas Gerais (UFMG)
Universidade Estadual Paulista (Unesp)
Universidade Federal de Lavras (UFLA)
University of New England
Institución
Resumen
The aim was to evaluate the performance, feeding behavior and nutrient digestibility of lambs ranked according to residual feed intake (RFI) and residual intake and gain (RIG). A total of 102 male lambs (½ Dorper ½ Santa Inês; 70 d; 24.6 ± 3.71 kg) were used. The mean values of the RFI classes were -0.101, 0.0, and 0.091, and those of the RIG classes were 1.980, -0.032 and -2.369, for efficient, medium and inefficient lambs, respectively. Average daily gain was not correlated to RFI, but was correlated to RIG. Physiological parameters (i.e., respiratory frequency and heart rate), ruminal movement and rectal temperature were similar between efficient and inefficient lambs (i.e., for RFI and RIG; P > 0.05). Efficient RFI and RIG lambs spent less time ruminating and drinking water and more time eating (P < 0.05). Rumination time is a good feeding behavior marker to distinguish efficient and inefficient lambs (i.e., RFI and RIG). Inefficient feedlot lambs exhibited greater dry matter intake; this difference was not reflected in digestibility traits. These results may assist in the identification of more efficient animals to lower production costs and mitigate the environmental impact of lamb production systems.