Comportamento ingestivo de ovelhas e cordeiras em pastagem de azevém-anual sob níveis crescentes de suplementação

Abstract

It was evaluated the ingestive behavior of lactating ewes and ewe lambs before and after weaning receiving different supplement levels (0; 0.5; 1.0, and 1.5% of body weight), grazing on a Italian ryegrass (Lolium multiflorum Lam.) pasture, under continuous variable stocking. The experimental design was completely randomized with repeated measures in time with four supplement levels and two replicates. The supplement utilized was a commercial ration, daily supplied at 2 p.m. It was evaluated the diurnal grazing time, rumination time, idle time and trough permanence time (min/day), and biting rate (bite/min), from 8:30 a.m. to 5:30 p.m. in four dates, being two dates by category (ewes/lambs and weaned lambs). Bite mass (g OM/bite) was obtained by the division of daily forage intake by daily total bites. Increasing supplementation levels provided reduction on diurnal grazing time and increase on permanence time of ewes and ewe lambs near troughs. Ingestive behavior patterns of ewes and ewe lambs were variable with structural and bromatologic characteristics of Italian ryegrass pasture. The differences observed in the grazing process of lactating ewes and ewe lambs happened mainly in function of sward structure and quality of pasture. © 2009 Sociedade Brasileira de Zootecnia.