Acta Scientiarum: Animal Sciences (Jan 2008)
Características das carcaças e componentes do peso vivo de cordeiros terminados em pastagem ou confinamento = Carcass characteristics and live weight components in lambs finished on pasture or feedlot
Abstract
O trabalho objetivou avaliar as características da carcaça e os não-componentes da carcaça de cordeiros em quatro sistemas: cordeiros desmamados aos 60 dias mantidos em pastagem; cordeiros + ovelhas em pastagem; cordeiros + ovelhas em pastagem + concentrado em creep feeding (1% PV); cordeiros desmamados aos 60 dias e confinados. Os cordeiros foram abatidos quando a média de peso vivo do tratamento alcançou entre 32-34 kg. Após o abate, foram coletados e pesados os não-componentes da carcaça. Obtiveram-se pesos, rendimentos emedidas objetivas das carcaças e por cálculos a compacidade de perna e carcaça. A metodologia para determinar o momento de abate promoveu grande variação (7 a 14 kg) no peso vivo final entre os animais do mesmo tratamento. Houve correlação significativa (p This experiment had the objective to evaluate the carcass characteristics and the non-carcass components of lambs on four systems: lambs weaned at 60 days of age kept on pasture; lambs + ewes kept on pasture; lambs + ewe + concentrate in creep feeding; lambs weaned at 60 days and kept on feedlot. Lambs were slaughteredwhen mean live weight from the tratament reached 32-34 kg. After slaughter, the noncarcass components were collected and weighed. The weight, yield and carcass measures were obtained, while leg and carcass compacity was calculated. The elected methodology fordetermining slaughter time resulted in large variation (7 to 14 kg) in the slaughter weight of lambs from the same treatments. There was a significant (p < 0.05) positive correlation between hot (r = 0.83) and cold (r = 0.85) carcass weights, and slaughtered weight. Lambsweaned and finished on pasture showed lower (p < 0.05) hot carcass dressing (42.3%), cold carcass dressing (40.2%), carcass biological dressing (51.8%) and thorax width (22.99 cm) and higher (p < 0.05) gastrointestinal content (5.6 kg). The presence of dams had aninfluence in systems were there was no weaning, in regard to carcass quality, as it was very similar to that observed in weaned lambs kept on feedlot.
