Produção de ovinos de corte em quatro sistemas de produção

Abstract

Meat sheep production on four different production systems ABSTRACT -The potential performance of lambs and ewes from the Suffolk breed in pasture of Tifton grass 85 (Cynodon spp.) and ryegrass (Lolium multiflorum) was evaluated in different production systems: lambs weaned with 60 days and kept in pasture; lambs with ewes and kept in pasture; lambs with ewes and kept in pasture with creep feeding; feedlot confined lambs with alfalfa hay + balanced ration. The treatments were applied when the lambs reached 60 days of age until slaughter time, at 32 kg, and were allocated in a completely randomized experimental design, with three replications. A continuous grazing system, with variable stocking rate, was used in pasture treatments. Important effect of the treatments on performance of the lambs was observed. Feedlot confined lambs showed higher daily weight and at lower age at slaughter time. Creep feeding supplementation at 1% LW, did not have effect in lambs with more than 60 days of age kept with the ewes in Tifton 85 grass pasture. The presence of the ewe in the pasture showed important and positive effect in the individual performance of lambs as compared to lambs weaned at 60 days of age.

Desempenho e características de carcaça de cordeiros alimentados em comedouros privativos recebendo rações contendo semente de girassol

“…Neste contexto, esforços têm sido realizados para a redução da idade de abate dos animais (Villas Bôas et al, 2003) com a introdução de sistemas de produção de cordeiros jovens (Poli et al, 2008), nos quais os animais são abatidos com 60 a 70 dias de idade e peso vivo de 27 a 30 kg para produção de carne de alta qualidade, macia e de melhor aproveitamento dos cortes comestíveis.…”

“…Em algumas regiões do Brasil e em outros países onde existe a oferta de carcaças com qualidade comprovada e em cortes especiais, o consumo, assim como as formas de utilização da carne, expandiu-se criando perspectivas para a ovinocultura e tornando necessário o aumento da eficiên-cia de produção do rebanho (Poli et al, 2008).…”

Reatividade e desempenho em cordeiros cruzados Suffolk x Île-de-France

“…VANDENHEEDE & BOUISSOU (1998) reportaram que cordeiros criados com a mãe expressam maiores níveis de reatividade, quando comparados àqueles submetidos à criação artifi cial, além do fato de apresentarem maior desempenho produtivo, como ganho de peso, quando comparados a diferentes sistemas de pastejo (CARVALHO et al, 2005;POLI et al, 2008).…”

Early weaning and concentrate supplementation on the performance and metabolic profile of grazing lambs

“…Poli et al (2008) and Ribeiro et al (2009) observed that suckling lambs showed performance 181 g/d superior to those weaned early and kept only on pasture, with means of 292 g/d for non-weaned and 111 g/d for weaned lambs. Consequently, keeping the lambs with dams on high quality pasture is sufficient to meet their nutritional requirements and obtain higher performance results.…”

“…Conversely, early weaning yields low performance and productivity for lambs maintained exclusively on pasture (Poli et al, 2008;Ribeiro et al, 2009). Performance has been related to changes in nutritional and metabolic status.…”