Crescimento e desenvolvimento dos componentes corporais de cordeiros Texel X Corriedale em distintos sistemas.

Abstract

We evaluated the growth and development of body components of sheep Texel x Corriedale in different systems. The study was conducted in the municipality of Arroyo Grande, being used 45 non-castrated lambs divided into three groups of fifteen: pasture, pasture next to the mother and pasture with supplementation (soybean hulls corresponding to 1% of body weight). To slaughter was used the criterion of body condition between 2 - 3 (scale 1 - 5), occurring in groups of lambs from each lot with the following ages: 120, 160, 200 and 280 days. The analysis of variance detected significant differences (P <0.05) for growth in different systems, and the lambs stayed with their mothers on pasture had higher weight gains for the lambs of the other two groups (weaned and supplemented). The analysis of daily weight gain showed significant effect (P <0.05) between systems up to 120 days. The lambs that remained with the mother (suckling) performed better than the other groups during this period. From the 120 days there was no difference by the end of the experiment. The results show that the housing development to the whole (body weight) was heterogonic positive (late) for the three groups. To head, heart, kidney and liver + gall development was early to finish lambs on natural pasture for lambs on natural pasture and supplementation, this type of development occurred in the legs, head, trachea and lungs + liver + gallbladder. There was an effect of the finishing system on the growth and development of lambs from Texel x Corriedale. Lambs grazing without the practice of weaning showed higher average daily gain of body weight until 120 days of age. Lambs that had the sole power source to pastures had higher percentage of green viscera.