Dietas com diferentes fontes de fibra para genótipos ovinos

Abstract

The aim this work was evaluate the effect of four feedlot diets, with different sources of fiber (sugarcane bagasse- SC, lucerne hay- LH, citrus pulp- CP and soybean hulls- SH) on nutrition evaluation and production evaluation, and evaluate the effect of four genotypes (½ Dorper x ½ Santa Inês- DSI, ½ Texel x ½ Santa Inês- TSI, ½ Somalis x ½ Santa Inês- SSI e Santa Inês- SI) in production index of feedlot. In experiment 1, was used 5 males sheep, castrated, with body weight of 50 kg, housed in metabolic cages. In experiment 2, was used 80 males lambs uncastrated, housed in individual stall. Among diets, the lower values of pH and N-NH3 in rumen, ocurred in SH diet, but highest values of intake, productive performance and morphometric measurements was in diets with roughage sources of fiber (SB and LH). Among genotypes, highest growth curve and average daily gain occurred in DSI, highest measurements of animal height in SI, better measurements of legs and arm (circumference and length), longissimus dorsi area and feed conversion in TSI. It was concluded that all diets can be used in feedlot of lambs, and that DSI and TSI genotypes have better production index