Morfometria testicular de ovinos suplementados com torta de mamona (Ricinus communis l) detoxificada em substituição ao farelo de soja

Abstract

The study aimed to evaluate through testicular morphometry the effect of substitution of soybean meal for castor bean (Ricinus communis L) detoxified in sheep supplement. 24 crossbred sheep were used of Santa Inês and Dorper, not castrated, with average weight of 29 ± 0.8kg, distributed in three groups receiving 90 days isonitrogenous diets formulated according to NRC (2007), containing 0; 50 and 100% detoxified castor cake instead of soybean meal in feed. The animals remained in Aruana pasture grass (Panicum maximum cv Aruana.) And was carried out by feeding the group in the amount of 1.2% of body weight once a day (07: 00h) and water ad libitum. After the supplementation period, animals were weighed and slaughtered in specialized refrigerator and collected and weighed testicles. Then, a width of 5mm by 10mm in length fragments of the testes were obtained from each animal testicular middle portion for histological processing. Data were evaluated by analysis of variance at 5% probability. There was no difference (P> 0.05) for body weight at slaughter (37.74 ± 0,27Kg); testicular average weight (0.12 ± 0,09Kg); GSI (0.0017%); diameter of the seminiferous tubules (271.10 ± 28,13μm); height of the germinal epithelium (66.01 ± 10,30μm); volumetric proportion of the components of testicular parenchyma (tubular components - 91.57% and intertubulares components - 8.43%); total length of seminiferous tubules (79.05 ± 8,20m); length of seminiferous tubule by testicle gram (0.66 ± 0,17m / g), leydigosomatic indices (0.0010%) and tubulossomático (0.2494%). Thus, the replacement of soybean meal by detoxified castor bean can be performed in feed formulation for sheep supplementation up to 100% without testicular morphometric changes, it is important to perform seminal ratings in future studies.