Desempenho reprodutivo de galos Lohman-LSL alimentados com rações suplementadas com diferentes fontes de óleo e níveis de vitamina E.

Abstract

The aim this study was evaluate breeding and productive performance of Lohmann- LSL roosters. 112 breeding roosters from 16 to 32 weeks of age were allotted to a randomized block design in a 3x2 + 1factorial arrangement, with three sources of oil (soybean, canola and sunflower in 3%) and two levels of antioxidant (200 and 400 mg of vitamin E/kg of diet) and the control (no oil and 0 mg of supplementation of vitamin E). The experimental diets were made based upon corn and soybean meal. At 28 and 29 weeks, semen collection was performed for evaluation of sperm motility, semen volume, concentration and number of total cells. At 29 weeks of age, semen collection to evaluate sperm morphology, rate of osmotic resistance and heat-resistance of spermatozoa. Four roosters per treatment were slaughtered at 30 weeks of age for removal of the testes which were weighted and a sample was obtained for evaluation of the thickness of the seminiferous epithelium, diameter and the population of seminiferous tubule cells. Blood samplings were collected for evaluation of triglycerides and cholesterol. Since 16 up to 30 weeks of age, daily consumption and total weight gain were evaluated. The true fertility test was performed at 32 weeks of age. Data analyses were done with the use of the SAEG program. Significant interaction (P<0.05) was found between the sources of oil and the levels of vitamin E for diet consumption, total weight gain and the weight of the left and right testes. Significant interaction was observed (P<0.05) among the sources of oils for total weight gain, seminiferous epithelium thickness, body weight at 30 weeks of age. Significant difference (P<0.05) was noticed among the levels of vitamin E for the levels of triglycerides, cholesterol and body weight at 30 weeks of age. It may be concluded that any source of oil of the utilized in this study may be added to the breeding rooster diet without the need of elevated levels of vitamin E.