Oleo de Iinhaça na dieta de galos e seus efeitos sobre a fertilidade e congelabilidade do sémen.

Abstract

This study aimed to evaluate the fertility and cryopreservability of semen from cocks fed with diets containing flaxseed oil in different levels, instead of soybean oil. A total of twenty (20) cocks medium weight, aged 14 months, were fed with experimental diets for 12 weeks. The experimental arrangement was completely at random. The diets consisted of T1-0% of flaxseed oil, T2-25% of flaxseed oil, T3-50% of flaxseed oil, T4-75% of flaxseed oil and T5-100% of flaxseed oil. The diets derived from maize and soybean meal were formulated to meet the nutrional requeriments, being isonitrogenous and isoenergetic diets, differing only in the levels of flaxseed oil in replacement for soybean oil. The zootechnical performance was not expressively affected by treatments (p> 0,05). The seminal volume, sperm count, membrane integrity and sperm penetration test of fresh semen were not influenced significantly by treatments. Sperm motility was significantly influenced (p<0,05), with the best result for the T3 (50% of flaxseed oil). The fertility rate was not infuenced significantly. Motility and sperm penetration test, in the analysis of frozen semen, were significantly influenced by diets, where T5 (100% flaxseed oil) got the best averages in both analyses. Membrane integrity was not affected significantly. These results indicate that substitution of soybean oil by flaxseed oil at 50% in the cocks diet improved the motility of fresh semen. In relation to frozen semen, the substitution by flaxseed oil at 100% improved the motility and sperm penetration.