Eficiência reprodutiva de galos reprodutores de corte submetidos à dieta com diferentes níveis de energia metabolizável e proteína bruta

Abstract

The present study was to evaluate the reproductive performance of broiler breeders fed different levels of protein and metabolizable energy treated with three different diets, varying amounts of metabolizable energy and crude protein. In one treatment, the heavy broiler breeders were fed a diet with 13.8% CP and 2750 Kcal / kg, 22 to 66 weeks of age. In treatment two, the roosters received the same ration provides for the females, being from 22 to 36 weeks of age containing 15% CP from 36 to 60 weeks, 15.2% CP and 60 to 66 weeks, 14% CP, all diets contained 2850 Kcal / kg. In treatment three, the breeding males fed a diet with15% CP and 2700 Kcal / kg from 22 to 66 weeks is old. The semen was collected from 16 rooster each treatment in three different ages of week, 34, 38, 43, 48 and 51 weeks. The semen collected was subjected to staining protocol with toluidine blue and subsequently evaluated by computer image analysis, with measurements of area, perimeter, homogeneity and intensity of compaction of chromatin in each head of spermatozoa. The roosters fed with high protein (15%) showed improve results in terms of compression and density of the heads of sperm chromatin. This same group had values of spermatozoa size smaller, which indicates minor morphological changes. It wasn t possible to correlate the onset and fertility with other data, as in this study there was no significant difference between treatments (p >0.05). Concerning the age of the rooster, regardless of the diet used, all treatments showed changes in chromatin compaction, and the roosters fed with 13.8% crude protein and 2750 Kcal / kg, showed greater changes in chromatin compaction. This can explain the decrease in fertility, usually observed in the field after this period, in flocks of broiler breeders.