The effects of the male to female mating ratio on the heterophil to lymphocyte ratio and duration of tonic immobility (indicators of stress and fearfulness, respectively) were analyzed in two different experiments with different group sizes. In Experiment 1, four different mating ratios (1:11, 1:5, 1:3, and 1:1) and 10 different Spanish breeds of chickens were used; each breeding pen had 12 bir...

Nutrition supplementation in broiler breeder diets are necessary to provide the nutritional requirements for optimal performance of flock after significant genetic improvement production performance. The study aimed determine effect adding vitamin E and organic selenium diet Rose 308 productive reproductive traits. experimental consist 60 hens 10 cocks at 41 weeks age. birds divided into four g...