Effects of dietary crude protein content and food intake on the production of semen in two lines of broiler breeder males

aves de corral biological differences crude protein espermatozoo feed intake feeding level genotipos genotypes macho males niveau d'alimentation nivel alimenticio plane of nutrition poultry prise alimentaire (animaux) proteina bruta proteine proteins reproduction semen spermatozoa sperme strain differences testes testicule volaille