| In the effort to increase the growth potential of broilers, geneticists have selected for rapid growth and feed conversion for decades. This selection has led to a decline in reproductive capacity of the parent stock due to the negative correlation between growth and reproduction. Currently the only effective method of countering these negative effects is through the use of feed restriction. The use of feed restriction has led to concerns about the welfare of the birds. This dissertation looks at the results of shortening the growth period of broiler breeder males, testicular development, fertility and mating behavior. The use of shortened growth periods allows for reduced levels of feed restriction, thus improving the welfare of males during the rearing period. The results showed that by lowering the age at which male breeders are light stimulated by three weeks, testicular size was increased, while having no effect on the mating behavior and fertility of the males. This shortening of the rearing period allows the males to grow at a faster rate, while lowering feed and housing costs. These benefits can be used to increase the profit of commercial breeders. |
