GENETIC DIFFERENCES FOR PERFORMANCE OF SOME BROILER STRAINS FED ON NATURAL GROWTH PROMOTERS

Abstract

An experiment carried out and aimed to investigate the genetic differences in productive performance, some plasma constituents, carcass characteristics, microbial population and histological examination of small intestine of two broilers strains fed natural feed additives. One hundred and twenty six unsexed 1 day – old of Hubbard were obtained from a commercial hatchery, randomly distributed into 7 treatments and one hundred and twenty six unsexed 1 day – old of Ross broiler chicks were obtained from a commercial hatchery, randomly distributed into 7 treatments. Each treatment comprised of 18 chicks which divided into 3 replicates of 6 chicks each. Results of this experiment showed that feed additive enhance live body weight and body weight gain compared with control diet with significant differences. Also, there was a significant difference between strains in dressing percentage, where the dressing percentage of Ross was greater than Hubbard. There was a significant reduction in both triglycerides and cholesterol due to inclusion of probiotic or prebiotic. In addition , prebiotic or probiotic enhance villi morphology conditions by increasing villus height which cause an increase in absorption surface area and lead to increase nutrients digestibility. Finally, it could be concluded that, we can use either of Bio-Mos or Enhancer in order to enhance broiler performance as well as broiler health. Key Words: Broiler– Strain - Productive performance – Probiotics - Prebiotics.