تعيين ارث سطوح مختلف آنزيم و جو بدون پوشينه بر عملكرد جوجه هاي گوشتي

Determination of the effects of the enzyme and Hull-less barley on Broiler Performance

This Experiment was conducted to investigate the impacts of different levels of the hull-less barley on broilers performance and their gut activity. Nine hundred and sixty one days old Arbor Acres broiler chicks were used in a 4,3 factorial arrangement with 4 levels of hull-less barley (0, 10, 20 and 30%) and 3 levels enzyme (0, 300 and 600g/ton). Four replicates were allocated to each treatment. Increasing in hull-less barley inclusion rate to diet increased dietary concentration of soluble NSPs. In starter and grower periods, different levels of hull-less barley had significant effects on feed intake, weight gain and feed convesion ratio (P<.0.01 ). In finisher period, different levels of hull-less barley had no significant effects on performance variables. At the overal rearing period (0-49 days), increasing in hull-less barley to diet, affected significantly weight gain, feed intake and feed conversion ratio (p<0.01). Increasing in hull-less barley levels in diet increased the weight of gastrountestinal track, liver and ceca relative to whole body (P<.0.0l) but the abdominal fat and gizzard weight and mortality werenʹt affected by these components. Addition enzyme to diets had no significant effects on studied variable. The results of this experiment suggested that hull-less barley can be include in broiler diets to the extent that soluble NSPs in diet donʹt go upper than 3.6, 4.1 and 4.6 % in starter, grower and finisher periods, respectively. However, considering diet composition, it suggests to use hull-less barley 0, 20 and 30% in starter, grower and finisher diets, respectively.