The purpose of this experiment was to compare the effects of calcium, phosphorus, and fennel extract (FE) and vitamin D 3 on performance and egg shell quality in post molted Ross broiler breeders from 96 to 102 weeks. Each pen consisted of 10 hens and 1 rooster. This experiment was done in a completely randomize design with seven treatments (different levels of calcium, phosphorus plus fennel extract or vitamin D 3) that each treatments assigned to 4 replicates. The addition (50 mg/kg diet) FE had significant affection egg production, egg mass, settable egg, shell quality, relative albumin weight and body weight gain (p<0/05). The results of this experiments showed that decrement of the calcium and phosphorus up to 10 percent, did not significantly affection indicated parameters (p>0/05), but lower levels of calcium and phosphorus (20%) significantly affect these parameters (p<0/05). Supplementation of vitamin D 3 to the diet with 10 percent less calcium and phosphorus could increase egg production and percentage of settable eggs. Additionally, when calcium and phosphorus was 10 percent lower than control diet, supplementation of FE increased egg production and percentage of settable eggs but this effect did not was the same as vitamin D3.The results of these experiments indicated that supplementation diet with FE had significant affect when diets contain 10 percent lower in calcium and phosphorus.
This experiment was conducted to investigate effects of l-arginine on productive performance and egg quality parameters, blood and hormone parameters of laying hens in late phase of production for 8 weeks. Forty eight Hy-Line W-36 were used in a completely randomize design with four level of l-arginine (1/20=control diet, 1/32, 1/44 and 1/56 percent) and four replicate from 92-98 weeks of age. Layers were weighed at 90 week of age and randomly distributed into 16 cages in order to have a similar pen body weight. The performance data were recorded daily, whereas the egg quality traits were determined biweekly. At the end of experiment 2 eggs from each cage were collected for egg yolk cholesterol analysis. Supplementation of l-arginine in diet did not have significant effect on productive performance and egg shell quality in layers. Furthermore, the addition of l-arginine to diet did not have significant effect on the egg yolk cholesterol (P> 0.05). The results of this study showed that supplementation of larginine improved Hough unit and yolk cholesterol and blood progesterone with no adverse effect on productive performance.
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