Effect of different levels of calcium and phosphorus in native hens performance of Khorasan station in different production stages.
2013
Hesabiyehe namgi, Ali Reza | Mohammadpoor, Asgar | Yagobfar, Ali Akbar | Mirzaeei, Rajab Ali | Norozi, Mohammad | Ardallandoost, Ali Akbar
This experiment was conducted to evaluate the effects of different levels of calcium (Ca) and phosphorus (P) on performance native hens of khorasan province. 400 pieces of native hens of Khorasan station were used in a completely randomized design (factorial experiment) with 8 treatments, 5 replicates and 10 hens in each replicate of age 26 to 50 weeks. Eight experimental diets based on corn, soybean and wheat contain different levels of Ca (2.5, 3, 3.5 and 4) and P (0.5 and 0.75) per percent of diet, and levels of other nutrients such as energy and crude protein was similar as possible. The results showed that different levels of Ca and P did not show any effect on egg weight. Levels of Ca have significant effect on the egg production, so that the highest egg production and egg mass was observed in the 3.5% Ca, although the level 3 and 3.5 percent of the Ca in the early production period (26-33 weeks) had similar effects. P levels had no effect on the egg production and egg mass. Level of 4% Ca showed the highest feed consumption, but P levels did not effect on feed intake. The best FCR was observed in the group receiving 3.5% Ca. Effect of Ca levels on tibia ash was significantly so that the lowest of ash was abserved in 2.5% Ca. Levels of 0.75 P was reduced ash of the tibia. Overall, the results of this experiment showed that 3.5% Ca improves egg production and FCR in native hens, but P levels had no effect on production traits. Key words: calcium and phosphorus, native hens of Khorasan, Performance, nutrient requirements : Abstract
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