0.05). Tibia ash and external diameter of it significantly increased by organic acid (P<0.05). Also use of organic acid and probiotic supplements improves strength and resistance against impact of tibia. The results obtain from this study indicate that use of organic acid supplementation can have beneficial effects on tibia characteristics of laying hens.]]>
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0.05) for carcass characteristics (carcass, thighs, breast, back + neck, liver, heart, spleen, gizzard, borsa and abdominal fat weights, and also intestine weight and length of the broiler chickens). The dietary cation-anion balance × microbial phytase interaction was significant (P < 0.05) for immune system of broilers at 24 and 34 d of age. Overall, results of the present study indicated that variability in phytase respons in performance and immune system of broiler chickens may be affected, in part, by differences in dietary electrolyte levels.]]>
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0.05). This study indicated that while there was non-significance difference between Guilan native and Holstein, but the crossbreeding clearly affected on the expression of two genes associated with genetic resistance.]]>
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