Intestinal Characteristics, Alkaline Phosphatase and Broilers Performance in Response to Extracted and Mechanical Soybean Meal Replaced by Fish Meal

An experiment was conducted to evaluate the extracted (ES) and mechanical (MS) soybean meals two levels ۲۵% and ۳۵% in broiler chicken feeding. Three hundred and fifty two one-day-old unsexed Lohman chickens were placed in four treatments by ۴ replicates and ۲۲ chickens in each in a ۲×۲ factorial arrangement. Feed intake was increased significantly in starter period by ES in comparison with MS. Feed conversion ratio was significantly improved when ۲۵% of ES was replaced by fish meal compared with ۳۵% of ES in starter period. Body weight was significantly higher by ۲۵% ES replaced by fish meal in comparison with ۲۵ and ۳۵% MS in grower period. Metabolizable energy was declined in all options (AME, AMEn, TME and TMEn) in MS than ES. Significant depressing in jejunum length was observed by ۳۵% in the two types of soybean meal compared with ۲۵% mechanical soybean meal replaced by fish meal in ۱۴ days. In more details, villous length was lower by mechanical soybean meal in comparison with ES. Alkaline phosphatase enzyme activity was significantly higher in ۳۵% ES in comparison with ۲۵% ES replaced by fish meal and ۳۵% MS in ۱۴ days. In contrast, alkaline phosphatase enzyme activity was reduced remarkably by ۳۵% mechanical soybean meal compared with ۲۵% extracted soybean meal replaced by fish meal in starter period. Urease activity in extracted soybean meal (۰.۰۷) was lower than mechanical soybean meal (۰.۲۲). The results of this study have shown better performance by extracted soybean meal compared with mechanical soybean meal. In spite of this, less expensively processed mechanical soybean meal (MS) at ۲۵% level replaced by fish meal could be more economical in broiler chicken feeding.

کلیدواژه ها:

Broiler ، Alkaline phosphatase ، Intestinal Characteristics ، Soybean meal