Document Type : Research Paper
Authors
1 assistant professor at animal science research institute
2 Retired associate professor at Isfahan agricultural research institute
3 Urmia agricultural jihad
Abstract
The effect of using protein concentrate instead of soybean meal on growth performance, production index, blood parameters and humoral of native chicken was assessed. By using a total of 192 one-d-old native chicks (mixed-sex), this study was done as a CRD design with 6 treatments, four replicates, and 8 birds in each replicate for 8 weeks. The experimental treatments included substitution of different levels of protein concentrate instead of soybean meal (0, 25, 50, 75, 100 percent) in diet contained recommended level of crude protein for native chicken, and one treatment was as 100 percent protein concentrate substitution and contained 10 percent lower level of crude protein compared to recommended level for native chicken. Results showed that the highest body weight gain was related to chickens fed with treatments 2, 3, 4, or 5; the highest feed intake was related to chickens fed with treatments 4 or 5; and the highest feed conversion ratio was related to chickens fed with treatments 6 (P<0.05). The highest and the lowest feed cost per kg body weight gain was related to the chickens fed with control or treatment 4 (P<0.05). The highest and the lowest production index was related to the chickens fed with treatments 4 or 6 (P<0.05). In general, substitution of 75 percent of soybean meal by protein concentrate caused optimal growth performance and the lowest feed cost per kg body weight gain of native chickens.
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