عنوان مقاله [English]
BACKGROUND AND OBJECTIVE: The use of high protein foods that are produced in the country as well as a cheaper price than other sources of protein imported from abroad can be important to reduce the cost of food intake. On the other hand, it is important to replace a good protein source for fast growth and balance between in degradable and degradable protein in the rumen. Hence, the purpose of this experiment is to investigate the role of nitrogen source in the occurrence of livestock potential, as well as the use of sub-products instead of conventional sources to reduce the cost of diet.
Materials and Methods: A total of 28 male lambs were evaluated to the effect of poultry by product meal in a completely randomized design. Treatments include 1- 100% soybean meal 2- 67% soybean meal and 33% poultry by product meal, 3- 33% soybean meal and 67% poultry by product meal, 4- 100% poultry by product meal, 5- 67% meal Soybeans and 33% of poultry by product meal processed whit Microwave heating, 6-33% of soybean meal and 67% of poultry by product meal processed whit Microwave heating, 7-100% of poultry by product meal processed whit Microwave heating. Sheep food requirements were adjusted according to the recommendation of the National Research Council (2007) with the same levels of energy and protein. growing performance and economic efficiency, apparent digestibility of treatments, blood parameters and carcass analysis at the end of fattening period.
Results: The results showed that the replacement of soybean meal levels with poultry by product meal was not significantly different in terms of feed performance, including dry matter intake, daily gain, feed conversion ratio and food efficiency (P> 0.05). The result showed that there was a significant difference in digestibility percentage (P <0.05). Treatment of 2 showed the lowest digestibility (%50.9894) of other treatments. The lowest feed costs per kilogram of weight gain compared to treatment 1 were respectively 7.6.3 and 4, respectively, with 15, 7.6 and 5 percent reduction in feed costs per kilogram of weight gain. Blood urea nitrogen, high density lipoprotein and very low density lipoprotein were significant difference (P <0.05), but for total protein, blood glucose, cholesterol, triglyceride and low protein density lipoprotein were no significant difference (P > 0.05). There was no significant difference between carcass weight, weight percentage of neck, loin, breast and fat tail. However, there was a significant difference for weight percent of leg, hand, liver and heart (P <0.05).
Conclusion: In general, the use of poultry by product meal in ration of lambs can be a good alternative to soybean meal, while maintaining the performance yield, has a good economic return.