اثر روشهاي فرآوري دانه جو و منابع نیتروژن غیر پروتئینی جیره غذایی بر عملکرد، قابلیت هضم مواد مغذي و خصوصیات لاشه در برههاي پرواري نژاد افشاري .

Background and Objectives: In some respects, Food processing may increase livestock performance. Today some methods of grain processing have been considered. On the other hand, the lack of animal feed, especially with the development of industrial methods of animal husbandry waste in many parts of the world, has led farmers and researchers to think about identifying and using agricultural and livestock waste and new food sources for animal nutrition, including poultry manure. And urea is mentioned in the diet of ruminants. Since no research has been done on the effect of barley grain processing methods and non-protein nitrogen sources in the diet on growth performance, nutrient digestibility, and carcass characteristics in Afshari breeding fattening lambs, the present study was conducted. Materials and Methods: This experiment was conducted in a completely randomized design with seven treatments, including a control treatment containing whole barley grain (without milling) and without urea and chicken manure. Treatments 2, 3 and 4 were processing methods of milling, filling, and pelleting, respectively, with a certain level of urea. (1%) And treatments 5, 6 and 7 were processing methods of milling, filling and pelleting, respectively, with a certain level of poultry manure (12%). Five Afshari lambs (24±1 kg, age of 3 months) were assigned to each of the treatments. Lambs were then kept individually in separate cages for 14 days as an adaptation period following 84 days of fattening period. Dry matter, ash, crude fiber, crude fat and crude protein were determined using the method (AOAC, 2000), Neutral detergent fiber and Acid detergent fiber based on the method of Van Soest et al (1991). At the end of the rearing period, three heads from each treatment were randomly slaughtered, then hot and cold carcass weights were measured as well as evaluation of its components. Results: experimental treatments. The apparent digestibility of dry matter and organic matter were significantly different, and the control treatment (whole barley grain without urea and poultry manure) had the highest apparent digestibility. Digestibility in non-fibrous carbohydrates was significantly different, therefore, treatment 5 (processing method of milling with poultry manure) had the highest apparent digestibility. Experimental treatments were significant on thigh weight, neck weight, tail weight, ventricular fat weight, carcass length, and half-carcass length. Conclusion: The results showed that processing methods of barley grain with sources of non-protein nitrogen had a significant effect on daily weight gain, dry matter consumption, feed conversion ratio, some organs of fattening lambs, digestibility of dry matter, and organic matter compared to the control group. Generally, it is possible to use barley grain processing with urea (1%) and poultry manure (12%) in the diet of fattening lambs without harmful effects on production parameters and fattening performance. [ABSTRACT FROM AUTHOR]