The effect of feed restriction and compensatory growth on microbial crude protein production in fattening Afshari male lambs post weaning

This experiment was conducted to evaluate the effect of feed restriction and compensatory growth in increasing weight and microbial protein production of 21 afshari lambs post weaning with an average of 27 kg. Randomly Lambs were divided into three groups. The whole control treatment was fed with full ration (straw¡ hay and concentrate). The second and third groups regularly were fed 30 and 50 days by limited diet ration of 50 percent wheat straw and 50 percent of alfalfa. Next then, the other two groups were given with full ration. In order to estimate microbial protein produced by measuring urinary excretion of purine derivatives randomly, among each treatment urine samples were taken of three lambs every two six times at all. Using High Performance Liquid chromatography(HPLC) metod for the measuring of purine derivatives. The results showed that in all groups dry matter intake during fattening period and weight increase of lambs was increased and dry matter intake increasing causes microbial protein production increasing. In treatment control as during the fattening period, lambs weight and consumable dry matter increased which cause increased purine derivatives and microbial protein productions. In 30 and 50 days of treatments restriction microbial protein production during feed restriction was low level which with feed restriction finished and compensatory growth beginning productions increased that because it was quality of full. Meanwhile, better digestibility full ration causes feed consumable and purine derivatives(allantoin and uric acid) and microbial protein productions. So effect quality of full ration and also feed consumable increased was significant (p