Effects Of Diets With Different Combinations On Digestion And Metabolism Of Nutrients And Metabolic Parameters Of Rumen Of Sheep

The two experiments were carried out to study effects of three treatments of diets with different combination of feed on metabolic paramenters of rumen fluid and digestion and metabolism of nutrients in sheep. Experiment 1: Three GanSu High Mountain fine-wool wethers fitted with permanent rumen fistula were chosen as donor animal of rumen fluid to determine the digestibilities in vitro of DM and OM of seven diets of the experiment with beet pulp or pomace of different proportions. The results showed: (1) Under isocaloric and isonitrogenous level, the digestibilities of DM and OM of diets were correlative with ADF,and the correlations were respectively -0.8628(P<0.01)and　-0.7338(P=0.06) . (2) The digestibilities of DM and OM of the diet with percent four beet pulp were higher than controlled diet, but the digestibilities of DM and OM of the diet with 4% pomace were lower than controlled diet. The nature of fiber in beet pulp and pomace was the main factor which influenced digestion of DM and OM in two diets. The fiber of beet pulp was digestible easily and soluble fiber, and the content of ADF(29.18%)was lower ; the content of ADF in pomace(42.20%)was higher, and the degree of lignification of its fiber was higher, too. (3) The digestibilities of DM and OM of diet with percent eight beet pulp were similar to the controlled diet, but the digestibilities of DM and OM of diets with 12% beet pulp and 8%, 12% pomace were lower than the controlled diet. Experiment 2: Three GanSu High Mountain fine-wool wethers fitted with permanent rumen fistula (average life weight 22.5kg) were chosen to study the effects of different conbinated diets on digestibility of nutrients and metabolic parameters of rumen in sheep. It was designed as 3×3 Latin square with three periods and three treatments of diets (A-controlled diet,B-diet with 8% beet pulp,C-diet with 8% pomace). The results showed : (1) The apparent digestibilities of DM and OM of A, B diets were higher significantly than C(P<0.05). (2) The trends of B higher as contrast to treatment A (P=0.368 ,P=0.115, C(P=0.111,P=0.056)and A higher as contrast treatment C(P=0.252 ,P=0.307) on apparent digestibilities of NDF and ADF were observed. (3) N digestibility of treatment B was higher significantly than A, C(P<0.05), but there was trend of C higher as contrasted to treatment A(P=0.217); No significant difference of the retention of N occurred among three treatments, and the trend of B higher as contrasted to A(P=0.217)was only found. (4) The apparent digestibility of Ca of treatment B was higher significantly than A (P<0.01)and C(P<0.05),and C was higher significantly than A(P<0.05), too; the trends of C higher as contrasted to B and B higher as contrasted to A (P<0.05) on apparent digestibility of P were found. (5) There were no significant differences for pH, total nitrogen, ammonia nitrogen, urea nitrogen, protein nitrogen and microorganism nitrogen among three treatments of diets(P>0.05). (6) It was seen from all items measured that the treatment B was the best one; some indexes of treatment C were worse than A, C, but it was yet feasible.