Effect Of The Degree Of Synchrony Between Carbohydrate And Protein Sources On Utilization Of Rations By Growing Sheep

Abstract

To what extent: the degree of synchrony between the rates of digestion or carbohydrate and protein of feeds would have an effect on DM degradation kinetics and in-vivo nutrients digestion. dietary N utilization, rumen fermentation, weight gain and feed utilization efficiency of sheep Were studied. Corn (C) and barley (B) as carbohydrate sources of variable fermentation rates - and soya bean meal (S) and com gluten meal (G) as protein sources of variable degradability rates, were used to formulate four iso-caloric-isonitrogenous concentrate mixtures. Degradation kinetics of experimental mixtures were evaluated on four ruminally fistulated wethers using the nylon-bags technique. Experimental feeding trial for 112 days on 24 Barki male lambs weighed 38.62 ± 1.48 kg in four random groups was carried out to investigate the effect of experimental diets fed at 2.5% DM of body weight on growth performance of sheep. results of degradation kinetics indicated that, inclusion of gluten-meal either corn or barley-based mixtures decreased both rate of degradation and effective degradability of DM. Nutrient digestion coefficients for OM, CP and NEE with com-based mixtures either soya bean meal or gluten meal, however, the barley-based mixture with soya bean meal had higher (P<0.01) digestibility values for OM. CP and NEF than gluten meal. Digestion of CF und EE Has not significantly influenced by changing either carbohydrate or protein feed sources. Nutritive value in terms of TDN units and dietary N utilization were value (P<0.01) declined with barley-gluten mixture, while the highest nutritive value (P<0.01) was obtained with com-soybean mixture Ruminal fermentation pattern after 3 hrs of feeding showed a lower (P<0.01) pH and higher (P<0.05) NH3-N and (P<0.01) VFAs concentrations com based diets. Average daily gain (ADG) was (P<0.01) higher by 23% for sheep fed meal than those fed on barley-gluten meal diet while, ADG of sheep was comparable With feeding corn-gluten meal or barley-soybean meal diets, Feed conversion (kg DM/Kg gain) was (P<0.05) improved with com-soyabean meal diet than That with Other diets. However; feed conversion in terms of TDN or DCP, kg/kg gain was not statistically different among groups. It is concluded that, the degree of synchrony between carbohydrate and protein feed sources was proven an important nutritional factor in optimizing utilization of the concentrate mixtures fed by rurninants, Moreover, soyabean meal with either corn or to a lesser extent barley is rather advisable to be used than gluten meal in the feed mixtures of growing sheep. While, barley-gluten meal mixture is extremely inadvisable to be used in the applied feeding practices.