Effects Of Energy Source In The Diet On Nitrogen Balances And Blood Biochemical Parameters During Late Gestation In Multiparous Sows

Our objective was to study the effects of different energy source (fat and starch) on the nitrogen balances and blood biochemical indices in late-pregnancy multiparous LandrancexMeishan crossbred sows .Four dietary treatments and varying concentrations of dietary fat and cornstarch under isocaloric and isonitrogenous. The concentrations of fat and cornstarch respectively is 2% and 63.25%,8% and 50.53%,14% and 37.08%,20% and 24.19% .These results in present experiment as following: 1.A11 treatments were isonitrogenous and isocaloric ,fat:starch ration in diets was different. Digestibility of fat had the trend to increase with the increasing fat level but no significant difference (P<0.10).Maternal weight gain and backfat depth of multiparous sows during gestation had the trend to increase with the increasing fat level but no significant difference (P<0.10).2. All treatments were isonitrogenous and isocaloric ,fat:starch ration in diets was different. The content of fecal nitrogen in multiparous sows decreased linearly (P<0.05).The digestibility of crude protein , nitrogen retention or protein biologic value increased exponentially with fat increasing.3. All treatments were isonitrogenous and isocaloric ,'fat:starch ration in diets was different. Diet treatments had no effects on newborn piglets'body stores of carbohydrates and carcass dry matter. Rich-starch diet is significantly increased newborn piglets'body stores of protein than rich-fat diet (P<0.05).Rich-fat diet is significantly increased newborn piglets'body stores of fat than rich-fat diet (P<0.05).4. All treatments were isonitrogenous and isocaloric ,fat:starch ration in diets was different. Treatments affected the blood indi.ces of multiparous sows during gestation .At pregnancy 110d than at pregnancy 75d . multiparous sows serum glucose and serum urea nitrogen had the trend to decrease with the increasing fat level (P>0.05),serum triacylglycerol(TG) , cholesterol(TC), LDL-C, VLDL-C had the trend to increase with theincreasing fat level (P>0.05). but the HDL-C had the trend to decrease with the increasing fat level (P>0.05) .Rich-fat diet serum TC and LDL-C is significantly higher than rich-starch diet (PO.05).We can drew conclusions from above results that:1.Different energy source and varying the concentrations fat and starch in diets can affect nitrogen balances during late gestation in multiparous sows. Fecal nitrogen excretion had the trend to decrease with the increasing fat level and nitrogen retention had the trend to increase with the increasing fat level.2. Different energy source and varying the concentrations fat and starch in diets can affect blood indices during late gestation in multiparous sows. Serum glucose , HDL-C hadthe trend to decrease with the increasing fat level. LDL-C was significantly increased by fat level increasing. VLDL-C had the trend to increase with the increasing fat level.