Effect Of Dietary Energy Levels On Fat Metabolism Of Xupu Geese Before Overfeeding

The trial was determined for two periods from the age of 0 day to 70 days (0-21 days,22-70 days) to estimate the effect of Dietary Energy Levels on fat metabolism of XupuGeese before Overfeeding. 120 healthy Xupu geese (0 days old) were randomLy dividedinto 3 groups. With 4 replications in each group, each replication has 10 geese, theirweghts were similar as treatment groups. They were fed on diets with different energylevels(13.38MJ/kg, 12.13 MJ/kg, 10.87 MJ/kg) in the first stage, and then fed on dietswith different energy levels(13.81 MJ/kg, 12.55 MJ/kg, 11.30 MJ/kg) in the second stage.The result were as follow:1) The weight of XuPu geese were significant increasing with impoving dietaryenergy levels during the phase of 0-21 days. Dietary energy levels can improve thegrowth and weight of goose, but the result was not notable. In the whole stage, the avergeweight of XuPu geese was increasing with improving dietary energy levels, but the resultwas not notable(P＞0.05).2) Dietary energy levels could affect carcass characteristics. With improving dietaryenergy levels, carcass weight and the dressing percentage were accordingly increasing inthe first stage. But abdominal adipose contents, semi-eviscerated carcass weightpercentage, the eviscerated carcass weight percentage, the leg muscle percentage amongall the groups were not significant(P＞0.05). In the secong stage (22～70 days), carcassweight significantly increasing with raising dietary energy levels, but the dressingpercentage, the semi-eviscerated carcass weight percentage, the eviscerated carcassweight percentage, the leg muscle percentage among all the groups were notsignificantly(P＞0.05).3) With improving dietary energy levels, body fat deposition was not significantlyincreasing(P＞0.05) during the stage of 0～21 days. The abdominal fat percentage, chessmuscle fat percentage, subcutaneous fat thickness, intermuscular fat width of the secondgroup were significantly higher than those of the first group and the third group.4) TG, LDL and TCH of the second group were significantly higher than the othertwo groups during the stage of 0～21 days, but dietary energy levels were not affectsignificantly the level of VLDL(P＞0.05). During the stage of 22～70 days, TG., LDL,VLDL of the second group(12.55 MJ/kg) were significantly different with those of theother groups, but HDL and TCH were significantly increasing with raising dietary energylevels(P＜0.05).5) Dietary energy levels didn't affect significantly serum IGF-1 level of XuPu geese in the whole trial stage(P＞0.05), but serum GH levels of the first group were significantlyhigher than the second group and the third group.6) Dietary energy levels didn't affect significantly the expression of MSTN at the ageof 21 days(P＞0.05), but could affect significantly the expression of MSTN at the age of70 days(P＜0.05).