不同脂肪对肉鸡营养素沉积、体组成和血清代谢物的影响

EFFECT OF DIFFERENT FAT SOURCES ON NUTRIENTS RETAIN,BODYCOMPOSITION AND SERUM METABOLITES FOR BROILERS

本试验利用公肉雏鸡研究不同脂肪来源对肉用鸡生长性能、营养素表观利用率、血清生理指标、胴体特性和组织脂肪酸组成的影响。试验结果表明：（１）添加脂肪提高了蛋白质、干物质的表观利用率，而日粮总脂肪的表观利用率下降。（２）添加脂肪改善了生长性能，提高日增重、改善饲料转化效率。（３）添加牛脂后血清卵磷脂水平明显上升，高水平牛脂添加后血清甘油三酯明显下降。添加各种脂肪后脂肪酶活性明显下降，且随添加水平的提高而显著下降，各处理组之间存在显著差异。（４）添加豆油后，肝脏脂肪含量下降；而添加饱和度比较高的黄油和牛脂后，肝脏脂肪含量提高；肌肉中脂肪含量由于脂肪添加而明显提高，但低水平豆油组例外。（５）添加牛脂后肝组织Ｃ２０：４ｎ－６和ＰＵＦＡ含量明显下降，而添加豆油和高水平黄油后明显提高了组织中Ｃ１８：２ｎ－６和Ｃ１８：３ｎ－３等肪脂酸的含量。（６）添加豆油后提高了胸部肌肉组织中的Ｃ１８：２ｎ－６和Ｃ１８：３ｎ－３等脂肪酸的含量，添加牛脂后Ｃ１８：２ｎ－６含量明显下降。

he experiment was conducted to investigate the effect of different fat sources on performance,nutrient apparent availability,serum physiological criteria,carcass characteristics and tissue fatty acid composition for broilersThe results showed:(1)The apparent availability(AA)of dry matter (DM)and crude protein(CP)were promoted by supplemental fatsA decrease in the AA of dietary fat was observed in birds fed on the diets added with fats(2)Supplemental fats promoted average daily gain (ADG) and improved feed conversion rate (FCR).(3)Serum lecithin concentration increased remarkably with addition of beef tallowSerum triglyceride content increased notably with high level addition of tallowSerum lipase profile decreased significantly by the addition of fats,decreased significantly with addition levelSignificant difference was observed among different fat sources(4)The content of fat in liver was enhanced notably with yellow grease and beef tallow additionThe breast muscle fat content was promoted significantly by addition of fats excluding low level supplementation of soybean oil(5)Inclusion of beef tallow reduced significantly tissue C20:4n6 and polyunsaturated fatty acids (PUFA) profileTissue C18:2n6,C18:3n3 profile were elevated remarkably by inclusion of soybean oil and high level addition of yellow grease(6)Inclusion of soybean oil elevated significantly tissue C18:2n6,C18:3n3 profileC18:2n6 profile decreased with the inclusion of beef tallow significantly