α-酮戊二酸对热应激肉鸡生长性能和肌肉品质的影响

Effects of Alpha-ketoglutarate on growth performance and meat quality of broilers under heat stress

试验旨在研究α-酮戊二酸对热应激肉鸡生长性能和肌肉品质的影响。通过给高温应激肉鸡饲喂含0.5%α-酮戊二酸（α-ketoglutarate,AKG）的日粮35 d,研究AKG对热应激肉鸡生长性能、肌肉品质、抗氧化功能和能量代谢的影响。结果表明：1与对照组相比,热应激处理显著降低了肉鸡（1~35日龄）的生长性能（P〈0.05）和组织（胸腺、肝脏、胸肌和腹脂）的相对重量（P〈0.05）,同时也降低了肉鸡胸肌的a值、抗氧化酶（过氧化氢酶CAT和谷胱甘肽过氧化物酶GSH-Px）的活力、三磷酸腺苷（ATP）和二磷酸腺苷（ADP）含量及能荷（EC）值,但是提高了肉鸡胸肌一磷酸腺苷（AMP）的含量（P〈0.05）。2日粮中添加0.5%的AKG降低了热应激肉鸡的料重比（1~35日龄）、胸肌AMP含量（P〈0.05）,提高了热应激肉鸡血液抗氧化酶（CAT、SOD和GSH-Px）的活力（P〈0.05）,胸肌ATP、ADP和腺苷酸池（TAN）的含量及EC值（P〈0.05）。因此,日粮中添加0.5%的AKG可以降低热应激肉鸡的料重比,提高血液的抗氧化能力,改善胸肌的能量代谢。

This study was conducted to investigate the effects of α-ketoglutarate（AKG） on growth per-formance, meat quality, antioxidative function, and energy metabolism of broilers under heat stress.Two hundred 1-day-old Cobb chickens were randomly divided into four groups（control group, heat-stress group, VC group, and AKG group）. Broilers in control group were fed the basal diet, and the VCand AKG groups were fed the basal diet supplemented with 0.025% vitamin C and 0.5% AKG, respec-tively. The feeding trial lasted for 35 days. The results showed that： 1 Compared with the controlgroup, heat-stress decreased the growth performance（P〈0.05）, as well as the activity of antioxidativeenzymes（CAT and GSH-Px）, the levels of ATP, ADP, and energy charge, and the relative weight of thy-mus, liver, breast muscle, and abdominal fat, but increased（P〈0.05） the AMP level. 2 Compared withthe heat-stress group diet supplemented with 0.5% AKG increased the activities of serum CAT, SOD,and GSH-Px（P〈0.05）, levels of ATP, ADP, TAN, and EC in breast muscle, but reduced the ratio offeed to gain, and AMP content of heat-stressed broilers（P〈0.05）. These results suggested that diet withsupplementation of 0.5% AKG can increase the antioxidant capacity and improve muscle energy metab-olism and feed conversion efficiency of broilersunder heat stress.