不同ω6/ω3多不饱和脂肪酸日粮对AA肉鸡脂多糖免疫应激的影响

Influence of Dietary Polyunsaturated Fatty Acids Ratios on the Immune Performance of AA Broilers Challenged with Lipopolysaccharide

选用90只AA肉鸡母雏,饲喂30∶1、20∶1、10∶1、5∶1、2.5∶1 5种不同的不饱和脂肪酸(PUFA)日粮到56日龄,进行大肠杆菌脂多糖(LPS)和生理盐水连续3 d注射应激,研究不同比例ω6/ω3 PUFA对免疫机能的影响。试验结果表明,不同比例ω6/ω3 PUFA对应激前后体增重、应激后第1 d和第7 d血清总蛋白(TP)和IgG含量没有显著影响(P>0.05),但对血清白蛋白(Alb)含量、应激后第1 d新城疫抗体滴度、第7 d血浆皮质酮含量有显著影响(P<0.05)。LPS应激和对照相比,除对体增重的影响达到显著水平(P<0.05)外,对其他性状的影响均未达到显著水平(P>0.05)。与应激后第1 d相比,应激后第7 d的皮质酮水平下降,白蛋白、总蛋白含量和IgG含量上升,表现出机体缓解应激的变化。因此,不同比例的ω6/ω3 PUFA日粮对机体体液免疫功能产生不同程度的影响,其中20∶1日粮的平均血清TP和Alb含量在5种日粮中最高,2.5∶1日粮的平均血清IgG含量和ND抗体水平在5种日粮中最高。但随着5种日粮ω6/ω3 PUFA比值的降低,日粮间缓解应激的作用没有呈现明显的变化趋势。

The effect of ω6/ω3 polyunsaturated acids （PUFA） ratios on the gain weight, immunological performance in Arber Acre （AA） broilers was investigated in this study. Total of ninty female birds were distributed across 5 treatment groups, which were supplemented with 30 t 1,20 ： 1,10 t 1,5 ： 1,2.5 ： 1 PUFA of ω6/ω3. At 56 days of age, each treatment was di- vided into two groups and chickens were injected with lipopolysaccharide （LPS） or saline for 3 days respectively. The results showed that no differences were found between the five supplementation （P〉0.05） in the following traits： the gain weighty the level of total protein （TP） and IgG （P〉0.05）. Significant differences occurred in albumin （Alb）, the antibody titre of New Castle Disease virus （ND） and cortisone concentration among the five dietary treatment. There was significant change in the gain weight between LPS and Saline treatments （P〈0.05）. The cortisone concentration of the first day was higher than that in the seventh day after injection. The reverse tendency was found for the level of IgG, TP and the Alb in the same time. Therefor,immune performance of AA broilers was influenced supplemented with ω6/ω3 PUFA. The average of TP and Alb in 20： 1 treatment and the antibody titre of ND in 2.5 ： 1 treatment were higher than other treatments.