添加黑麦草饲粮对鹅肉脂肪酸组成的影响

Effects of Adding Different Amount of Rye Grass on Fatty Acid Compositions in Geese Diets

本研究旨在观察饲粮中添加不同比例多花黑麦草（Lolium multiflorum Lam）对鹅肉脂肪酸组成影响,揭示牧草摄食量与鹅肉α-亚麻酸（ALA）相对含量之间的关系。选用50羽14日龄长乐灰鹅,分成5个处理,饲养期60d。各处理饲粮中黑麦草干物质比例分别为：0.00%（CK）,5.42%,11.92%,19.52%和27.24%。结果表明：随着饲粮中黑麦草比例的提高,鹅肉ALA相对含量显著增加,试验各组分别比对照组增加了86.90%,197.24%（P〈0.05）,393.10%（P〈0.05）和304.83%（P〈0.05）;PUFA/SFA显著上升（P〈0.05）;n-6PUFA/n-3PUFA显著下降（P〈0.05）。鹅肉ALA相对含量与饲粮中黑麦草比例的曲线回归模型方程为：y=0.270＋0.106x-0.002x2（F=22.99＊＊）。当饲粮中黑麦草的干物质比例在0%~26.50%时,鹅肉ALA的含量呈上升趋势;当黑麦草的比例超过26.50%时,鹅肉ALA的含量转而呈下降趋势。说明黑麦草中的ALA能够通过摄食消化过程沉积到鹅肉中。

This study aims to examine the effects of adding different amounts of rye grass（Lolium multiflorum Lam）to geese diets on the fatty acid compositions of goose meat.A positive correlation between rye grass intake andα-linolenic acid（ALA）contents of goose meat was found（P〈0.05）.Fifty Changle Grey Geese of 14-day-old were chosen and tested for five different treatments with growing period of 60days（d）.The proportions of DM of rye grass in the geese diets for the different groups were 0.00%（CK）,5.42%,11.92%,19.52% and 27.24%,with respect to Group I,II,III and IV.The results showed that the ALA content of the goose meat increased significantly with increasing rye grass proportion in diets.The increases of ALA contents in the goose meat ranged from 86.90%（Group I）,197.24%（Group II）,393.10%（Group III）and 304.83%（Group IV）（P〈0.05）compared with the CK Group.Polyunsaturated fatty acids/saturated fatty acids（PUFA/SFA）obviously increased,while n-6PUFA/n-3PUFA content decreased（P〈0.05）.Regression curve between the ALA content of goose meat and the rye grass component of diets was a quadratic equation.The DM components of rye grass in the diets ranged from 0%to 26.50%,ALA content of the goose meat showed increasing tendency.However,ALA content of the goose meat showed decreasing tendency when the rye grass components of the diet exceeded26.50%.In conclusion,the recommended maximum rye grass component in goose feed diet is 26.50%.These results indicate that the ALA content of rye grass can be incorporated into goose meat by metabolism processes.