摘要
Abstract
This study was conducted to investigate the effects of essential oil mixture(EOM)on performance, egg quality, follicular development and serum reproductive hormone indices of laying hens. A total of 432 twenty?five?week?old healthy Hy?Line Brown laying hens with similar body weight and laying rate were ran?domly divided to 4 groups with 6 replicates per group and 18 birds per replicate. Hens in the control group were fed a corn?soybean meal basal diet, and the others in the experimental group were fed the basal diets supple?mented with 75,150 and 225 mg/kg EOM,respectively. The adaptation period lasted for 3 weeks and the for?mal period lasted for 12 weeks. The results showed as follows:1)the egg weight of 150 mg/kg EOM was sig?nificantly higher than that of control group(P<0.05). However,there were no significant differences in laying rate, feed intake, egg production and feed to egg ratio among all groups(P>0.05). 2)The Haugh unit of 75 and 150 mg/kg EOM groups was significantly higher than that of 225 mg/kg EOM group(P<0.05), the al?bumen height of 150 mg/kg EOM group was significantly higher than that of 225 mg/kg EOM group(P<0.05), the eggshell ratio of 225 mg/kg EOM group was significantly higher than that of other groups(P<0.05). However, there were no significant differences in shape index,eggshell color,eggshell thickness,egg?shell strength, yolk color,yolk ratio and albumen ratio among all groups(P>0.05).3)There were no signifi?cant differences on follicular development indices among all groups(P>0.05). 4)The serum progesterone content of 225 mg/kg EOM group was significantly higher than that of other groups(P<0.05). However, there were no significant differences on other serum reproductive hormone contents among all groups(P>0.05). In conclusion, dietary EOM can improve egg weight and albumen quality of laying hens, while it has little effect on the follicular development.关键词
蛋鸡/植物精油混合物/蛋品质/卵泡发育/生殖激素Key words
laying hens/essential oil mixture/egg quality/follicular development/reproductive hormone分类
农业科技
