Study on the regulation of Lactobacillus salivarius metabolite succinic acid on egg-laying performance and egg quality of laying hens
The present study aimed to analyze the effect and the underlying mechanism of Lactobacillus salivarius metabolite succinic acid on laying performance and egg quality of laying hens. A total of 108 Hy-line brown hens at the age of 450-day-old were chosen and randomly divided into four groups, one blank control group and three succinate groups with low dosage (25 mM), medium dosage (50 mM), and high dosage (100 mM). The chickens in the blank control group were fed with basal diet, while chickens in succinate groups were respectively fed with succinate at the dosages of 25 mM, 50 mM, and 100 mM for 14 consecutive days. At the end of the trial, the laying performance and egg quality were analyzed. Further, the duodenum was sampled for histological analysis. The results showed that (1)The number of days that daily egg-laying rate higher than the control group were 10 days, 8 days, and 7 days in low, medium, and high dosage groups, respectively. The overall egg-laying rate was respectively higher than the control group by 5.03％, 1.06％ and 1.85％ in the low, medium, and high dosage groups; (2)For egg quality, the albumen height in 25 mM and 50 mM groups were significantly higher by 33.51％ and 38.92％(P<0.01) than the control group, while higher by 13.87％(P>0.05) in 100 mM group when compared with the control group without a statistical significantly. Moreover, the eggshell strength and thickness in succinate groups were higher by 4.12％～10.26％(P>0.05) than the control group without a significant difference; (3)For intestinal mucosal histo-logical analysis, the villus height in the 25 mM group was significantly higher than the control group by 22.19％(P<0.05), and the vil-lus height/crypt depth(V/C) were significantly increased by 37.04％(P<0.05). Taken together, feeding succinate at the dosage of 25 mM during the later period of laying will improve laying performance and egg quality.
万方数据
维普
