Effects of compound probiotics supplied in dietary on growth performance,serum indexes and rumen fermentation performance of Simmental calves
This experiment was conducted to investigate the effects of probiotics in diet on growth,serum and rumen fermentation performance of Simmental calves.Eighteen 70-day-old Simmental calves with about same body weight were used.In the control group,calves were fed a basal diet.In the experimental groups,calves were fed the basal diet supplemented with 1.5 g and 3 g of probiotics,respectively.The pre-trial lasted for 7 d and the experimental lasted for 60 d.The results showed that:(1)The average daily gain(ADG)of group Ⅱ was significantly higher than control group by 18.31％(P＜0.05),but differences were not found in dry matter intake and feed efficiency among all groups(P＞0.05).(2)There were no significant differences in blood biochemical indices of alanine aminotransferase,aspartate aminotransferase,total protein,albumin,cholesterol and triglyceride(P＞0.05).The IgG and IL-6 of group Ⅱ was significantly higher than control group by 26.08％and 20.17％respectively(P＜0.05).Other immune indexes including immunoglobulin A,immunoglobulin M,interleukin-4 and interleukin-10 were not significantly different among all groups(P＞0.05).(3)Compared with control group,rumen ammonia nitrogen and butyric acid contents in trial group Ⅱwere significantly increased by 49.85％and 45.17％respectively,while acetic acid content was significantly decreased by 34.24％(P＜0.05).Other rumen fermentation parameters pH,propionic acid and isobutyric acid were not significantly different among groups(P＞0.05).In conclusion,supplementation of probiotics improved calves growth performance,enhanced immune function and improved rumen fermentation function of Simmental calves.In this experiment,it was more suitable to add 3 g/(head·d)compound probiotics.
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