The Effect of Adding Composite Probiotics on the Growth Performance,Gut microbiota,and Serum Biochemical Indicators of Different Breeds of Fattening Cattle
This experiment selected 12 individuals and divided them into 3 groups Group A(Angus)♂X Ka-zakh cow ♀)、Group B(Holstein Bulls)♂X Kazakh cow ♀)、Group C(Simmental Cattle)♂X Kazakh cow♀).Each group consists of 4 cows,with a weight of 468.38±38.46 kg for different breeds of fattening cattle.The effect of adding compound probiotic preparations(CPP)to the feed was measured during the regular feeding period on the growth performance,gut microbiota,serum biochemical indicators,and economic benefits of each group of cattle.Weighing was conducted on the 0th and 75th day of the regular feeding period.In terms of daily weight gain between different groups,the experimental group A showed a significant difference(P＜0.05)com-pared to group C,and a highly significant difference(P＜0.01)in weight gain compared to group B.However,there was no significant difference(P＞0.05)between group B and group C;Experiment C had the lowest weight gain cost,while Experiment A had the highest gross profit and could achieve the maximum economic benefits.Fe-cal samples were collected at 0d and 75d during the normal feeding period to analyze the changes in gut microbiota abundance.The results showed that there were no significant differences(P＞0.05)in Firmicutes,Bacteroidata,Spriochaeteota,and Actinobacteria among the three groups;There was a significant difference(P=0.025)in Pa-tescibacteria between experimental group A and group B.The changes in bacterial abundance before and after feed-ing CPP during the main feeding period were as follows:the difference in patellar bacterial phylum between the ex-perimental group A and the control group was extremely significant(P=0.003);The detection of Bacteroidetes showed significant differences(P＞0.01)between Group B and Group C.The results showed that the addition of CPP significantly increased the proportion of beneficial bacteria,regulated the microbial community structure,and improved the fattening effect of beef cattle.Blood biochemical indicators showed that there were no significant differences in the levels of alanine aminotransferase(ALT),aspartate aminotransferase(AST),alkaline phospha-tase(ALP),lactate dehydrogenase(LDH),creatinine(CREA),and urea nitrogen(BUN)among the three groups of cattle(P＞0.05),indicating that feeding basal diet+CPP had no significant effect on the liver and kidney function of each group of cattle.The total protein(TP)content in experimental group B was significantly higher than that in group A and the difference was significant(P＜0.05).The triglyceride(TG)content in exper-imental group B was significantly different from that in groups A and C(P＜0.05),while there was no significant difference between group A and C(P＞0.05);This indicates that Heha F1 has strong protein synthesis ability and lipid absorption ability.
fattening cattle with different combinationscomposite probioticsgrowth performanceIntestinal floraserum biochemical indicator
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