Effects of Betaine on serum biochemical indexes,immune indexes,inflammatory factors,milk yield and milk composition of dairy cows under heat stress
This experiment aimed to study the effect of Betaine on blood biochemical indexes,immune indexes,inflammatory factors,milk yield and milk composition of early lactating cows under heat stress.A total of 48 early lactating cows with similar age,parity,body condition were randomly divided into four groups,with 12 cows in each group,namely the control group,experimental group Ⅰ,experimental group Ⅱ,and experimental group Ⅲ.The experimental period was 30 days,and the serum biochemical indicators,immune indicators,inflammatory factors,milk yield,and milk composition of the cows were tested on the 0th,14th,and 30th days of the experiment.The results showed that on day 14 of the trial,the serum Glu levels in early lactation cows under heat stress in the experimental groups Ⅱ and Ⅲ were significantly higher than that in the control group by 5.73％,6.30％(P＜0.05);On day 30 of the trial,the levels of group Ⅰ,group Ⅱ,and group Ⅲwere significantly higher than those of the control group 5.68％,7.67％,7.39％(P＜0.05).On day 30 of the trial,the serum UREA levels in group Ⅱ and group Ⅲ were significantly lower than those in the control group by 15.73％,12.23％(P＜0.05).There was no significant difference in TC,TB,AST,and ALT(P＞0.05).On day 30 of the trial,the IgG levels in test group Ⅱ and test group Ⅲ were significantly higher than those in the control group by 7.74％,7.11％(P＜0.05).There were no significant difference in IgA and IgM(P＞0.05).on day 30 of the trial,IL-6 in the experimental group Ⅱ and experimental group Ⅲ significantly decreased in the control group by 8.38％,8.99％(P＜0.05).There was no significant difference in HP(P＞0.05).The analysis of average milk production and milk composition showed that on day 30 of the trial,the average milk production in group Ⅱ and group Ⅲ was significantly higher than that in the control group by 6.31％,5.17％(P＜0.05).There were no significant difference in milk fat,milk protein,lactose and somatic cell cells(P＞0.05).In conclusion,the addition of Betaine to the feed could improve the nutritional status of animals,promote protein metabolism,increase the level of immune indicators,reduce the level of inflammatory factors,and increase the milk yield for early lactating cows under heat stress.
Betainecowsearly lactationheat stressmilk production
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