茶多酚对奶山羊生产性能、血液指标和抗氧化功能的影响

Effects of Tea Polyphenols on Performance, Blood Indexes andAntioxidant Function of Dairy Goats

本试验旨在研究茶多酚对奶山羊生产性能、血液指标和抗氧化功能的影响。选择24只体重、泌乳日龄、产奶量、胎次相近的健康西农萨能奶山羊,随机分成2组,每组4个重复,每个重复3只羊。对照组饲喂全混合日粮,试验组在全混合日粮中添加5.71 g/kg茶多酚。预试期10 d,正试期42 d。结果表明:1)饲粮中添加茶多酚对奶山羊的干物质采食量和产奶量无显著影响(P>0.05)。2)第21天和第42天,茶多酚组的乳中体细胞数显著低于对照组(P<0.05);第21天,茶多酚组的乳中尿素氮含量显著高于对照组(P<0.05)。3)第21天,茶多酚组的血清丙二醛含量显著低于对照组(P<0.05),血清总超氧化物歧化酶和谷胱甘肽过氧化物酶(GSH-Px)活性显著高于对照组(P<0.05)。第42天,与对照组相比,茶多酚组的血清GSH-Px活性有提高的趋势(P=0.065)。4)第42天,与对照组相比,茶多酚组的血清谷草转氨酶活性有提高的趋势(P=0.067)。5)第42天,茶多酚组的血液中嗜酸性粒细胞数量显著低于对照组(P<0.05)。综上所述,在本试验条件下,饲粮中添加茶多酚能降低乳中体细胞数,提高奶山羊的抗氧化功能。

This experiment was conducted to study the effects of tea polyphenols on performance,blood indexes and antioxidant function of dairy goats.Twenty-four healthy Xinong Saanen dairy goats with similar parity,lactation age,milk yield and body weight were randomly divided into 2 groups with 4 replicates in each group and 3 goats in each replicate.Goats in the control group was fed a total mixed ration,and others in the tea polyphenols group were fed a total mixed ration supplemented with 5.71 g/kg tea polyphenols.The pre feeding period was 10 days and the formal experimental period was 42 days.The results showed as follows:1)dietary tea polyphenols had no significant effects on dry matter intake and milk yield of dairy goats(P>0.05).2)On day 21 and day 42,the milk somatic cell count of tea polyphenols group was significantly lower than that of the control group(P<0.05);on day 21,the milk urea nitrogen content of tea polyphenols group was significantly higher than that of the control group(P<0.05).3)On day 21,the serum malondialdehyde(MDA)content of tea polyphenols group was significantly lower than that of the control group(P<0.05),and the activities of total superoxide dismutase and glutathione peroxidase(GSH-Px)in serum were significantly higher than those of the control group(P<0.05).On day 42,compared with the control group,the serum GSH-Px activity of tea polyphenols group had a tendency to increase(P=0.065).4)On day 42,compared with the control group,the serum glutamic-oxalacetic transaminase activity of tea polyphenols group had a tendency to increase(P=0.067).5)On day 42,the blood eosinophils number of tea polyphenols group was significantly lower than that of the control group(P<0.05).In conclusion,dietary tea polyphenols can decrease the milk somatic cell count and increase the antioxidant function of dairy goats under the conditions of this study.