母牛补饲维生素E和硒对新生犊牛生长和免疫的影响

本试验选择年龄、胎次、体况评分、顸产期相近的中国荷斯坦奶牛40头,随机分成2组,一组自由舔饲维生素E富硒舔砖,一组不补饲舔砖,研究维生素E(VE)和硒对新生犊牛生长和免疫的影响.试验期90 d,从预产前60 d到产后30 d.结果表明,试验组母牛血清中VE的含量在产后12 h显著高于对照组(P<0.05),血清中硒的含量在产前30 d和产后12 h高于对照组,差异极显著(P<0.01).试验组母牛分娩后12 h,血清中IgG、IgM的含量,初乳中IgM、IgG、IgA的含量都显著高于对照组(P<0.05).试验组犊牛出生后12 h,血清中VE和硒含量极显著高于对照组(P<0.01),IgG、IgA的含量高于对照组,差异显著(P<0.05).试验组犊牛初生体质量和体尺显著高于对照组(P<0.05),30日龄体质量和体尺高于对照组,差异极显著(P<0.01).试验组犊牛的发病率比对照组降低了50%.

Effects of supplementary vitamin E and selenium for cows on growth and immune of neonatal calves

Firty Holstein cows with similar age,parity,body condition and the expected calving period were randomly allotted into 2 treatments(control and treatment)to evaluate the effects of vitamin E and selenium on growth and immune of neonatal calves.Cows in treatment licked the brick enriching vitamin E and selenium ad libitum,and cows in control did not feed brick.Experimental period lasted 90 d from 60 d before expected calving to 30 d postpartum.Serum content of vitamin E at 12 h postpartum,is obviously higher in treatment cows than that of control(P<0.05).At 30 d prepartum,12 h postpartum the serum of content of selenium in treatment cows significantly increased compared with control(P<0.01).Serum contens of IgG and IgM at 12 h postpartum and the colostrum content of IgM,IgG and IgA in of treatment were significantly higher(P<0.05)than those of control.The content of vitamin E and selenium in serum of calves from treament was significantly higher than that from control(P<0.01).Meantime,at 12 h postpartum,the content of IgG and IgA in serum of calves form treatment was significantly higher than that form control(P<0.05).For birth and post-birthing 30 d,weight and body measurement of calves from treatment markedly increased compared with control(P<0.0 1).and incidence of diseases of calves was decreased by 50% than control.