6Paterson J E.Macpherson A.A comparison of serum VitaminB12 and serum methylnlonic acid diagnostic measures of cobalt status in cattle[J].The Veterinary Record,1990(7):329-332
7Mburu-JN,Badamana-MS,Kamau-JMZ.Faecal and urinary losses of nitrogen in cobalt-deficient small East African goats[J].Indian Journal of Animal Science,1994,64:11,1 264-1 267
8NRC.Nutrient requirements of dairy cattle Seventh revised edition,2001
9Paterson J E.The influence of a low cobalt intake on the neutrophil function and severity of ostertagia infection in cattle[J].Br.Vet.J.,1990,146:519-530
10Makushenko N A,et al.Effect of some trace elements on biosynthesis of the B-group vitamins in the rumen of young bulls[J].N.Aband.Re.,1981(51)1:20
