8Soderquist L,M.H.Rodriguez,L.Janson.Post-thaw motility,ATP content and cytochrome C oxidase activity of A.I.bull spermatozoa in relation to fertility[J].J.Vet.Med.A.1991,38:165-174
9Kjaestad H,K.D.Ropstad,B.K.Andersen.Evaluation of spermatological parameters used to predict the fertility of frozen bull semen[J].Acta.Vet.Scand,1993,34:299-303
10Januskauskas A,L.Soderquist,M.G.Haard,et al.Influence of sperm number per straw on the post-thaw sperm viability and fertility of swedish red and white A.I.bulls[J].Acta.Vet.Scand,1996,37:461-470
