1. A factor in breeding efficiency in dairy cattle;Clapp,1937
2. Relation of postpartum interval to pituitary gonadotropins, ovarian follicular development and fertility in beef cows;Graves;Wisconsin Agr. Exp. Sta. Res. Bull.,1968
3. Relation of postpartum interval to pituitary gonadotropins, ovarian follicular development and fertility in dairy cows;Saiduddin;Wisconsin Agr. Exp. Sta. Res. Bull.,1968
4. Effect of lactation and energy intake on postpartum ovarian activity in the cow;Oxenreider;J. Anim. Sci.,1971
5. Effects of early weaning on exogenous hormone treatment on bovine postpartum reproduction;Smith;J. Anim. Sci.,1972