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2. The effect of lactation and season on sexual activity and synchronization of oestrus in lactating Karakul ewes;Boshoff,1980
3. Field trials in fixed time sheep A.I. in Ireland;Crosby,1984
4. Effect of progestagen/progesterone treatment on the induction of pregnancy in ewes;Crosby,1988
5. Effect of progestagenn treatments on the incidence of oestrus and pregnancy rates in ewes;Crosby;Anim. Reprod. Sci.,1991