3[1]Robinson T J.Use of progestagen-impregnated sponges inserted intravaginally or subcutaneously for the control of the oestrous cycle in sheep[J].Nature,1965,206:39.
4[2]Cunningham J M N,Deas D W,Fitzsimons J.Synchronisation of oestrus in ewes[J].The Veterinary Record,1967,80(20):590-591.
5[3]Reynolds James E F.Martindale(the Extra Pharmacopoeia)21st.ed.London:Royal Pharmaceutical Society,1996.1306-1307.
6[4]Mohan B K,Yie W C.Intravaginal controlled administration of flurogestone acetate Ⅱ.Development of an in vitro system for studying the intravaginal release and permeation of flurogestone acetate[J].Journal of Pharmaceutical Sciences,1984,73(10):1464-1468.
7[5]Killian D B,Kiesling D O,Warren J E Jr.Lifespan of corpora lutea induced in eatrous-synchronized cycling and anestrous ewes[J].J Anim Sci,1985,61(1):211-215.
8[6]Quinlivan T D.The relationship between numbers of spermatozoa inseminated and fertilization rate of ova in ewes treated with fluoro-progestagen intravaginal sponges in summer and autumn[J].J Reprod Fert,1970,23:87-102.
9[7]Ainsworth L,Wolynetz M S.Synchronization of estrus and reproductive performance of ewes treated with synthetic progestogens administered by subcutaneous ear implant or by intravaginal sponge pessary[J].Cana J Anim Sci,1982,54(6):1120-1127.
10[8]Shrestha J N B,Ainsworth L,Heaney D P.Influence of breed on the reproductive performance of ewes treated with fluorogestone acetate impregnated intravaginal sponge and pregnant mare serum gonadotropin during the breeding season[J].J Anim Sci,1983,63(1):1-6.
