title: Forty years of control of the oestrous cycle in ruminants: progress made, unresolved problems and the potential impact of sperm encapsulation technology.
abstract: Pharmacological control of the oestrous cycle may, with or without sperm encapsulation, remain an indispensable part of any attempt to make artificial insemination available to the ranch-cattle industry. Of the current methods, those most likely to remain acceptable with regulatory agencies and to gain acceptance with industry are those involving the short-term use (7-10 days) of minimal effective doses of progestins (preferably progesterone) and the subsequent use of an analogue of prostaglandin F2 alpha. The use of microencapsulated sperm with a long lifespan would allow artificial insemination to be achieved without reference to the time when heat and ovulation may occur.
authors.forename: W
authors.initials: W
authors.lastname: Jöchle
mesh_terms: D000818:Animals; D004971:Estrus / Q000502:physiology*; D004973:Estrus Synchronization; D005260:Female; D006801:Humans; D007315:Insemination, Artificial / Q000379:methods / Q000662:veterinary*; D008297:Male; D012418:Ruminants / Q000502:physiology*; D013094:Spermatozoa / Q000502:physiology*