Richardson, A M Characteristics of estrus before and after first insemination and fertility of heifers after synchronized estrus using GnRH, PGF2alpha, and progesterone. [electronic resource] - Journal of animal science Nov 2002 - 2792-800 p. digital Publication Type: Journal Article ISSN: 0021-8812 Standard No.: 10.2527/2002.80112792x doi Subjects--Topical Terms: AnimalsCattle--physiologyDinoprost--pharmacologyEstrus--drug effectsEstrus DetectionEstrus SynchronizationFemaleFertility--drug effectsGonadotropin-Releasing Hormone--pharmacologyInsemination, Artificial--veterinaryPregnancyPregnancy RateProgesterone--bloodRandom AllocationReproduction--drug effects