Theriogenology · 1998 · 90 citations · 19 references
AgricultureAnimal SciencesDairy ScienceLactationEstrous CycleEstrus DetectionRuminant Reproductive MedicineBeef Cattle Estrus SynchronizationDairy Cow Estrus DetectionEstrus Detection By UltrasoundEstrus PredictionEstrus Scoring Systems
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Australian Veterinary Journal · 1976 · 943 citations
Radioimmunoassay of Plasma Progesterone
Guy E. Abraham, Ronald S. Swerdloff, Dan Tulchinsky et al. · The Journal of Clinical Endocrinology & Metabolism · 1971 · 680 citations
A.L. Johnson · Poultry Science · 1987 · 225 citations · Full text