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Reproductive Physiological Responses of Cattle to Exogenous Prostaglandin F₂ ^{1 ,2,}

Dairy Science Department, Institute of Food and Agricultural Sciences, University of Florida, Gainesville 32611

ABSTRACT

Introduction

Major limitations to artificial insemination in cattle are failure to detect estrus and improper timing of insemination. Various investigators have reported that prostaglandin F₂ (PGF₂) is luteolytic when administered to cattle with functional corpora lutea (12, 16, 27) and provides a potential means of ovulation control (5, 8, 12, 19). Lauderdale (17) and Hafs et al. (8) described a multiplicity of physiological and endocrine responses initiated by prostaglandin treatment in various species including the bovine.

Our purpose is to summarize work in our laboratory that further documents various physiological and endocrine responses to PGF₂ in cattle. The results represent various among and within animal responses to PGF₂ believed to be important in the development of an ovulatory control system.

The luteolytic dosage of PGF₂ is dependent on site of deposition. For example, 300 µg, 5 mg, and 30 mg of PGF₂ are luteolytic when administered by intraovarian, intrauterine (i.u.), intramuscular (i.m.) and/or subcutaneous routes, respectively (10, 12, 16, 21, 22, 23).

¹ Supported in part by a Biomedical Science Grant, National Institute of Health, Bethesda, MD 20014.

² Florida Agricultural Experiment Station Journal Series No. 8002.

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