Induction of estrus in cattle by intraovarian injection of prostaglandin F2α

Abstract

An effective, reduced dosage ( 1 10 to 1 20 the systemic dose) method for administering prostaglandin F2α in heifers to induce estrus is presented in this study. The PGF2α was injected intraovarially in five heifers at a dose of 2 mg and in another five heifers at a dose of 1 mg. Five additional heifers were injected intraovarially with 0.5 ml of distilled water and served as the controls. Regression of the corpus luteum (CL) occurred in all PGF2α-treated heifers resulting in marked decline of the peripheral levels of progesterone 24 h after treatment. Estrus was expressed 1 to 3 d later. Regression of the CL, estrus, and decline in the peripheral levels of progesterone were not observed in the control heifers. Conception rates in the heifers given either 2 mg and 1 mg PGF2α were 60 and 100%, respectively. Seven calves were born at the end of the normal gestation period while one calf was aborted. © 1990.

Source or Periodical Title

Theriogenology

ISSN

0093691X

Page

511-521

Document Type

Article

Subject

estrus, heifers, intraovarian injection, PGF 2α

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