Introduction

Controlling estrous cycles (day 0=onset of estrus) by synchronizing estrus facilitates artificial insemination (AI) or natural service of a high percentage of breeding age or postpartum females. As a result, it also facilitates promulgation of superior genetics of progeny-tested sires of economic worth for continued livestock improvement. Some methods are also used to delay or prevent estrus in females, induce puberty, or initiate estrous cycles in postpartum or seasonally anestrous females.

Various hormones have been tested to control the estrous cycle of domestic farm species. These include compounds that: 1) lyse the corpus luteum (CL); 2) artificially elongate the luteal phase via feeding, drenching, or injecting a progestin, or administering intravaginal sponges or inserts, or body implants that deliver a progestin; 3) induce ovulation using gonadotropins; or 4) induce ovulation using combinations of several hormones.

Pregnancy Guide

Pregnancy Guide

A Beginner's Guide to Healthy Pregnancy. If you suspect, or know, that you are pregnant, we ho pe you have already visited your doctor. Presuming that you have confirmed your suspicions and that this is your first child, or that you wish to take better care of yourself d uring pregnancy than you did during your other pregnancies; you have come to the right place.

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