Bovine Female Infertility Study Guide

Overview and Clinical Importance

Female bovine infertility represents a major economic concern in both beef and dairy operations. This comprehensive study guide covers three critical topics frequently tested on the NAVLE and BCSE: pregnancy diagnosis, cystic ovarian disease (follicular degeneration), and freemartinism. Understanding these conditions is essential for maintaining reproductive efficiency and herd productivity.

Reproductive failure in cattle causes significant economic losses through extended calving intervals, reduced calf crops, and the need to cull valuable animals. Early and accurate pregnancy diagnosis allows producers to identify open cows for timely rebreeding or culling decisions. Recognition of cystic ovarian disease enables appropriate hormonal intervention, while understanding freemartinism prevents retention of permanently sterile heifers as breeding stock.

Section 1: Pregnancy Diagnosis in Cattle

Early and accurate pregnancy diagnosis is crucial for reproductive management. The average gestation length in cattle is 280-283 days. Multiple methods exist for determining pregnancy status, each with specific advantages and timing considerations.