NAVLE Reproductive

Bovine Male Infertility Study Guide

March 28, 2026 25 min read 37 views
Bull infertility represents a significant economic concern in beef and dairy production systems. Since a single bull is expected to breed 25-50 cows per breeding season, subfertility or infertility in even one bull can dramatically impact herd...

Overview and Clinical Importance

Bull infertility represents a significant economic concern in beef and dairy production systems. Since a single bull is expected to breed 25-50 cows per breeding season, subfertility or infertility in even one bull can dramatically impact herd reproductive efficiency. The Breeding Soundness Examination (BSE) is the cornerstone of bull fertility assessment and a critical skill for veterinary practitioners.

This study guide covers male infertility in bulls including the complete BSE protocol, causes of infertility, preputial diseases, and testicular pathology. Understanding these concepts is essential for NAVLE success and clinical practice.

Structure Function Clinical Relevance
Testes Sperm production (spermatogenesis), testosterone synthesis Scrotal location required for temperature 4-5 degrees C below body temperature; size correlates with sperm production
Epididymis Sperm maturation and storage; transport from testis to vas deferens Blockage causes infertility; epididectomy used for teaser bull preparation
Seminal Vesicles Secrete seminal fluid (largest volume contributor); activate sperm motility Palpated per rectum during BSE; vesiculitis is most common accessory gland pathology
Sigmoid Flexure S-shaped bend in penis; maintains penis within sheath when not breeding Most common site of penile hematoma (broken penis); held by retractor penis muscles
Prepuce/Sheath Protective covering for penis; everts during breeding Bos indicus breeds have longer, more pendulous sheath with higher injury risk

Bull Reproductive Anatomy Review

Understanding normal anatomy is essential for performing a thorough BSE and identifying abnormalities.

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