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Chpt7_ANS3319BovineBSELab_10 - ANS 3319C Reproductive...

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ANS 3319C Reproductive Physiology & Endocrinology Lab Semen Collection & Breeding Soundness Exam in Bull Objectives 1) Provide an introduction to the Breeding Soundness Exam in beef bulls, which includes a physical examination, scrotal circumference measurement, and collection of semen. 2) Provide students “hands-on experience” in collecting semen and conducting a Breeding Soundness Exam (BSE) in beef bulls. What is a Breeding Soundness Exam? The BSE is a prognostication of a bull’s ability to get cows pregnant and is typically performed on bulls that are used for natural service. The BSE consists of three major examination categories: 1) Overall physical exam. 2) Examination of the reproductive genitalia. 3) Semen evaluation. A BSE is typically performed under three situations: 1) Pre-purchase sale 2) Pre-breeding season exam: 30 to 60 days prior to start of breeding season. 3) Post-breeding season exam: if the owner suspects fertility problems. Guidelines for BSEs have been established by the Society of Theriogenology, which is the branch of veterinary medicine that deals with reproduction. Physical Examination Health Eyes are clear of any lesions - pinkeye and squamous cell carcinomas. Oral examination - adequate number of teeth to graze and eat forage. General health should be good. Body Condition Excessively fat bulls lack vigor and the excess fat may negatively affect sperm production. Excessively thin bulls may not have the stamina to service cows during the breeding season. Therefore, bulls must carry some extra weight at the start of the breeding season. Conformation and Body Structure Rear leg conformation is very important. Rear legs are load bearing during mounting and copulation. Necessary for proper mobility around the breeding pasture. Hooves are in good shape and don’t need trimming. Remember that structural faults are heritable. Genital Examination Prepuce Should be palpated for adhesions, inflammation, and abscesses. Cattle of Bos indicus and Bos indicus x Bos taurus breeding: Predisposed to preputial injury or prolaspe, which is the result of very loose, pendulous preputial development (Figure 1) . Bos taurus /naturally polled bulls: Eversion (preputial prolaspe) of penis (1 - 10 cm). Bulls are predisposed to preputial injury due to physical trauma or frostbite (Figure 2) . Preputial problems lead to: Phimosis – inability to extend penis through the prepuce. Paraphimosis – inability to retract penis through the prepuce.
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ANS 3319C Reproductive Physiology & Endocrinology Lab - Semen Collection & Breeding Soundness Exam in Bull 2 Figure 1. A very pendulous development of the prepuce, which predisposes to preputial lesions (left) compared with a more desirable conformation (right) in Bos indicus .
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Chpt7_ANS3319BovineBSELab_10 - ANS 3319C Reproductive...

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