Overview of Breeding Soundness Examination (BSE) of the Male Animal 

Definition: A systematic evaluation of a male's reproductive potential and ability to get females pregnant.

• Limitation: It is not a direct evaluation of fertility, which can only be confirmed by the production of offspring.

• Initial Steps: Requires proper animal identification and a detailed history, especially for sub- or infertile males.

Primary Components of the BSE

• General Physical Evaluation:

    ◦ Physical examination and inspection of genital organs.

    ◦ Scrotal Circumference (Ruminants): Measured to estimate daily sperm output and "serving capacity" (the number of females a bull or ram can impregnate).

• Behavioral Assessment:

    ◦ Evaluation of breeding ability and libido.

    ◦ Note: This is difficult to assess during routine collections via electroejaculation.

• Breeder Classification:

    ◦ Satisfactory: Meets all criteria.

    ◦ Questionable: Potential issues found.

    ◦ Unsatisfactory: Assigned if the animal has inherited physical defects, such as cryptorchidism.

Ancillary (Advanced) Sperm Tests

• Membrane Integrity:

    ◦ Evaluated using Eosin stain (non-viable sperm turn pink/red) or fluorescent probes like SYBR-14 and propidium iodide.

• DNA Integrity:

    ◦ Sperm Chromatin Structure Assay (SCSA): Uses acridine orange to detect if sperm DNA can withstand acid denaturation.

• Functional Assessments:

    ◦ Tests for capacitation, acrosomal exocytosis, and the ability to bind to or penetrate the oocyte.

• Constraints: These tests require high expertise and specialized facilities and are rarely used in routine clinical BSEs.