An osmotic resistance test for bovine semen

Quantification of bull sperm characteristics measured by computer-assisted sperm analysis (CASA) and the relationship to fertility

Subtle membrane changes in cryopreserved bull semen in relation with sperm viability, chromatin structure, and field fertility

Assessment of sperm quality through fluorometry and sperm chromatin structure assay in relation to field fertility of frozen-thawed semen from Swedish AI bulls

Comparison of methods to evaluate the plasmalemma of bovine sperm and their relationship with in vitro fertilization rate.

Nineteen young Hereford bulls were used to study the relationship between semen characteristics and fertility in artificial insemination following 15 320 inseminations. Seven measures of sperm motility, morphological abnormalities, the release of hyaluronidase, ATP content and sperm head measurements were examined as predictors of fertility (49-day fixed-interval non-return rate). Two assessments of motility, three categories of abnormal spermatozoa, acrosomal changes and the release of hyaluronidase had predictive power. Multiple regression analysis showed that a combination of sperm motility after dilution in saline, motility after thawing and the proportion of coiled tails and proximal protoplasmic droplets provided the best prediction of fertility and allowed bulls to be ranked in order of observed non-return rate (%) with a Spearman correlation better than +0.80.

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R. C. Shaw

Papers

Semen assessment, fertility and the selection of Hereford bulls for use in AI.