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Multivariate models for estimating jackass semen production and quality.

Qing Liu1, Jie Yu2,3, Min Li3

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Season and age do not impact donkey semen quality. However, multivariate models using reproductive organ measurements can accurately predict progressive motility and total sperm count in jackasses.

Keywords:
accessory sex glandsdonkeygonadsmodelsemen qualityultrasonography

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Area of Science:

  • Reproductive biology
  • Animal science
  • Veterinary medicine

Background:

  • Semen quality is crucial for successful artificial insemination in livestock.
  • Understanding factors influencing jackass (donkey) semen quality is vital for breeding programs.
  • Previous research has not fully elucidated the impact of season, age, and reproductive organ parameters on jackass semen characteristics.

Purpose of the Study:

  • To analyze the effects of season, age, gonad, and accessory sex glands on jackass semen characteristics.
  • To develop multivariate regression models for predicting jackass semen quality.
  • To investigate the relationship between reproductive organ size and semen parameters.

Main Methods:

  • Semen characteristics of 30 mature donkeys (1,014 ejaculations) were analyzed across autumn, spring, and summer.
  • Gonad and accessory sex gland parameters of 12 jackasses were measured via ultrasonography.
  • Multivariate regression models were constructed using testis circumference, cauda epididymis cross-sectional area, spermatic cord long axis, and sperm abnormality percentages.

Main Results:

  • Semen, gonad, and accessory sex gland parameters were not significantly affected by season or age.
  • Progressive motility showed a positive correlation with the long axis of the spermatic cord and a negative correlation with sperm abnormality.
  • Total sperm count correlated positively with testis circumference and cauda epididymis cross-sectional area.

Conclusions:

  • Established multivariate models accurately predict progressive motility, total sperm count, and functional sperm count in jackasses.
  • These models offer a reliable method for assessing and predicting jackass semen quality.
  • Reproductive organ measurements are valuable predictors of semen quality in donkeys.