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Effect of Birth Weight and Human Socialization on Reproductive Performance of Adult A.I. Boars.

By Nikhol Elizabeth Dysart

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The objective of this study was to examine the effect of birth weight and socialization prior to puberty on reproductive performance of A.I. boars. Twenty boars were randomly allocated to a factorial arrangement of treatments including birth weight (BW: High or Low) and socialization to humans (Socialized or Unsocialized). Boars were trained for semen collection at 150 days of age and then collected once weekly for 27 consecutive weeks. Socialization improved the training success (p < 0.05) and reduced the mounting time (p = 0.007) of Low birth weight boars, but had no effect on these same parameters in High birth weight boars (p > 0.21). Both birth weight (p < 0.001) and socialization (p < 0.001) had a positive effect on total sperm per ejaculate. High birth weight boars that were socialized averaged 77.0 + 2.8 billion compared to 54.1 + 1.9 billion for their low birth weight, unsocialized counterparts. Semen quality parameters including motility, mobility (CASA analyses) and morphology were not affected by either birth weight (p > 0.15) or socialization (p > 0.21). Results from this study indicate that sperm production in adult boars has a positive relationship with birth weight and can be increased further by socialization to humans during their prepubertal development without any detrimental effects on semen quality. In contrast, socialization appeared to enhance libido only in low birth weight boars.


Katie Carroll

Date 2014
Publisher North Carolina State University Libraries
Location of Publication Raleigh, North Carolina
Department Animal Science
Degree Master of Science
Language English
University North Carolina State University
Cite this work

Researchers should cite this work as follows:

  1. Animal roles
  2. Artificial insemination
  3. Birth
  4. Boars
  5. Farm animals
  6. Food animals
  7. Health
  8. Human social behavior
  9. Mammals
  10. performance
  11. Reproduction
  12. Swine