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Testicular parameters and spermatogenesis in different birthweight boars
P A Auler1, G H F A Moreira2, C O Hogg3
1Biological Sciences Institute, Federal University of Minas Gerais, Av. Antônio Carlos 6627, 31.270-901, Belo Horizonte, MG, Brazil.
Reproduction, Fertility, and Development
|September 29, 2016
Summary
Higher birthweight boars exhibit enhanced testicular development and sperm production. This suggests birthweight is a critical factor for optimizing semen yield in artificial insemination programs.
Area of Science:
- Reproductive Biology
- Animal Science
- Spermatogenesis Research
Background:
- Birthweight is a significant factor influencing early development in many species.
- Understanding the impact of birthweight on male reproductive potential is crucial for livestock industries.
Purpose of the Study:
- To investigate the influence of birthweight on testicular development and sperm production in boars.
- To determine if higher birthweight correlates with improved spermatogenesis and potential semen yield.
Main Methods:
- Selection of littermate boars based on highest (HW) and lowest (LW) birthweight.
- Orchiectomy performed at 8 days and 8 months of age for comparative analysis.
- Assessment of body and testicular weights, testosterone levels, gene expression, and germ cell counts.
Main Results:
- HW boars demonstrated significantly higher body and testicular weights at both assessed ages.
- Neonatal testes of HW boars showed increased somatic and germ cell numbers.
- LW boars exhibited reduced pachytene spermatocytes and round spermatids at 8 months, leading to lower sperm production.
Conclusions:
- Higher birthweight positively impacts testicular somatic and germ cell development in boars.
- Birthweight influences spermatogenesis, with HW boars showing greater potential for sperm production.
- Selecting for higher birthweight boars could enhance semen production efficiency in artificial insemination.
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