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Genetic variation in head morphometry of rabbit sperm
R Lavara1, J S Vicente, M Baselga
1Universidad Politécnica de Valencia, Instituto de Ciencia y Tecnología Animal, Camino de Vera, Valencia, Spain. rlavara@dca.upv.es
Theriogenology
|June 18, 2013
Summary
Sperm head dimensions in rabbits are heritable and genetically correlated with daily weight gain. These findings suggest potential for improving rabbit breeding programs by considering sperm morphometry alongside growth traits.
Area of Science:
- Animal Breeding and Genetics
- Reproductive Biology
- Quantitative Genetics
Background:
- Sperm head morphometry is a key indicator of male fertility.
- Understanding the heritability and genetic correlations of sperm traits is crucial for selective breeding.
- Daily weight gain (DG) is a primary economic trait in rabbit production.
Purpose of the Study:
- To assess the repeatability and heritability of rabbit sperm head dimensions (width, area, length, perimeter).
- To investigate the genetic relationships among sperm head traits.
- To explore the genetic correlations between sperm head characteristics and daily weight gain (DG).
Main Methods:
- Analysis of 12,908 DG records from a rabbit paternal line.
- Evaluation of 1795 ejaculates from 283 males.
- Six sets of three-trait analyses were conducted using pedigree data from 14,700 animals.
Main Results:
- Sperm head dimensions exhibited heritability estimates ranging from 0.2 to 0.29.
- High positive genetic correlations (0.72–0.90) were observed among sperm traits, except for length-width.
- Consistent negative genetic correlations were found between DG and sperm head characteristics (e.g., -0.43 for width-DG).
Conclusions:
- Rabbit sperm head dimensions are heritable traits.
- Sperm morphometry is genetically linked to growth traits, with negative correlations suggesting potential trade-offs.
- Further research is recommended to link sperm morphometry with field fertility and prolificacy.
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