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Genetic parameters for semen quality and quantity traits in five pig lines
Journal of Animal Science
|November 7, 2017
Summary
Genetic parameters for boar semen traits were estimated, showing moderate heritability for traits like sperm motility and morphology. This suggests selection for improved semen quality and uniformity in breeding goals is feasible.
Area of Science:
- Animal Genetics
- Reproductive Biology
- Quantitative Genetics
Background:
- Semen quality and quantity are critical for boar reproductive efficiency.
- Understanding genetic variation in semen traits is essential for effective breeding programs.
- Within-boar variation of semen traits also impacts reproductive success.
Purpose of the Study:
- To estimate genetic parameters for key boar semen traits.
- To assess the genetic basis of within-boar variation in semen quality.
- To evaluate the suitability of these traits for inclusion in pig breeding goals.
Main Methods:
- A multiple-trait (4x4) repeatability animal model was used across 5 pig lines.
- Semen traits analyzed: sperm motility (MOT), progressive motility (PROMOT), sperm count (lnN), and abnormalities (ABN).
- Within-boar variation analyzed using multiple-trait (2x2) for SD and AVG, and single-trait for CV.
Main Results:
- Average heritabilities ranged from 0.16 (lnN) to 0.22 (PROMOT).
- Favorable genetic correlations were found between MOT and PROMOT, and negative correlations with ABN.
- For within-boar variation, AVG generally showed higher heritability than SD and CV.
Conclusions:
- Moderate heritabilities suggest effective selection for boar semen quality is possible.
- Semen traits can be considered for inclusion in breeding goals.
- Average (AVG) and standard deviation (SD) of semen traits are recommended for selection regarding uniformity.
