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Genetic parameters for stayability in Murrah buffaloes
Priscilla M Galeazzi1, Maria E Z Mercadante, Josineudson Aiiv Silva
1São Paulo State University - Animal Science Department - Jaboticabal-SP, Brazil.
The Journal of Dairy Research
|April 13, 2010
Summary
This study analyzed genetic factors influencing dairy buffalo longevity. Selecting for stayability in days to three years (STD3) can improve herd retention across different ages, benefiting breeding programs.
Area of Science:
- Animal Genetics
- Dairy Science
- Reproductive Biology
Background:
- Improving dairy buffalo breeding programs requires understanding genetic influences on longevity.
- Stayability is a key trait for herd retention and economic viability in dairy buffalo.
Purpose of the Study:
- To analyze the influence of genetic effects on the stayability of Murrah dairy buffaloes.
- To estimate heritability for different measures of stayability.
Main Methods:
- Analyzed data from 1016 Murrah buffaloes across nine herds in Brazil.
- Used statistical models including additive genetic effects and fixed effects (herd, birth year, season).
- Estimated additive effects for stayability as a trait (ST) and stayability in days (STD) using threshold and restricted maximum likelihood models.
Main Results:
- Heritability estimates for stayability in days (STD) were generally higher than for stayability trait (ST).
- Heritability for STD increased up to STD3 (0.40+/-0.10) and then decreased.
- Selection for STD3 showed potential to positively impact stayability at other ages.
Conclusions:
- Genetic selection for stayability in days, particularly for STD3, can enhance overall herd longevity in Murrah dairy buffaloes.
- These findings contribute valuable genetic insights for optimizing breeding strategies in Asian water buffalo populations.
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