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Milk coagulation properties are moderately heritable in dairy cows: a meta-analysis using the random-effects model
1Department of Animal Science, Faculty of Agricultural Sciences, University of Guilan, Rasht, Iran.
This meta-analysis shows additive genetic variation exists for milk coagulation properties (MCP) in dairy cows, suggesting potential for genetic selection programs. Improving MCP may have negligible effects on production traits.
Area of Science:
- Animal Genetics
- Dairy Science
- Quantitative Genetics
Background:
- Milk coagulation properties (MCP) are crucial for cheese production.
- Understanding the genetic basis of MCP is essential for dairy cow breeding programs.
- Previous studies have estimated genetic parameters for MCP, but a comprehensive synthesis is lacking.
Approach:
- A random-effects meta-analysis was conducted to synthesize published genetic parameter estimates for MCP.
- Data from 23 papers (1999-2020) including 80 heritability and 157 genetic correlation estimates were analyzed.
- Key MCP traits analyzed include rennet coagulation time (RCT), curd-firming time (k20), curd firmness (a30), titratable acidity (TA), and pH.
Key Points:
- Heritability estimates for RCT, a30, k20, TA, and pH were 0.273, 0.303, 0.278, 0.189, and 0.276, respectively.
- Significant genetic correlations were found between MCP traits (e.g., RCT-a30: 0.842, a30-pH: -0.396).
- Genetic correlations between MCP and production traits were generally low, indicating potential for independent selection.
Conclusions:
- Additive genetic variation for MCP exists in dairy cows, supporting their inclusion in selection goals.
- Moderate heritability of MCP and low genetic correlations with production traits allow for improvement with minimal negative correlated responses.
- Genetic selection for improved MCP is feasible without compromising milk production.
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