Theoretical Basis for Genetic Parameters of Herd Life and Effects on Response to Selection
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TL;DR: Results of analytically derived formulas showed that estimates of heritability obtained from analysis of herd life are biased for survival, and measures of herdLife should be adjusted for production when included in selection strategies.
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About: This article is published in Journal of Dairy Science. The article was published on 01 May 1993. and is currently open access. The article focuses on the topics: Herd & Culling.
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References
The Method of Path Coefficients
TL;DR: The Method of Path Coefficients (MPC) as discussed by the authors is a flexible means of relating the correlation coefficients between variables in a multiple system to the functional relations among them, which has been applied in quite a variety of cases.
•Book
The Mathematical Theory of Quantitative Genetics
Michael Bulmer
- 01 Jan 1980
TL;DR: The theory of quantitative genetics bridges the gap between observable statistical properties of a character and the genetic and environmental factors which are thought to determine its expression as discussed by the authors, covering a wide range of genetic topics from Mendelian genetics to selection theory in breeding.
1K
Disease, production and culling in Holstein-Friesian cows: IV. Effects of disease on production
Ian R. Dohoo,S. Wayne Martin +1 more
TL;DR: Several disease conditions had a beneficial effect on milk production and this was attributed to the therapy provided to cows affected with these conditions, while all conditions related to reproductive performance had a detrimental effect on days to conception.
303
Estimating variances and covariances for multivariate animal models by restricted maximum likelihood
TL;DR: The extension to multivariate analyses, allowing for missing records, is described, a numerical example is given and simplifications for specific models are discussed.
Length of Productive Life of Dairy Cows. 2. Variance Component Estimation and Sire Evaluation
TL;DR: In this paper, the authors used Weibull models with time-dependent covariates to estimate the genetic component of the cow's true stayability and an approximation of her functional stayability.
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