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Variance components due to direct and maternal effects for growth traits of Australian beef cattle
TLDR
Variance components for birth, weaning, yearling and final weight in Australian Hereford, Angus and Zebu Cross cattle were estimated by Restricted Maximum Likelihood and there were marked differences between breeds in the relative magnitude ofh2 and the maternal heritability, and the direct-maternal genetic correlation. Expand
WOMBAT—A tool for mixed model analyses in quantitative genetics by restricted maximum likelihood (REML)
  • K. Meyer
  • Computer Science, Medicine
  • Journal of Zhejiang University SCIENCE B
  • 1 November 2007
WOMBAT is a software package for quantitative genetic analyses of continuous traits, fitting a linear, mixed model; estimates of covariance components and the resulting genetic parameters areExpand
Random regression analyses using B-splines to model growth of Australian Angus cattle
  • K. Meyer
  • Biology, Medicine
  • Genetics Selection Evolution
  • 15 September 2005
TLDR
Analysis of weights of Australian Angus cattle from birth to 820 days of age showed good agreement for all ages with many records, but fluctuated where data were sparse, and analyses using B-splines appeared more robust against "end-of-range" problems. Expand
Estimates of covariance functions for growth from birth to 630 days of age in Nelore cattle.
TLDR
Weight records of Brazilian Nelore cattle, from birth to 630 d of age, recorded every 3 mo, were analyzed using random regression models and direct heritability estimates decreased after birth and tended to be lowest at ages at which maternal effect estimates tended to been highest. Expand
Estimating covariance functions for longitudinal data using a random regression model
  • K. Meyer
  • Biology
  • Genetics Selection Evolution
  • 15 May 1998
A method is described to estimate genetic and environmental covariance functions for traits measured repeatedly per individual along some continuous scale, such as time, directly from the data byExpand
Estimates of direct and maternal covariance functions for growth of Australian beef calves from birth to weaning
  • K. Meyer
  • Biology, Medicine
  • Genetics Selection Evolution
  • 15 September 2001
TLDR
Analysis of records for birth and subsequent, monthly weights until weaning on beef calves of two breeds in a selection experiment identified similar patterns of variation for both breeds, with maternal effects considerably more important in purebred Polled Herefords than a four-breed synthetic. Expand
Estimates of heritability and repeatability for reproductive traits in Australian beef cattle.
TLDR
Variance components and resulting heritabilities and repeatabilities were obtained by Restricted Maximum Likelihood, using a derivative-free algorithm, for a total of seven traits assuming an Animal Model, and variables describing cows' lifetime reproductive performance, were distinguished from traits pertaining to individual breeding seasons. Expand
Restricted maximum likelihood to estimate variance components for animal models with several random effects using a derivative-free algorithm
  • K. Meyer
  • Biology
  • Genetics Selection Evolution
  • 15 November 1989
TLDR
Estimates are obtained by evaluating the likelihood explicitly and using standard, derivative-free optimization procedures to locate its maximum by the so-called Animal Model, which includes the additive genetic merit of animals as a random effect, and incorporates all information on relationships between animals. Expand
Estimation of genetic and phenotypic covariance functions for longitudinal or ‘repeated’ records by restricted maximum likelihood
Abstract Covariance functions are the equivalent of covariance matrices for traits with many, potentially infinitely many, records in which the covariances are defined as a function of age or time.Expand
Genetic variation and covariation for growth, parasite resistance and heat tolerance in tropical cattle
TLDR
It was concluded that in reasonably adapted genotypes, selection for growth in the Australian tropics would result in improved heat tolerance and reduced resistance to parasites. Expand
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