Covariance Genetic Estimates For Features Tabapuã Growth In Brazil
نویسندگان
چکیده
منابع مشابه
Estimates of genetic covariance functions for growth of Angus cattle.
Estimates of covariance functions and genetic parameters were obtained for growth of Angus cattle from birth to 820 days of age. Data comprised 84,533 records on 20,731 animals in 43 herds, with a high proportion of animals with 4 or more weights recorded. Changes in weights were modelled through random regression on orthogonal polynomials of age at recording. A total of 11 combinations of quad...
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The Tabapuã breed is a beef cattle Brazilian breed known for its sexual precocity and desirable characteristics for tropical conditions. However, this is a newly formed breed and few studies have been conducted regarding genetic parameters and genetic trends for its reproductive traits. The objective of the present study was to estimate the genetic parameters, genetic trends, and relative selec...
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INTRODUCTION Random regressions (RR) on Legendre polynomial (LP) of age have been used to model longitudinal data such as milk production and weights at different ages. Usually such models involve high degree polynomials, especially for direct permanent environmental effects and, consequently, a large number of parameters to be estimated. High order polynomials are associated with sampling prob...
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ژورنال
عنوان ژورنال: Nucleus Animalium
سال: 2016
ISSN: 1984-879X,2175-1463
DOI: 10.3738/21751463.1580