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Genetic parameters and alternatives for evaluation and ranking of Nellore young bulls in pasture performance tests

Breno de Oliveira Fragomeni et al · Sociedade Brasileira de Zootecnia · 2013

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Author / responsible party
Breno de Oliveira Fragomeni et al
Publisher
Sociedade Brasileira de Zootecnia
Year
2013
ISSN
1806-9290
ISSN
1806-9290
Language
English
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A survey of dairy calf management practices in some producing regions in Brazil

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The objective of this study was to estimate (co)variance components for weight at 550 days, average daily gain and an index with both traits, and to compare alternatives for evaluation and ranking of Nellore young bulls in pasture performance tests. The heritability estimates were 0.73, 0.31 and 0.44 for weight at 550 days, average daily gain and index, respectively. Animals were ranked according to their predicted breeding values or the phenotypic deviations in relation to the mean of the test. Although the correlations between breeding values and phenotypic deviations were high, there were differences in the number of animals selected in common when the selection criteria were the predicted breeding values or the phenotypic deviations. Mixed models are more appropriate than the least squares method and should be utilized in the evaluation of young bulls in performance tests.

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APA 7

al, B. D. O. F. E. (2013). Genetic parameters and alternatives for evaluation and ranking of Nellore young bulls in pasture performance tests. https://doi.org/10.1590/S1516-35982013000800004

MLA

al, Breno de Oliveira Fragomeni et. "Genetic parameters and alternatives for evaluation and ranking of Nellore young bulls in pasture performance tests." 2013. https://doi.org/10.1590/S1516-35982013000800004.

Chicago

al, Breno de Oliveira Fragomeni et. 2013. "Genetic parameters and alternatives for evaluation and ranking of Nellore young bulls in pasture performance tests.". https://doi.org/10.1590/S1516-35982013000800004.

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al, B. D. O. F. E. 2013, Genetic parameters and alternatives for evaluation and ranking of Nellore young bulls in pasture performance tests, Sociedade Brasileira de Zootecnia, available at: https://doi.org/10.1590/S1516-35982013000800004 [Accessed 7 Aug. 2026].

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Title
Genetic parameters and alternatives for evaluation and ranking of Nellore young bulls in pasture performance tests
Author / contributors
Breno de Oliveira Fragomeni et al
Publisher
Sociedade Brasileira de Zootecnia
Publication year
2013
ISSN
1806-9290
ISSN
1806-9290
Language
English

Subjects

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breeding value; heritability; least square; mixed models; selection
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