Indicadores de desempenho em rebanho da raça Holandesa: curvas de crescimento e altura, características reprodutivas, produtivas e parâmetros genéticos

Val, J. E.; Freitas, María; Oliveira, Henrique Nunes de; Cardoso, Victor José Mendes; Machado, Paulo Fernando; Paneto, J. C. C.

doi:10.1590/s0102-09352004000100014

Cited by 9 publications

(14 citation statements)

References 6 publications

(3 reference statements)

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“…The heritability estimates for FCI (0.13 to 0.14) were not affected by the inclusion of short lactations; however, it showed slight superiority when model b was used. The values obtained in the present study were superior to those obtained by Val et al (2004), which were 0.10 for the Holstein breed; and Facó et al (2008), which were 0.05 for the Girolando breed, but inferior to the value obtained by Bertipaglia et al (2007) with Holstein cows (0.19).…”

Section: Discussioncontrasting

confidence: 85%

Effect of inclusion or non-inclusion of short lactations and cow and/or dam genetic group on genetic evaluation of Girolando dairy cattle

Canaza-Cayo¹,

Silva²,

Cobuci³

et al. 2016

Genet. Mol. Res.

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ABSTRACT. The objective of this study was to evaluate the effects of inclusion or non-inclusion of short lactations and cow (CGG) and/or dam (DGG) genetic group on the genetic evaluation of 305-day milk yield (MY305), age at first calving (AFC), and first calving interval (FCI) of Girolando cows. Covariance components were estimated by the restricted maximum likelihood method in an animal model of single trait analyses. The heritability estimates for MY305, AFC, and FCI ranged from 0.23 to 0.29, 0.40 to 0.44, and 0.13 to 0.14, respectively, when short lactations were not included, and from 0.23 to 0.28, 0.39 to 0.43, and 0.13 to 0.14, respectively, when short lactations were included. The inclusion of short lactations caused little variation in the variance components and heritability estimates of traits, but their non-inclusion resulted in the re-ranking of animals. Models with CGG or DGG fixed effects had higher heritability estimates for all traits compared with models that consider these two effects simultaneously. We recommend using the model with fixed effects of CGG and inclusion of short lactations for the genetic evaluation of Girolando cattle.

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Section: Discussioncontrasting

confidence: 85%

Effect of inclusion or non-inclusion of short lactations and cow and/or dam genetic group on genetic evaluation of Girolando dairy cattle

Canaza-Cayo¹,

Silva²,

Cobuci³

et al. 2016

Genet. Mol. Res.

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“…The Richards and Brody models have generally proved to be the most adequate, although for the Frisian x Zebu genetic groups the Von Bertalanffy and Richards models have proved to be more suitable (Perotto et al, 1992;Val et al, 2004). Oliveira et al (2000) and Garnero et al (2005) concluded that the Brody, Von Bertalanffy, logistic and the Gompertz models are adequate to describe the growth of Zebu females, with the Von Bertalanffy model being the most suited for Guzerá females and the Brody model for Nelore females.…”

Section: Introductionmentioning

confidence: 99%

Genetic trends in the expected progeny difference of the asymptotic weight of Nelore females

et al. 2006

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There are few studies on weight covering the full life cycle of Zebu cattle, and there is no entire growth description or mean growth pattern for animals belonging to this breed. In order to provide such data, 1,158 Nelore females born between 1985 and 1995 were weighed 14,563 times from birth to full growth maturity, in ten herds spread over seven Brazilian states. The Von Bertalanffy, Brody, logistic and Gompertz non-linear models were used to obtain the asymptotic weights (A) and the maturation rates (K). The (co)variance and breeding value components for A and K were obtained by using the multiple trait derivative free restricted maximum likelihood method under the animal model. Genetic trends were calculated in function of the mean expected progeny differences (EPD) for the trait (A or K) divided by the number of animals according to their year of birth. The genetic trends of the expected progeny difference with reference to the date of birth of the cows were, on average, -6.5g y -1 for A and 2.0g y -1 for K, close to zero as confirmed by the low (0.0023 to 0.003) coefficient of regression values. The curve parameters are recommended as a selection criterion to reach precocity and avoid adult weight increase in the female herd.

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“…Tabela 30 -Ganho de peso e erro padrão das médias para os quatro tratamentos Fibro 0,10 (0,11) 0,47 (0,06) 0,46 (0,10) 0,37 (0,10) Galv 0,11 (0,12) 0,58 (0,07) 0,43 (0,11) 0,41 (0,10) Tela -0,05 (0,11) 0,59 (0,06) 0,58 (0,10) 0,28 (0,10) Test -0,13 (0,11) 0,47 (0,06) 0,56 (0,10) 0,36 (0,10) A curva de crescimento dos bovinos em relação à idade, assim como dos mamíferos em geral, apresenta uma forma sigmóide com duas fases distintas: uma de aceleração, desde a fecundação até a puberdade e outra de desaceleração da puberdade até a maturidade (LUCCI, 1989;DOMINGUES, 1995;VAL et al, 2004). O peso final alcançado pelo animal irá variar em função do padrão genético, nutricional e sanitário.…”

Section: Análise Produtiva (Ganho De Peso)unclassified

“…Animais criados em pastagem apresentam, em geral, um ganho de peso inferior aos animais confinados. Embora existam relatos de até 0,8kg.dia -1 (FANÁTICO, 2000), estes são valores difíceis de serem alcançados (MACHADO, 2004).…”

Section: Análise Produtiva (Ganho De Peso)unclassified

“…Os animais estudados apresentavam dois padrões genéticos distintos e duas faixas etárias (Tabela 2 item 2.2.4). Pode ser observado que alguns animais apresentavam peso inicial inferior ao recomendado pela literatura para se alcançar o primeiro parto aos 26 meses, ou seja, peso de 180kg aos 9 meses de idade, o que exigiria um ganho diário médio de 0,50kg a 0,60kg (MACHADO 2004). No entanto, a maioria das novilhas poderia se enquadrar dentro da expectativa de um parto aos 28 meses, com peso ao parto entre 490kg e 520kg para os animais da raça holandesa e peso intermediário entre 340kg a 490kg para as novilhas mestiças, com ganhos diários de 0,45kg (SANTOS, 2002).…”

Section: Análise Produtiva (Ganho De Peso)unclassified

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Avaliação da influência do sombreamento artificial no desenvolvimento de novilhas leiteiras em pastagens

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À Sarah razão da minha existência. Aos meus pais, Ezequiel e Maria Rosa, que não só me deram a vida, como constantemente me ensinam a desfrutá-la com muita fé e muita força. Aos meus irmãos, Anita, Elizabete, André, Adolfo e Ezequiel, com os quais sempre posso contar. Dedico. 4 5 AGRADECIMENTOS A Deus que sempre me conduz pelo caminho certo, mesmo quando eu teimo em querer seguir pelo errado. Ao meu Orientador Iran José Oliveira da Silva, pela confiança, oportunidade e exemplo.Flávia e tantos outros sem os quais eu não poderia ter realizado este trabalho.À Solange Sabadin por conseguir transmitir uma sensação de confiança e carinho.Aos colegas do NUPEA: Maurício, Mi,

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Indicadores de desempenho em rebanho da raça Holandesa: curvas de crescimento e altura, características reprodutivas, produtivas e parâmetros genéticos

Cited by 9 publications

References 6 publications

Effect of inclusion or non-inclusion of short lactations and cow and/or dam genetic group on genetic evaluation of Girolando dairy cattle

Effect of inclusion or non-inclusion of short lactations and cow and/or dam genetic group on genetic evaluation of Girolando dairy cattle

Genetic trends in the expected progeny difference of the asymptotic weight of Nelore females

Avaliação da influência do sombreamento artificial no desenvolvimento de novilhas leiteiras em pastagens

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