Correlações genéticas entre medidas de perímetro escrotal e características produtivas e reprodutivas de fêmeas da raça Nelore

Boligon, Arione Augusti; Rorato, Paulo Roberto Nogara; Albuquerque, Lúcia Galvão de

doi:10.1590/s1516-35982007000300007

Cited by 56 publications

(56 citation statements)

References 18 publications

(21 reference statements)

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“…The CV estimated for the traits studied were of low magnitude, except for T (41.15%) and ADC (49.59%), whereas the CV for AFC (12.47%) was close to the reported value by Boligon et al (2007) for Nellore cattle (10.13%). The low CV values for SC and YA could be due to the short calving season.…”

Section: Discussionsupporting

confidence: 68%

“…The heritability estimate for AFC (0.23 6 0.08) was higher than those reported by Boligon et al (2007) and Grossi et al (2008) for Nellore cattle (0.14 in both studies). On the basis of these heritability estimates, we can expect that the response to selection for sexual precocity using SC of Nellore animals participating in this breeding program would be much higher and faster than the response to the other traits.…”

Section: Discussioncontrasting

confidence: 67%

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Genetic parameters and environmental effects on temperament score and reproductive traits of Nellore cattle

Barrozo

Buzanskas

Oliveira

et al. 2012

Animal

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Animal temperament is a trait of economic relevance and its use as a selection criterion requires the identification of environmental factors that influence this trait, as well as the estimation of its genetic variability and interrelationship with other traits. The objectives of this study were to evaluate the effect of the covariates dam age at calving (ADC), long yearling age (YA) and long yearling weight (YW) on temperament score (T) and to estimate genetic parameters for T, scrotal circumference (SC) at long YA and age at first calving (AFC) in Nellore cattle participating in a selection program. The traits were analyzed by the restricted maximum likelihood method under a multiple-trait animal model. For all traits, contemporary group was included as a fixed effect and additive genetic and residual as random effects. In addition to these effects, YA, YW and ADC were considered for analyzing T. In the case of SC and AFC, the effect of long YW was included as a covariate. Genetic parameters were estimated for and between traits. The three covariates significantly influenced T. The heritability estimates for T, SC and AFC were 0.18 6 0.02, 0.53 6 0.04 and 0.23 6 0.08, respectively. The genetic correlations between T and SC, and T and AFC were 20.07 6 0.17 and 20.06 6 0.19, respectively. The genetic correlation estimated between SC and AFC was 20.57 6 0.16. In conclusion, a response to selection for T, SC and AFC is expected and selection for T does not imply correlated responses with the other traits.

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Section: Discussionsupporting

confidence: 68%

Section: Discussioncontrasting

confidence: 67%

Genetic parameters and environmental effects on temperament score and reproductive traits of Nellore cattle

Barrozo

Buzanskas

Oliveira

et al. 2012

Animal

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“…Entre as características indicadoras de fertilidade e precocidade sexual, a única amplamente empregada nos programas de melhoramento é o perímetro escrotal. Na raça Nelore, as estimativas de herdabilidade para o perímetro escrotal variam de 0,25 a 0,53 (Boligon et al, 2007;Yokoo et al, 2007).…”

Section: Introductionunclassified

“…Entretanto, selecionar diretamente as fêmeas quanto à menor idade ao primeiro parto não é simples, pois as características reprodutivas geralmente têm baixa herdabilidade, entre 0,14 e 0,19 (Pereira et al, 2002;Boligon et al, 2007). Além disso, alguns produtores atrasam a entrada de fêmeas na reprodução ao determinarem idade ou peso para início da vida reprodutiva, o que dificulta a identificação das fêmeas sexualmente precoces.…”

Section: Introductionunclassified

Correlações genéticas entre escores visuais e características reprodutivas em bovinos Nelore usando inferência bayesiana

Boligon

Albuquerque

2010

Pesq. agropec. bras.

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Resumo -O objetivo deste trabalho foi estimar a herdabilidade e as correlações genéticas entre escores visuais e características reprodutivas de animais da raça Nelore. As características avaliadas foram: precocidade, musculatura, e escores de conformação à desmama (PD, MD e CD, respectivamente) e ao sobreano (PS, MS e CS, respectivamente); idade ao primeiro parto (IPP); e perímetro escrotal (PE). Termos para indexação: conformação, idade ao primeiro parto, musculatura, perímetro escrotal, precocidade. Genetic correlations between visual scores and reproductive traits in Nelore cattle using Bayesian inferenceAbstract -The aim of this work was to estimate the heritability and the genetic correlations between visual scores and reproductive traits of Nelore cattle. The traits evaluated were: finishing, muscling, and conformation scores at weaning (PD, MD, and CD, respectively) and yearling (PS, MS and CS, respectively); age at the first calving (

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“…-E-mail: danisio@fcav.unesp.br Scrotal circumference (SC) measurements can also be used as selection criteria in programs aiming to improve production efficiency, since they present medium to high heritability (Quirino and Bergmann, 1998;Gressler et al, 2000;Pereira et al, 2000;Silveira et al, 2004) and favorable genetic associations with production traits (Moser et al, 1996;Cyrillo et al, 2001;Garnero et al, 2001) and reproductive traits (Martin et al, 1992;Gressler et al, 2000;Gianlorenço et al, 2003;Boligon et al, 2007). Furthermore, because SC is an easily measured trait and can be measured at young ages (weaning, 365 days of age and 550 days of age), this makes it possible to identify animals that are genetically superior in relation to these traits.…”

Section: Introductionmentioning

confidence: 99%

Heritability estimates and genetic correlations for body weight and scrotal circumference adjusted to 12 and 18 months of age for male Nellore cattle

Frizzas

Grossi

Buzanskas

et al. 2009

Animal

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Heritability estimates and genetic correlations were obtained for body weight and scrotal circumference, adjusted, respectively, to 12 (BW12 and SC12) and 18 (BW18 and SC18) months of age, for 10 742 male Nellore cattle. The adjustments to SC12 and SC18 were made using a nonlinear logistic function, while BW12 and BW18 were obtained by linear adjustment. The contemporary groups (CGs) were defined from animals born on the same farm, in the same year and birth season. The mean heritability estimates obtained using the restricted maximum likelihood method in bi-trait analysis were 0.25, 0.25, 0.29 and 0.42 for BW12, BW18, SC12 and SC18, respectively. The genetic correlations were 0.30 6 0.11, 0.21 6 0.13, 0.21 6 0.11, 20.08 6 0.15, 0.16 6 0.12 and 0.89 6 0.04 between the traits BW12 and BW18; BW12 and SC12; BW12 and SC18; BW18 and SC12; BW18 and SC18; and SC12 and SC18. The heritability for SC18 was considerably greater than for SC12, suggesting that this should be included as a selection criterion. The genetic correlation between BW18 and SC12 was close to zero, indicating that these traits did not influence each other. The contrary occurred between SC12 and SC18, indicating that selection using one of these could alter the other. Because of the mean magnitudes of heritabilities in the various measurements of weight and scrotal perimeter, it is suggested that the practice of individual selection for these traits is possible.

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Correlações genéticas entre medidas de perímetro escrotal e características produtivas e reprodutivas de fêmeas da raça Nelore

Cited by 56 publications

References 18 publications

Genetic parameters and environmental effects on temperament score and reproductive traits of Nellore cattle

Genetic parameters and environmental effects on temperament score and reproductive traits of Nellore cattle

Correlações genéticas entre escores visuais e características reprodutivas em bovinos Nelore usando inferência bayesiana

Heritability estimates and genetic correlations for body weight and scrotal circumference adjusted to 12 and 18 months of age for male Nellore cattle

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