Altura da garupa e sua associação com características reprodutivas e de crescimento na raça Nelore

Pereira, Murillo Ceola Stefano; Yokoo, M. J. I.; Bignardi, Annaíza Braga; Sezana, Juliana Cristina; Albuquerque, Lúcia Galvão de

doi:10.1590/s0100-204x2010000600011

Cited by 29 publications

(23 citation statements)

References 22 publications

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“…The posterior mean of direct heritability for hip height obtained in this study is close to those reported in the literature for Nelore cattle (Yokoo et al, 2007;Pereira et al, 2010). On the other hand, for the Brahman breed animals, Vargas et al (2000) reported higher values of direct heritability for weaning hip height and yearling hip height, with values of 0.73 and 0.87, respectively.…”

Section: Resultssupporting

confidence: 88%

“…However, recent studies have shown negative genetic correlation and with high magnitude between subsequent rebreeding of heifers and yearling weight, i.e., -0.66±0.05 (Pereira, 2008). According to Pereira et al (2010) and Boligon et al (2011), selection for higher weights or weight gains can lead to selection of animals with greater stature and size, which can be more demanding in terms of nutrition.…”

Section: Resultsmentioning

confidence: 99%

“…Selection for higher weight or weight gains may result, by correlated response, in increase in adult weight and size of the animals (Boligon et al, 2009;Pereira et al, 2010;Boligon et al, 2011), which can increase the maintenance requirements. Thus, in primiparous females, the substantial physiological demands as a result of lactation and growth can cause a reduction in conception rates.…”

Section: Introductionmentioning

confidence: 99%

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Genetic parameters and relationships between heifers rebreeding and hip height in Nellore cattle

Boligon

Albuquerque

2012

R. Bras. Zootec.

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-The objective of this study was to estimate heritability and verify the genetic correlations between heifers subsequent rebreeding with weaning hip height (WHH) and yearling hip height (YHH), using Bayesian inference. The (co)variance components and genetic parameters were estimated using an animal nonlinear (threshold) model for subsequent rebreeding and an animal linear model for WHH and YHH. The animal model included the contemporary group as the systematic effect and direct additive genetic and residual effects as random effects. Genetic maternal and maternal permanent environment effects were also considered in the model for WHH. Covariables considered were: rest period (linear effect), for subsequent rebreeding; animal age at measurement and age of cow at calving (linear and quadratic effects), for WHH and YHH. Direct heritability estimates were 0.14±0.04, 0.45±0.03 and 0.51±0.02 for subsequent rebreeding, WHH and YHH, respectively. For maternal effects, the heritability of WHH and the proportion attributed to the permanent environmental effect were 0.08±0.02 and 0.04, respectively. The posterior means of genetic correlations estimates between subsequent rebreeding with WHH and YHH were -0.16±0.05 and -0.21±0.04, respectively. Selection response for subsequent rebreeding of heifers would be low. Increase in the rate of subsequent rebreeding could be obtained with improvements in the management applied to heifers.The inclusion of hip height in selection indices, especially when measured at yearling, promotes small reduction in the rate of subsequent rebreeding of Nellore heifers.

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Section: Resultssupporting

confidence: 88%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Genetic parameters and relationships between heifers rebreeding and hip height in Nellore cattle

Boligon

Albuquerque

2012

R. Bras. Zootec.

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“…Este achado discorda de vários resultados descritos na literatura, como os de Martins Filho e Lôbo (1991), Gressler et al (2000) e Pereira et al (2000Pereira et al ( e 2001, que estimaram valores negativos para essas correlações genéticas, variando de -1,00 a -0,22, em bovinos Nelore. Contudo, Gressler et al (2000), Pereira et al (2000Pereira et al ( e 2001 e Pereira et al (2010) reportaram herdabilidades próximas de zero para IPP e PIEP, variando de 0,01 a 0,12; além disso, Martins Filho e Lôbo (1991) utilizaram o modelo touro e o método dos quadrados mínimos para estimação dos componentes de (co)variância, diferentemente do presente trabalho.…”

Section: Figura 1 Densidade Marginal a Posteriori Das Estimativas Deunclassified

Características reprodutivas e suas associações com outras características de importância econômica na raça Nelore

Yokoo¹,

Magnabosco²,

Rosa³

et al. 2012

Arq. Bras. Med. Vet. Zootec.

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RESUMOObjetivou-se com este trabalho estimar as herdabilidades (h 2 ) e as correlações genéticas (r g ) entre idade ao primeiro parto (IPP) e primeiro intervalo de partos (PIEP) e outras características como peso (PS) ao ano (A) e ao sobreano (S), altura do posterior (ALT) e perímetro escrotal (PE450) em animais da raça Nelore. Os parâmetros genéticos foram estimados em uma análise multicaracterística por modelo animal, utilizando-se a inferência bayesiana via algoritmo de "Gibbs Sampling". Os parâmetros genéticos estimados sugerem a existência de variabilidade genética para IPP (h 2 = 0,26), sendo que a seleção para a diminuição da IPP de fêmeas Nelore deve responder à seleção individual, sem causar antagonismo do valor genético dos animais para PS (r g = -0,22 (A) e -0,44 (S)) e PE450 (r g = 0,02). A seleção para a diminuição da IPP, no longo prazo, pode levar a um aumento da ALT dos animais, embora essa associação seja relativamente baixa (-0,35). A estimativa de herdabilidade a posteriori para a característica PIEP foi baixa, 0,11±0,03. As r g entre PIEP e as demais características estudadas indicam que a seleção para essas características de crescimento não afetará o PIEP Palavras-chave: altura do posterior, componentes de variância, correlação genética, herdabilidade, precocidade sexual = -0,22 (Y) and -0,44 (S)), and SC (r g = 0,02). The selection for the AFC in the long term could lead to an increase in the animal's frame, although this association is relatively low (-0.35 ABSTRACT Heritability (h 2 ) and genetic correlations (r g ) were estimated between reproductive traits such as age at first calving (AFC), first calving interval (FCI) and other economically relevant traits, i.e., weight (W) at year (Y) and at 18 months of age (S), scrotal circumference (SC), and hip height (HH) in

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“…Baker et al (1988) considered that hip height is the most convenient way to describe the skeleton size in beef cattle. Although Pereira et al (2010) found high positive correlations between growth traits and hip height, the authors concluded it had little influence on the reproductive performance of Nelore heifers. Those authors also found that hip height of heifers at weaning may be influenced by dam age.…”

Section: Discussionmentioning

confidence: 94%

Development and reproductive performance of Hereford heifers of different frame sizes up to mating at 14-15 months of age

et al. 2018

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-Body development and reproductive performance of a hundred forty-two 14 to 15-month-old heifers, classified at weaning according to frame size as small, medium, and large, were evaluated. The parameters evaluated were: body weight, hip height, body condition score, weight gain, ovarian activity, and pregnancy rate. At weaning, body weight and hip height were significantly different among frame scores, (small -133.0 kg, 92.2 cm; medium -158.5 kg, 96.6 cm; and large -185.2 kg; 100.2 cm). After weaning, heifers grazed together on natural pastures during the autumn and on ryegrass (Lolium multiflorum La.) during the winter and spring. Frame score differences remained until the beginning of the breeding season (BS), starting on average at 14 months of age. Weight gain between weaning and the beginning of BS was not different among frame scores (0.740 kg/day, on average). Body weights at the beginning of the BS were significantly different, of 255.7 kg (53.3% of the mature weight) for small heifers, 285.0 kg (59.4%) for medium heifers, and 307.6 kg (64.1%) for large heifers. Ovarian activity at the beginning of the BS was not different among the three groups. The average weight gain values during the BS of 0.492, 0.472, and 0.421 kg/day for small, medium, and large heifers, respectively, were significantly different. Pregnancy rates were not different among groups (small, 71.4%; medium, 76.4%; and large, 76.5%). Frame score did not influence the reproductive performance of heifers, but the small and medium heifers conceived 29 and 20 days earlier, respectively, than the large heifers.

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Altura da garupa e sua associação com características reprodutivas e de crescimento na raça Nelore

Cited by 29 publications

References 22 publications

Genetic parameters and relationships between heifers rebreeding and hip height in Nellore cattle

Genetic parameters and relationships between heifers rebreeding and hip height in Nellore cattle

Características reprodutivas e suas associações com outras características de importância econômica na raça Nelore

Development and reproductive performance of Hereford heifers of different frame sizes up to mating at 14-15 months of age

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