Estudo de definição alternativa da probabilidade de permanência no rebanho para a raça Nelore

Marcondes, C. R.; Paneto, João Cláudio do Carmo; Bezerra, Luiz Antônio Framartino; Lôbo, Raysildo Barbosa

doi:10.1590/s1516-35982005000500016

Cited by 6 publications

(6 citation statements)

References 6 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Therefore, direct selection for STAY would not imply genetic gain in the population studied. Marcondes et al (2005) and Nieto et al (2007) obtained similar heritability estimates for Nelore and Canchim animals evaluated at 76 months of age using a sire model. A slightly higher heritability estimate (0.12) was reported by Silva et al (2003) for Nelore cows, considering STAY at six years of age and using an animal model.…”

Section: Heritabilitymentioning

confidence: 63%

“…Several studies on beef cattle have reported genetic parameter estimates for stayability using Bayesian inference in Nelore Marcondes et al, 2005;Van Melis et al, 2007), Canchim (Nieto et al, 2007) and Caracu (Queiroz et al, 2007). However, there are few studies that investigate relationships between stayability and body weight, scrotal circumference and age at first calving (Silva et al, 2006).…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Genetic associations between stayability and reproductive and growth traits in Canchim beef cattle

et al. 2010

View full text Add to dashboard Cite

Stayability is a trait that has a large impact on the costs of rural properties because it is directly related to the cow's ability to produce a certain number of calves over a given period of time. Thus, the objective of this study was to estimate the genetic variance of stayability (STAY) and its genetic associations with age at first calving (AFC), body weight of males and females at 420 days of age (BW420), and scrotal circumference at 420 days of age (SC420), in order to provide support for a genetic evaluation program on Canchim beef cattle. Genetic parameters were estimated by Bayesian inference using the THRGIBBS2F90 program, considering two-trait analysis between STAY and the other traits. A threshold model was established for STAY and a linear model was established for all other traits. The animal model included the contemporary group as the fixed effect and the genetic additive and residual effects as random effects. The heritability estimates and their respective standard deviations (in parentheses) obtained for STAY, AFC, BW420 and SC420 were 0.03 (0.01), 0.04 (0.01), 0.24 (0.04) and 0.24 (0.06), respectively. STAY presented genetic associations with AFC, BW420 and SC420 of − 0.63 (0.20), − 0.09 (0.11) and 0.45 (0.21), respectively. It had environmental correlations with AFC and BW420 of 0.02 (0.01) and − 0.06 (0.04). For SC420, the environmental covariance was set at zero. Selection for BW420 would not contribute towards improving STAY because the genes that acted on one trait did not act on the other. However, selection to increase SC420 should result in changes in this trait and also favor STAY. Despite the favorable genetic correlation estimates between AFC and STAY, the selection response for both traits would be low. Changes in management and environmental conditions could improve both traits.

show abstract

Section: Heritabilitymentioning

confidence: 63%

Section: Introductionmentioning

confidence: 99%

Genetic associations between stayability and reproductive and growth traits in Canchim beef cattle

et al. 2010

View full text Add to dashboard Cite

show abstract

“…Moreover, this trait shows low heritability and is therefore not commonly used as a selection criterion in beef cattle. Heritability values reported by [ 9 ] and [ 10 ] for STAY in Nellore cattle were 0.07 and 0.10, respectively.…”

Section: Introductionmentioning

confidence: 99%

Genomic analysis of stayability in Nellore cattle

et al. 2017

View full text Add to dashboard Cite

Stayability, which can be defined as the probability of a cow calving at a certain age when given the opportunity, is an important reproductive trait in beef cattle because it is directly related to herd profitability. The objective of this study was to estimate genetic parameters and to identify possible genomic regions associated with the phenotypic expression of stayability in Nellore cows. The variance components were estimated by Bayesian inference using a threshold animal model that included the systematic effects of contemporary group and sexual precocity and the random effects of animal and residual. The SNP effects were estimated by the single-step genomic BLUP method using information of 2,838 animals (2,020 females and 930 sires) genotyped with the Illumina High-Density BeadChip Array (San Diego, CA, USA). The variance explained by windows formed by 200 consecutive SNPs was used to identify genomic regions of largest effect on the expression of stayability. The heritability was 0.11 ± 0.01 when A matrix (pedigree) was used and 0.14 ± 0.01 when H matrix (relationship matrix that combines pedigree information and SNP data) was used. A total of 147 candidate genes for stayability were identified on chromosomes 1, 2, 5, 6, 9 and 20 and on the X chromosome. New candidate regions for stayability were detected, most of them related to reproductive, immunological and central nervous system functions.

show abstract

“…Usually the trait is analyzed by defining two categories, known as heifer pregnancy (Eler et al, 2004;Boligon, Albuquerque, 2011). However, a study with Nellore cattle argued that the use of polychotomous categories has a higher ability to detect genetic variation than the traditional binary approach (Marcondes et al, 2005).…”

Section: Introductionmentioning

confidence: 99%

Age at first calving of Nellore cattle in the semi-arid region of northeastern Brazil using linear, threshold, censored and penalty models

Malhado¹,

Malhado²,

Filho³

et al. 2013

Livestock Science

View full text Add to dashboard Cite

Estudo de definição alternativa da probabilidade de permanência no rebanho para a raça Nelore

Cited by 6 publications

References 6 publications

Genetic associations between stayability and reproductive and growth traits in Canchim beef cattle

Genetic associations between stayability and reproductive and growth traits in Canchim beef cattle

Genomic analysis of stayability in Nellore cattle

Age at first calving of Nellore cattle in the semi-arid region of northeastern Brazil using linear, threshold, censored and penalty models

Contact Info

Product

Resources

About