Genetic evaluation of birth and weaning weight of Gudali and two-breed synthetic Wakwa beef cattle populations under selection in Cameroon: genetic and phenotypic parameters

Tawah, C. L.; Mbah, D.A.; Rege, J.E.O.; Oumate, H.

doi:10.1017/s0003356100006620

Cited by 19 publications

(32 citation statements)

References 16 publications

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“…At the same time, the effect of year of cows' birth on stayability to 3 yr was significant (P < 0.05). In agreement with the present study, Van der Westhuizen et al (2001) in South Africa reported the average calving success in a herd of beef cows retained to 36 mo of age varied from 1973 to 1991. There is a general lack of information on stayability patterns among Canadian herds of beef cattle.…”

Section: Resultssupporting

confidence: 93%

“…Again, animals born in winter and spring weighed less as yearlings than those born in the summer and fall. As expected, the influence of season in the genetic studies of the weight traits could vary according to management and climatic conditions (Assam and Nielsen 1987;Tawah et al 1993). Rege and Famula (1993) showed that the calves born in spring were the heaviest at birth and as yearlings, while those born in winter were heaviest at weaning.…”

Section: Resultssupporting

confidence: 53%

“…Rege and Famula (1993) showed that the calves born in spring were the heaviest at birth and as yearlings, while those born in winter were heaviest at weaning. Similarly, calves born in the wet season have been reported to be heavier than those born in the dry season (Tawah et al 1993). Calves born single were heavier at birth, weaning and 1 yr of age than twins or triplets.…”

Section: Resultsmentioning

confidence: 98%

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Genetic association between cows’ stayability to three years of age and juvenile growth traits in Canadian Angus herds

Rasali¹,

Crow²,

Shrestha³

et al. 2005

Can. J. Anim. Sci.

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. 2005. Genetic association between cows' stayability to three years of age and juvenile growth traits in Canadian Angus herds. Can. J. Anim. Sci. 85:139-143. Bivariate linear animal models were fit using MTDFREML programs for the analysis of cows' stayability to 3 yr (STAY3, n = 1, 703) as a binary scored trait paired with body weights at birth (BW, n = 6,116), 205-d weaning (WW, n = 5,360,) and 1 yr of age (YW, n = 5250) in Angus cattle. For STAY3, the model included a fixed effect due to herd × year of cow's birth along with a random direct genetic effect. For each of BW, WW and YW, the model included fixed effects due to herd × birth year, birth season, birth type, calf's sex and the age of dam (as linear and quadratic covariates), while the random effects were direct and maternal genetic effects and permanent maternal environmental effects. Survival analysis revealed that the risk of cows, 10 yr or less in age, being culled from five Canadian Angus herds was highest between 2 and 3 yr of age. The direct heritability (h 2 ) estimates for BW, WW and YW were 0.54, 0.73 and 0.47, respectively, and corresponding maternal heritability estimates were 0.14, 0.33 and 0.13, respectively. Furthermore, the direct h 2 estimate for STAY3 from three bivariate analyses was 0.23-0.

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Section: Resultssupporting

confidence: 93%

Section: Resultssupporting

confidence: 53%

Section: Resultsmentioning

confidence: 98%

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Genetic association between cows’ stayability to three years of age and juvenile growth traits in Canadian Angus herds

Rasali¹,

Crow²,

Shrestha³

et al. 2005

Can. J. Anim. Sci.

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“…In other words, selection on the base of animal's milk yield will subsequently decrease the maternal performance. Similarly, Tawah et al (1993) reported that the negative correlations between additive and maternal effects may reflect the adaptation of animals to a dry tropical environment. In addition, negative direct and maternal genetic correlations may suggest that both additive and maternal effects could be selected for breeding programs.…”

Section: Models Comparison and Rankingmentioning

confidence: 98%

A Comparison of Linear Models for Estimating Co-Variance Components and Genetic Parameters in Holstein Dairy Cattle

Shalaby

Moawed

2015

Journal of Animal, Poultry & Fish Production

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The objective of this study was to compare four different statistical models for genetic evaluation of some traits of Holstein-Friesian dairy cattle raised in Egypt. Data were collected from Alexandria Copenhagen Company; a commercial dairy herd located in Egypt on Cairo-Alexandria desert road, and represented 2846 first three lactation records pooled from cows having 60 sires and 428 dams. The studied traits were; days open (DO), 305-days milk yield (305-DMY), fat yield (FY) and protein yield (PY). Models were discriminated according to random effects fitted in each model. The random effects were; direct additive genetic effects of animals, maternal additive genetic effects, permanent environmental effects, together with the covariance between direct and maternal genetic effects, and residuals. Comparisons of statistical models were based on (AG) Log Likelihood values and estimates of genetic parameters of traits. Co-variance components and genetic parameters were estimated with VCE-6 software package. Heritabilities obtained from all models were ranged from (0.07 to 0.10), (0.24 to 0.32), (0.25 to 0.42) and (0.24 to 0.33) for DO, 305-DMY, FY and PY, respectively. Also, for all traits, the best-fitted model was characterized by the highest Log Likelihood value, the highest maternal heritability and the existence of direct-maternal genetic covariance. Estimated breeding values (EBVs) showed high variations with positive spearman's rank correlations (≥ 0.83) among models. This study showed that the inclusion of maternal effects with direct-maternal genetic covariances in the statistical models for genetic evaluations would improve the current herd genetically.

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“…Ainda mais discutíveis são as estimativas de correlação entre os efeitos direto e materno, publicadas para as características de crescimento, principalmente até um ano de idade, como pode ser visto nas características: peso ao nascimento e ao desmame, em que Tawah et al (1993) encontraram os valores de -0,93 e -0,68, respectivamente; peso aos 365 dias, em que Eler et al (1994) Existe o desafio de se desenvolver metodologias efetivas para comparar, e possivelmente combinar, informações de trabalhos relacionados, a fim de se realizar alguma inferência confiável sobre determinado tema. Assim, é crescente o número de estudos sobre a implementação e a melhoria de procedimentos estatísticos para a aplicação da metanálise, cujo trabalho pioneiro, no Brasil, foi efetuado por Giannotti et al (2002).…”

Section: Introductionunclassified

Metanálise bayesiana de parâmetros genéticos para características de crescimento em bovinos de corte

Giannotti

Packer²,

Mercadante

et al. 2006

Pesq. agropec. bras.

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Resumo -Foi conduzida uma metanálise, sob enfoque bayesiano, em um conjunto de estimativas de herdabilidade, para características de crescimento em bovinos de corte de raças indianas, com 869 estimativas de herdabilidade de efeito direto, 186 estimativas de herdabilidade de efeito materno e 123 estimativas do coeficiente de correlação genética entre os efeitos direto e materno. A construção e o desenvolvimento de um modelo hierárquico possibilitam a obtenção de estimativas combinadas de herdabilidade para as características peso ao nascimento, peso ao desmame, peso aos 365 dias e peso aos 550 dias, cujos valores são, respectivamente: 0,31, 0,24, 0,28 e 0,33 para efeitos diretos; 0,09, 0,13, 0,12 e 0,05 para efeitos maternos; e -0,16, -0,16, -0,20 e -0,16 para as correlações entre esses efeitos. A metanálise conduzida sob enfoque bayesiano mostrou-se bastante adequada, uma vez que um modelo hierárquico considera as variâncias dentro e entre os estudos, e sua implementação e condução são facilitadas em virtude, principalmente, do avanço conseguido na área computacional.Termos para indexação: inferência bayesiana, estimativas combinadas, herdabilidade, correlação genética. Bayesian meta-analysis of genetic parameters for growth traits in beef cattleAbstract -Bayesian meta-analysis was performed in a data set of heritability estimates for growth traits of zebu beef cattle with 869 direct heritabilities, 186 maternal heritabilities, and 123 direct-maternal genetic correlation. The fitting and development of a hierarchical model made possible to obtain pooled heritability estimates for birth weight, weaning weight, weight at 365 days of age and weight at 550 days of age, whose values were, respectively: 0.31, 0.24, 0.28 e 0.33 for direct effects; 0.09, 0.13, 0.12 e 0.05 for maternal effects; and -0.16, -0.16, -0.20 e -0.16 for direct-maternal genetic correlation. Meta-analysis conducted under Bayesian framework was adequate, since hierarchical model considers between-study and within-study variances, and its implementation and conduction are facilitated, mainly, due to the advance in computational area.

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Genetic evaluation of birth and weaning weight of Gudali and two-breed synthetic Wakwa beef cattle populations under selection in Cameroon: genetic and phenotypic parameters

Cited by 19 publications

References 16 publications

Genetic association between cows’ stayability to three years of age and juvenile growth traits in Canadian Angus herds

Genetic association between cows’ stayability to three years of age and juvenile growth traits in Canadian Angus herds

A Comparison of Linear Models for Estimating Co-Variance Components and Genetic Parameters in Holstein Dairy Cattle

Metanálise bayesiana de parâmetros genéticos para características de crescimento em bovinos de corte

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