influência das coletas sistemáticas e parciais na seleção de codornas por meio de curvas de probabilidade de postura influence of systematic and partial collections on quail selection through curves of laying probability

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ID: 137957
2010
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Abstract
Neste trabalho, objetivou-se verificar se a seleção é influenciada pela observação parcial da postura de ovos em vez da observação da postura diária total. No primeiro estágio de análises, por meio de um modelo bayesiano, consideraram-se como características analisadas os parâmetros da curva de probabilidade de postura em um modelo de efeitos aleatórios com função de ligação logística. No segundo estágio do procedimento, foram obtidas estimativas de componentes de covariância e parâmetros genéticos. Observou-se superestimação dos parâmetros da curva média de produção da amostra total nas coletas sistemáticas (coletadas 1 vez a cada 14 dias, 1 ou 2 vezes a cada 7 dias) e parciais (nos 15, 30, 45, 60, 75 e 90 dias consecutivos). Para o parâmetro que representa o início da postura (a), os valores de herdabilidade foram 0,54; 0,14; 0,12 e 0,07 e, para aquele que representa a evolução da postura (β), 0,36; 0,37; 0,40 e 0,47, respectivamente, nas coletas sistemáticas e total. Nas coletas parciais e total, respectivamente, os valores foram 0,04; 0,03; 0,06; 0,12; 0,17 e 0,25; 0,25; 0,33; 0,33; 0,32; 0,41 e 0,51. Nas coletas sistemáticas, à medida que os valores de herdabilidade para o parâmetro que representa o início da postura decresce, o outro cresce, no entanto, à medida que o tamanho amostral aumenta nas coletas parciais, os valores crescem para ambos os parâmetros. Dos 100 melhores animais classificados de acordo com um índice de seleção ponderado, a correlação entre os escores dos animais selecionados nas subamostras e a amostra total é baixa (entre -0,13 e +0,13) e indica que o índice de seleção utilizado é afetado.
This study aimed to verify if the selection is influenced by partial observation of laying instead of observation of total daily posture. On the first state of analyses, through a Bayesian model, it was considered as analyzed characteristics the parameters of laying probability curve in a model of random effects with function of logistic connection. On the second stage of the procedure, it was obtained the estimatives of (co)variance components and genetic parameters. It was observed an overestimation of the production mean curve for the total sample in systematic collections (collected once every 14 days, 1 or 2 times every 7 days) and partial (on 15, 30, 45, 60, 75 and 90 consecutive days). For the parameter that represents the beginning of laying (a), the heritability values were 0.54; 0.14; 0.12 and 0.07; and for the parameter that represents the laying evolution (β), they were; 0.36; 0.37; 0.40 and 0.47, respectively, in the systematic and total collections. In partial and total collections, respectively, the values were 0.04; 0.03; 0.06; 0.12; 0.17 and 0.25; 0.25; 0.33; 0.33; 0.32; 0.41 and 0.51. In the systematic collections, as heritability values for the parameters that represent the beginning of laying decreases, the other increases; however, as the sample size increases in partial collections, the values increase for both parameters. Within the top 100 animals classified according to a mediated selection index, the correlation among the scores of selected animals in the sub-samples and the total sample is low (from -0.13 to 0.13) indicating that the used selection index is affected.
Reference Key
rossi2010revistainfluncia Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors ;Robson Marcelo Rossi;Elias Nunes Martins
Journal european journal of lipid science and technology
Year 2010
DOI
10.1590/S1516-35982010000800011
URL
http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982010000800011
Keywords
overweight Adolescent bayesian analysis criança sobrepeso child obesity foods and food supply

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