Mieszany model oceny wartosci hodowlanej w programach genetycznego doskonalenia drobiu miesnego

• Autorzy: Wezyk S , Szewczyk A. , Jankowski J. , Szwaczkowski T.
• Języki publikacji: PL

Abstrakty

EN

Evaluation of the breeding value of poultry includes the results of performance and progeny testing. In pedigree flocks of egg-laying and meat-type hens and ducks, the breeder's attention is focused on the performance of progeny, parents, grandparents and collateral relatives (full- and half-sibs). In the case of geese and turkeys, where birds of different age are kept in the same fleck, the evaluatin includes also the reproductive performance in first, second and third seasons of reproductive utilization. Much attention has been paid to statistical models for estimation of progeny value. Modern meat-type poultry breeding programs generally have a sequential structure in which evaluation of growth traits and slaughter value in the first stage is followed by the evaluation of reproductive traits after the birds have attained the sexual maturity. Multiple trait genetic evaluation makes it possible to overcome selection bias and prevents the depression of the genetic progress in the population. In genetic evaluation, the estimating of variance matrices requires the use of ANOVA-type procedures which may yield heavily biased results. When an analysis includes all the necessary data for making selection decisions, the Restricted Maximum Likelihood (REML) method applied in the Individual Animal Model (IAM) can alleviate an undesirable selection bias. This method is very useful when the computations involve large numbers of birds. The paper discusses basic statistical procedures used for estimating the breeding value of meat-type poultry, with special regard to the BLUP-AM model; the ways of estimating genetic variance components and of predicting genetic effects; and the advantages and disadvantages of the methods for estimating the breeding value of poultry.

Słowa kluczowe

PL

Model Zwierzecia; indeksy selekcyjne; hodowla zwierzat; genetyka zwierzat; drob; wartosc hodowlana; ocena wartosci hodowlanej; metody oceny

• Wydawca: -
• Czasopismo: Postępy Nauk Rolniczych
• Rocznik: 2002
• Tom: 49
• Numer: 2
• Opis fizyczny: s.81-102,bibliogr.

Twórcy

autor

Wezyk S

• Instytut Zootechniki, 32-083 Balice k.Krakowa

autor

Szewczyk A.

autor

Jankowski J.

autor

Szwaczkowski T.

Bibliografia

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