By Paul M Hocking

ISBN-10: 1845933753

ISBN-13: 9781845933753

This publication experiences the organic technology and heritage to breeding meat chook, in particular broiler, turkey and duck. those advertisement birds were replaced through genetic choice to such an quantity that they're considerably varied from conventional breeds and laying hens. overlaying technology, administration and husbandry structures, this entire textual content offers the freshest selection of papers at the subject from a variety of overseas specialists.

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Additional resources for Biology of Breeding Poultry (Poultry Science Symposium Series)

Example text

Social interactions occur among birds within a group and affect phenotypic values of birds. The phenotypic value of a bird will be the sum of a direct effect due to the individual itself and the social effects of the n − 1 other birds kept in the same group. Both the direct effect and the social effect may be decomposed into a heritable component, A, and a non-heritable component, E. 1, AD,i is the direct breeding value (DBV) of individual i, and AS , j the social breeding value (SBV) of its group member j.

4 shows that a negative genetic covariance between DBVs and SBVs ( σ ADS ) reduces the total heritable variation. With negative σ ADS , individuals with positive breeding values for their own phenotype (DBV) have, on average, negative social effects on the phenotypes of their group members (SBV). Thus negative σ ADS may be interpreted as ‘heritable competition’. Heritable competition, therefore, reduces the total heritable variation and thus the potential of the trait to respond to 2 σTBV 36 P.

The TPVi represents the total phenotypic effect of a bird on the trait values of its group (including itself), of which an amount ( AD,i + ED,i ) is expressed in its own phenotype and an amount ( AS,i + ES,i ) in the phenotypes of each of its n − 1 group members. 4, the variance of total phenotypic values is given by 2 2 2 σTPV = (σ A + σ E2 D ) + 2(n − 1)(σ ADS + σ EDS ) + (n − 1)2 (σ A + σ E2 S ). 9 shows that the limiting accuracy when using information of a large number of sib groups is identical to that in the classical case.

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