Genetics of Growth and Reproduction in the Turkey

Nestor, Karl E.

doi:10.3382/ps.0560337

Cited by 85 publications

(28 citation statements)

References 22 publications

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“…Arthur and Abplanalp (1975) reported an average value of +0.03 for this correlation. After a few generations of selection for either increased BW or egg production, however, this association becomes strongly negative (Nestor, 1977(Nestor, , 1980b …”

Section: Genetic Parametersmentioning

confidence: 99%

Multivariate restricted maximum likelihood estimation of genetic parameters for production traits in three selected turkey strains*

Chapuis¹,

Tixier-Boichard²,

Delabrosse³

et al. 1996

Genet. Sel. Evol.

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Summary -Genetic parameters related to growth, carcass composition and egg production were estimated on three (two female and one male) commercial strains of turkey using the method of restricted maximum likelihood (REML). In order to account for the sexual dimorphism in turkeys, body weight (BW, measured at 12 and 16 weeks of age) was considered as a sex-limited trait. As many as seven traits were analyzed simultaneously in one strain. Egg numbers were normalized using a Box-Cox transformation. Three different genetic models were used.

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Section: Genetic Parametersmentioning

confidence: 99%

Multivariate restricted maximum likelihood estimation of genetic parameters for production traits in three selected turkey strains*

Chapuis¹,

Tixier-Boichard²,

Delabrosse³

et al. 1996

Genet. Sel. Evol.

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“…Taking into account a considerable increase in the body weight of turkey hens in G 12 and G 13 (Table 1) in comparison with previous generations (Jankowski, 1989;Baran, 1993,), it can be concluded that the breeding methods used in this strain (breeding value estimation, selection and mating) turned out to be efficient. This conclusion is proved by the results of the research by McCartney et al (1968), Nestor (1971Nestor ( , 1977aNestor ( , 1977bNestor ( , 1980Nestor ( , 1984 and Nestor et al (1985) conducted in various turkey strains. These authors, through selecting turkeys for increasing the body weight of different age birds, obtained an increase in the value of this trait accompanied by a worsening of egg production, egg fertility or hatchability.…”

Section: Methodsmentioning

confidence: 80%

Improving the reproductive traits of turkey hens with regard to toms selection

Wawro¹,

Jankowski²,

Faruga³

1996

J. Anim. Feed Sci.

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1210 turkey hens from generation 12 (G 12 ) and 737 from generation 13 (G 13 ) of the maternal female strain J-44 were investigated. The male parents of the toms chosen to selection flocks in G 12 and G 13 were evaluated by means of a selection index including reproductive performance of their female relatives: mothers, sisters and half-sisters. The hens, in turn, were selected taking into account the results of the evaluation of the value in use and breeding value of their mothers according to the SELECT system. It has been found that the used breeding methods aiming at increasing the reproductive traits value in strain J-44 hens turned out to be efficient. The achieved breeding gain amounted to 10.2 of eggs, 5.0% of egg fertility and 3.5% of hatchability from fertile eggs.

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“…Later decreases in body weight were associated with large increases in intensity of lay. However, Nestor (1977c) found that large gains in 16-week body weight during the first 3 generations of selection were associated with only minor decreases in egg production. The results of both studies suggested that body weight was correlated negatively with intensity of lay with no association between body weight and broodiness.…”

Section: Table 2 Linear Regression Coefficients (B) and Their Standamentioning

confidence: 92%

Genetics of Growth and Reproduction in the Turkey

Nestor

1980

Poultry Science

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The purpose of this study was to determine the influence of a change in management on response to selection for increased egg production of turkeys in a population which had apparently plateaued. Response to selection plateaued or exhibited a decline from the 7th to 9th generations of selection. This plateau was attributed to 1) an increase in broodiness in the high egg line (E line) due to the use of an efficient broody hen management system during these generations, which allowed hens that went broody to be selected as breeders, and 2) an inequality of effect of the broody hen management system on the high producing E line hens and the relatively poor producing randombred control hens. Therefore, from the 10th through the 18th generations of selection, no broody hen treatment was used for E line hens, whereas the corresponding control hens were treated as before. A sample of control hens was also not treated for broodiness in the last 3 generations of selection.After the change in management, there was a large increase in egg production of the E line based on mean egg production of the E line and based on egg production of the E line relative to the randombred control. The increase in egg production of the E line after the change in environment was not associated with any further major reduction in body weight. Broodiness decreased and intensity of lay increased during this time. (

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Genetics of Growth and Reproduction in the Turkey

Cited by 85 publications

References 22 publications

Multivariate restricted maximum likelihood estimation of genetic parameters for production traits in three selected turkey strains*

Multivariate restricted maximum likelihood estimation of genetic parameters for production traits in three selected turkey strains*

Improving the reproductive traits of turkey hens with regard to toms selection

Genetics of Growth and Reproduction in the Turkey

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