Estimates by Sex of Genetic Parameters for Body Weight and Skeletal Dimensions in a Random Bred Strain of Meat Type Fowl

Merritt, E. S.

doi:10.3382/ps.0450118

Cited by 34 publications

(31 citation statements)

References 14 publications

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“…' Heritability estimates for males based on dam components of variance were higher than those of females, which may correspond to the fact that variance due to sex-linked genes coming from the dam is not present in females but is present for males, which increases the numerator of heritability for males but not females from the dam component of variance. Merritt (1966) and Becker (1975) Kaatz (1967) found a similar result.…”

Section: Discussionsupporting

confidence: 69%

“…Martin et al (1953) showed that the high genetic correlations between weights at 6, 9, and 12 wk of age were more persistent during the growth period than other correlations (phenotypic and environmental), and the genetic effect did not vary from one age to another, although environmental effects were greatly different from one age to another. Merritt (1966) and Pym and Nicholls (1979) mentioned a high genetic correlation between 5 wk and 9 wk body weight from the sire-dam components of variance for males and females. Aman and Becker (1983) found a similar result for 6 wk and 7 wk body weight from the sire component of variance.…”

mentioning

confidence: 99%

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Genetic study of Dandarawy chickens: I. Heritabilities and genetic correlations of body weight and weight gain

Abdellatif¹

1989

Genet. Sel. Evol.

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Summary — Heritability values of body weight and weight gain at the ages of 1 d, and 4, 8, 12, and 16 wk were estimated from 57 half-sib families of a strain of the Egyptian breed Dandarawy representing 57 sires, 256 dams, and 1,605 offspring. Estimates were obtained for both of the sexes separately as well as for the two combined. The estimates of heritability ranged from 0.24 to 0.60 for males and females from sire components of variance, and 0.03 to 0.37 for males and females from dam components of variance. There were marked differences between heritability estimates from sire and dam components of variance and between males and females. The heritability estimates from sire components were generally higher than those from dam components, which indicated the importance of the additive genetic effect and possible sex-linked effects. It was also noticed that the environment had an effect on both body weight and weight gain which is reflected in heritability estimates from one age to another.The results showed that there were highly significant correlations between body weights from 4 to 16 wk of age. There were no correlations between hatch weight and weights at the other ages. This indicates that it is possible to consider the hatch weight as a trait completely separate from the other traits in males, females, and the sexes combined. The highly significant genetic and environmental correlations showed that both genetic and environmental factors had the same influences on body weight from 4 to 16 wk of age. There were absent estimates of the genetic correlations especially with the dam components of variance in males and females. The correlations between weight gains at different periods showed highly significant estimates up to 12 wk of age. These correlations reflect the importance of both genetic and environmental effects on weight gain at the different periods. Our results indicate that it is possible to select for body weight and weight gain at an early rather than a late (16 wk

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Section: Discussionsupporting

confidence: 69%

mentioning

confidence: 99%

Genetic study of Dandarawy chickens: I. Heritabilities and genetic correlations of body weight and weight gain

Abdellatif¹

1989

Genet. Sel. Evol.

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“…For example, Besbes et al (1992Besbes et al ( , 1993 (Ducrocq, 1994) (Burke and Sharp, 1989) and feed and water consumption (Marks, 1985). Moreover, some papers have reported differences in the genetic parameter estimates between sexes in chickens (Merritt, 1966;Morton, 1973) as well as in turkeys (Toelle et al, 1990). Therefore, in The birds were also selected for leanness.…”

mentioning

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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“…(1947), El-Ibiary and Shaffner (1951), Abplanalp £t al. (1960), Merritt andGowe (1962), Merritt (1966), Casey (1970) and Silva (1974) were in the same range as those cited by Kinney (1969) for body weight. The genetic correlations between shank length and body weight were generally found to be of an intermediate to high order.…”

Section: Heritabilities and Genetic Correlationssupporting

confidence: 65%

Relationships between body composition and reproductive performance in the laying hen

Greenberg

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Estimates by Sex of Genetic Parameters for Body Weight and Skeletal Dimensions in a Random Bred Strain of Meat Type Fowl

Cited by 34 publications

References 14 publications

Genetic study of Dandarawy chickens: I. Heritabilities and genetic correlations of body weight and weight gain

Genetic study of Dandarawy chickens: I. Heritabilities and genetic correlations of body weight and weight gain

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

Relationships between body composition and reproductive performance in the laying hen

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