Efficiency of Selection for Broiler Growth at Various Ages

Martin, G. A.; Glazener, E. W.; Blow, W. L.

doi:10.3382/ps.0320716

Cited by 20 publications

(8 citation statements)

References 7 publications

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“…This phenotypic response of the unselected characteristic was due to the magnitude of the heritabilities of the selected and unselected traits and the highly positive genetic and environmental correlations between them. Realized genetic correlations (Table 6) were in good agreement with the correlations obtained between three and nine-week weight by Martin et al (1953). The phenotypic correlations were also consistent with those reported by Callenbach (1934) between three and eight-week weight.…”

Section: Resultssupporting

confidence: 86%

Selection for Body Weight at Eight Weeks of Age

Siegel

1963

Poultry Science

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Section: Resultssupporting

confidence: 86%

Selection for Body Weight at Eight Weeks of Age

Siegel

1963

Poultry Science

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“…Estimates of phenotypic correlation of body weight and carcass quality at different ages were given by Martin et al (1953), Merritt (1966) and Ricard (1980) (Becker, 1975 (Falconer, 1981 (Table it of the 2 fullsibs for all the traits studied showed significant correlations for the majority of the traits, except those concerning the dressing and giblet percentages.…”

mentioning

confidence: 99%

Genetic study on Dandarawy chickens. II. Heritability of live and carcass measurements

Abdellatif¹

1989

Genet Sel Evol

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“…Martin et aL (1953) indicated the same effect of genetic factors on body weight. Genetic effects depend mainly on the fact that the genes that affected body weight at the different ages were the same and had pleiotropic effects.…”

Section: Discussionmentioning

confidence: 99%

“…Kinney (1969) summarized those correlations, which were relatively high and positive. 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.…”

mentioning

confidence: 97%

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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Efficiency of Selection for Broiler Growth at Various Ages

Cited by 20 publications

References 7 publications

Selection for Body Weight at Eight Weeks of Age

Selection for Body Weight at Eight Weeks of Age

Genetic study on Dandarawy chickens. II. Heritability of live and carcass measurements

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

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