Selection for Body Weight at Eight Weeks of Age

Siegel, P. B.

doi:10.3382/ps.0410954

Cited by 175 publications

(74 citation statements)

References 27 publications

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“…In other instances there is good agreement both within and between investigations, e.g. between El-Ibiary and Shaffner (1951), Hurry andNordskog (1953), Wyatt (1954), Peeler, Glazener and Blow Goodman and Godfrey (1956), Hale (1961) and Siegel (1962) (all using hierarchical matings) that D >S for body weight at various juvenile ages. But even here, the conclusion that may be drawn-that sex-linkage is probably unimportant compared to other effects-is strictly limited.…”

Section: Introductionmentioning

confidence: 74%

Maternal and sex-linked effects on size and conformation in domestic fowl

Cock

Morton

1963

Heredity

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Section: Introductionmentioning

confidence: 74%

Maternal and sex-linked effects on size and conformation in domestic fowl

Cock

Morton

1963

Heredity

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“…However, despite numerous selection experiments for growth rate in chickens (e.g. Siegel, 1962;Jaap, 1963;Maloney et al, 1963), reports on correlated responses in body composition are relatively few. Proudman et al (1970) found that selection for increased body weight in chickens resulted in an increase in carcass fat; the proportion of carcass fat in a low body-weight line was only two-thirds that in a high line when measured at the same age after 15 generations.…”

Section: Introductionmentioning

confidence: 97%

Selection for food conversion in broilers: Body composition of birds selected for increased body‐weight gain, food consumption and food conversion ratio

Pym

Solvyns

1979

British Poultry Science

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1. Body composition was determined in 9-week-old chickens sampled from four lines selected either for increased body-weight gain (line W), for increased food consumption (line F), for decreased food conversion ratio (line E), or at random (line C), after three, four and five generations of selection.2. After five generations of selection the proportions of carcass water (678 g/kg) and protein (187 g/kg) were highest in line E and lowest (636, 180 g/kg respectively) in line F. The proportion of fat was lowest (83 g/kg) in line E and highest (134 g/kg) in line F.3. Lines W and C were similar and intermediate to lines E and F for all the carcass constituents.4. There was more fat in females (115 vs 98 g/kg) and less protein (177 vs 190 g/kg) and water (652 vs 665 g/kg) than in males.5. Line differences in carcass composition were not appreciably altered if birds were killed at equal weight rather than equal age.

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“…HWN and LWN were lines of nondwarf White Plymouth Rocks which had undergone individual phenotypic selection for high (HW) and for low (LW) body weight at 56 days of age (S IEGEL , 1962 ;. In the S 13 generation the sex-linked dwarfing allele (dw) was introduced into these lines by mating Dw + / dw males of a meat-type stock to a random sample of females from each line (R EDDY et l ll., 1975 (table 1), with no effect of alleles at the dwarf locus on residual titers.…”

Section: Methodsmentioning

confidence: 99%