Perspectives for Poultry Genetics in the Age of Molecular Biology

Sheldon, B. L.

doi:10.1079/wps19800007

Cited by 11 publications

(7 citation statements)

References 173 publications

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“…Although studies of a similar nature involving biochemical parameters in relation to disease resistance, egg production and meat production have been noted (Grunder 1979;Sheldon 1980) …”

mentioning

confidence: 99%

Blood Plasma and Production Traits in Commercial Broiler Parent Stocks

Grunder¹,

Chambers²,

Gavora³

et al. 1983

Can. J. Anim. Sci.

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“…Although studies of a similar nature involving biochemical parameters in relation to disease resistance, egg production and meat production have been noted (Grunder 1979;Sheldon 1980) …”

mentioning

confidence: 99%

Blood Plasma and Production Traits in Commercial Broiler Parent Stocks

Grunder¹,

Chambers²,

Gavora³

et al. 1983

Can. J. Anim. Sci.

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“…Accordingly, after transformation to a normally distributed trait, it would be worthwhile to estimate its heritability. According to Sheldon (1980), selection possibilities for low variability may exist.…”

Section: Systematic Variation: Repeatabilitiesmentioning

confidence: 99%

“…where i = 1,..., N; N = number of hens in the analysis; j = 1,..., n; n = number of periods per hen; RFCy = residual feed consumption of hen i in period j (grams per day); \i = overall mean; aj = random effect of hen i; ey = random effect of period j within hen i; 2) phenotypic correlations between RFC in different recording periods with increasing intervals (from 4 to 40 wk); 3) phenotypic correlations between RFC in each single period and the averaged RFC-T; 4) the standard deviation of RFC among periods within each hen (sdRFC); following Sheldon (1980), this variation in individual RFC between periods is a measure for individual stability.…”

Section: Systematic Variation: Repeatabilitiesmentioning

confidence: 99%

Residual Feed Consumption in Laying Hens.

Luiting¹,

Urff²

1991

Poultry Science

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A large fraction (on average, 25%) of the variance of daily feed consumption among individual laying hens appears unaccounted for by a model with metabolic body weight, daily egg mass production, and body weight gain as independent variables. This unexplained term is referred to as "residual feed consumption" (RFC), defined operationally as the difference between the observed feed consumption of a hen and its consumption as predicted from the model. The study described here deals with the quantification of the phenotypic variation of RFC of hens of a White Leghorn population during a 44-wk laying period (20 to 64 wk of age) in 11 time segments of 4 wk each, fed either a commercial or a low-energy diet (11.7 and 10.0 MJ ME/kg, respectively, where 1 MJ = .239 Mcal). The RFC showed a standard deviation of 4 to 8 g/day. The repeatability of RFC was estimated as .52 to .58. For each time segment between 32 and 56 wk of age, phenotypic correlations between RFC and RFC accumulated over the whole laying period were estimated to be around .8. It was concluded that RFC shows a considerable amount of systematic and permanent variation, and that experimental RFC measurements can be limited to the period between 32 and 56 wk. It was also shown that variation in RFC was caused mainly by differences among hens in maintenance requirements per unit (kilogram.75) of metabolic body weight.(ABSTRACT TRUNCATED AT 250 WORDS)

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“…Perspectives Sheldon (1980) expressed the view that new knowledge in molecular biology is not sufficient to allow productive application of the new genetic engineering technology during the 1980s. Purchase (1986) expressed a positive view for applications of biotechnology in poultry.…”

Section: Feather Pigmentsmentioning

confidence: 99%

Genetics of turkeys: Origin and development

Buss

1989

World's Poultry Science Journal

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Perspectives for Poultry Genetics in the Age of Molecular Biology

Cited by 11 publications

References 173 publications

Blood Plasma and Production Traits in Commercial Broiler Parent Stocks

Blood Plasma and Production Traits in Commercial Broiler Parent Stocks

Residual Feed Consumption in Laying Hens.

Genetics of turkeys: Origin and development

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