Journal ArticleDOI
The correlation between feed efficiency and rate of gain, a ratio and its denominator.
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In this paper, the correlation between a ratio and its denominator in terms of the correlationi between the nlumerator and the denominator an-d of the coefficients of variation of these two variables is predicted.Abstract:
Formulae are presented for the prediction of the correlation between a ratio and its denominlator in terms of the correlationi between the nlumerator and the denominator an-d of the coefficients of variation of these two variables. Graphs of the predicted values are shown for various ratios of the two coefficients of variation, as the primary correlation between numerator and denominator changes from -1.0 to +1.0. Experimental results from mice studies show reasonable agreement between the predicted and the actual correlation between gain in body weight and 'efficiency of feed use' when the latter is measured by the ratio, feed consumed/gain in body weight.read more
Citations
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Journal ArticleDOI
Sources of genetic variation in energetic efficiency of dairy cows
R.F. Veerkamp,G.C. Emmans +1 more
TL;DR: It can be concluded that stronger evidence needs to be collected before any true genetic variation in partial efficiencies can be assumed, and that the most important sources of genetic variations in ‘gross’ energetic efficiency are likely to be yield, the capacity for feed intake, the extent to which body tissue is mobilised and any differences in partitioning the energy eaten between these components.
Journal ArticleDOI
Improving feed efficiency in fish using selective breeding: A review
Hugues de Verdal,Hans Komen,Edwige Quillet,Béatrice Chatain,François Allal,John A. H. Benzie,John A. H. Benzie,Marc Vandeputte,Marc Vandeputte +8 more
TL;DR: Past work to improve feed efficiency in fish using selective breeding is reviewed, indirect selection criteria that could be used to improve FE (including growth after starvation/refeeding, body composition, neuropeptides or hormone levels) are discussed and promising approaches to measuring feed intake accurately are identified.
Journal ArticleDOI
Estimates of genetic parameters and selection strategies to improve the economic efficiency of postweaning growth in lambs.
G. D. Snowder,L. D. Van Vleck +1 more
TL;DR: Comparison of selection strategies showed the superiority of index selection (ADG, total feed, body weight) for economic improvement compared with other strategies, and selection strategies to improve economic efficiency of gain.
Journal ArticleDOI
Genetic variation in feed intake, growth and feed utilization in Atlantic salmon (Salmo salar)
TL;DR: A genetic variation for feed intake, growth and feed utilization in Atlantic salmon is indicated, with family explaining 31–32% of the variation.
Journal ArticleDOI
Genetic and Environmental Relationships Among Efficiency, Yield, Consumption and Weight of Holstein Cows
TL;DR: In this paper, the authors studied the genetic aspects of gross feed efficiency of milk production, defined as the ratio kilogram of fat-corrected milk yield per therm of estimated net energy consumed.
References
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Journal ArticleDOI
Efficiency of Feed Use in Beef Cattle
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Mathematical contributions to the theory of evolution.—On a form of spurious correlation which may arise when indices are used in the measurement of organs
TL;DR: In this paper, a statistical biologist attribntes the correlation between two functions like u and v to organic relationship and the particular case that is likely to occur is when u and V are indices with the same denominator for the correlation of indices seems at first sight a very plausible measure of organic correlation.
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Fallacy of Per-Weight and Per-Surface Area Standards, and Their Relation to Spurious Correlation
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Ratios as criteria for selection in animal or plant breeding, with particular reference to efficiency of food conversion in sheep
TL;DR: This paper develops formulae for writing the heritability of any ratio, as well as its genetic correlations with its numerator and its denominator, in terms of the relationships between the numerical parameters of W and B, and indicates that selection for high wool weight will also increase efficiency, as measured by either ratio.