The Relationship Between Feed Conversion and Ether Extract of Broilers

Thomas, Charles H.; Glazener, E. W.; Blow, W. L.

doi:10.3382/ps.0371177

Cited by 17 publications

(3 citation statements)

References 3 publications

(5 reference statements)

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“…Because of faster growth, the larger birds were more efficient during the period preceding the measurement of fat content. Thomas et al (1958), in support of Brody's (1935) prediction, found a lower proportion of fat at 10 weeks of age in a more efficient group of chickens than in a less efficient group from the same strain. Birds of the more efficient group were, however, lighter than those of the less efficient group, which accounts partly, at least, for the apparent disagreement with the results of Pym (1971) and Wethli and Wessels (1973).…”

Section: Phenotypic Correlations Between Performance and Body Composisupporting

confidence: 74%

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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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Section: Phenotypic Correlations Between Performance and Body Composisupporting

confidence: 74%

“…Both Pym (1971) and Wethli and Wessels (1973) have reported negative phenotypic correlations between FCR and carcass fat in chickens. In contrast Thomas et al (1958) found that a group of chickens with poor food conversion efficiency were fatter than a corresponding group from the same strain with superior conversion efficiency.…”

Section: Introductionmentioning

confidence: 77%

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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“…Pym and Farrell (1976) have shown that selection for a better food conversion ratio produces less fattening in the selected birds. Others also found that linkages exist between fattening and food conversion ratio (Thomas et al, 1958;Littlefield, 1972;Wethli and Wessels, 1973;Washburn e¿a/., 1975;Griffiths etal, 1978). Our results prove that inverse selection (for the degree of fattening) modifies the food conversion ratio.…”

Section: Discussionmentioning

confidence: 93%