Genetic Variation of Abdominal Fat, Body Weight, and Carcass Weight in a Female Broiler Line

Becker, Walter A.; Spencer, John V.; Mirosh, Larry W.; Verstrate, John A.

doi:10.3382/ps.0630607

Cited by 36 publications

(27 citation statements)

References 5 publications

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“…The estimate of .41 to .52 for the heritability of the relative amount of abdominal fat in this study agrees well with estimates of Becker et al (1984), Ricard (1975), Leclercq et al (1980), and .…”

Section: Discussionsupporting

confidence: 86%

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Fat Deposition in a Broiler Sire Strain I. Phenotypic and Genetic Variation in, and Correlations Between, Abdominal Fat, Body Weight, and Feed Conversion

1986

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Variability in body composition was examined weekly from 3 to 10 weeks of age in chickens from a broiler sire strain. Genetic aspects of body weight, quantity of abdominal fat, and feed conversion were examined in pedigree birds of the same strain at 6 weeks of age.Variability in abdominal fat relative to body weight (RAF), total percentage of carcass fat, and body weight (BW) was not influenced by sex or age. The phenotypic correlation (rp) between RAF and BW was generally positive, but low (between .20 and .68); that between RAF and total percentage of carcass fat was invariably positive and higher.The heritability estimated from sib analyses for body weight after ad libitum feeding was 0 (h 2 s ; res ) and 1 (h 2 d arns ), for RAF .41 (h 2^^) and 1 (h^ams). for feed conversion .39 (h 2 s i res ) and .53 (h 2 d ams ), and for body weight after restricted feeding .31 (h 2 s { res ) and .57 (h 2

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Section: Discussionsupporting

confidence: 86%

“…The large variation in the relative amount of abdominal fat, combined with a heritability Coefficients of variation of 20 to 30% for the amount of abdominal fat, both absolute and relative to body weight, were found in nearly all cases in which variability in amount of abdominal fat was examined (Becker et al, 1984, Leenstra, 1984.…”

Section: Discussionmentioning

confidence: 97%

Fat Deposition in a Broiler Sire Strain I. Phenotypic and Genetic Variation in, and Correlations Between, Abdominal Fat, Body Weight, and Feed Conversion

1986

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“…al, 1980). The genetic relationship between growth rate and fatness is large and positive in broiler chickens (Becker et al, 1984).…”

Section: Introductionmentioning

confidence: 99%

The Influence of Genetic Increases in Body Weight and Shank Width on the Abdominal Fat Pad and Carcass Composition of Turkeys

1986

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Body composition of large-bodied turkey lines was compared to that of a randombred control population (RBC2) at 8, 16, and 20 weeks of age. The large-bodied lines included a line (F) selected for 17 generations for increased 16-week body weight, a subline (FL) of F selected for four generations for increased shank width, and a subsample (FM) of F in which a new line was being developed for increased amount of leg muscle. The F line originated from the RBC2 line. Body weights of F and FM lines were similar and slightly larger than that of the FL line. Body weight of the F, FL, and FM lines was much greater than body weight of the RBC2 line.The abdominal fat pad, based on actual weight and weight as a percentage of live weight, was similar in the three large-bodied lines. The values (91 to 98 g) for the large-bodied lines were about 2.5 times the values for the RBC2 (35 g), when based on actual weight, while the abdominal fat pad was about twice as large in the heavy lines (.94 to .95) as the RBC2 line (.49) when based on a percentage of live weight. Females had larger abdominal fat pads than males.All of the heavy lines were similar in the percentages of ash, protein, fat, and dry matter of the carcass. Carcasses of the heavier lines were fatter, contained more dry matter, and less protein and ash than carcasses of the RBC2 line. The body composition of males and females did not differ at 8 weeks of age. However, at 16 and 20 weeks of age, female carcasses contained more fat and dry matter but had less protein and ash than male carcasses.Variation in body weight accounted for from 8 to 15% of the variation of different measures of abdominal fat. Correlation coefficients between live body weight and carcass composition were not statistically significant. Variation in the abdominal fat pad can explain from 36 to 48% of the variation in fat content of the carcasses.

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“…Abdominal and whole carcass fat were shown to have moderate to high heritability and to be positively correlated, both genetically and phenotypically, with body weight (Siegel, 1984). Becker et al (1984) concluded that abdominal fat could be reduced by selection but with a correlated reduction in body weight.…”

Section: Introductionmentioning

confidence: 97%

The Response to One Cycle of Divergent Selection for Abdominal Fat in Broilers Raised Under Different Conditions

1985

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One cycle of divergent sib selection, for or against abdominal fat weight, combined with within-family selection for body weight, was performed in a population of a commercial female grandparent line (White Rock type). Chicks from the first generation (S^,) of high-fat (HF) and low-fat (LF) selection lines were raised in three different environmental and climatic conditions. A second generation (S, G 2 ) of the selection lines was obtained by within-line selection for body weight only.The HF line had about 60% more abdominal fat than the LF line in all three environments. The realized heritability of this trait was calculated to be .73, almost identical to the heritability estimated from the base population. The LF line mean body weight was between 1% and 5% lower than that of the HF line. This difference was not significant and it was almost abolished in S, G 2 , after both lines were selected for body weight only. The difference between lines in abdominal fat weight was increased to 80% in S, G 2 . It can be concluded that reduction in abdominal fat weight was not associated with a decrease in body weight. Selection for body weight, in a line previously selected against abdominal fat, did not reverse the reduction in fat. The difference between the HF and LF lines had the same magnitude in both sexes and under different environmental conditions that increase or decrease fat deposition. (

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Genetic Variation of Abdominal Fat, Body Weight, and Carcass Weight in a Female Broiler Line

Cited by 36 publications

References 5 publications

Fat Deposition in a Broiler Sire Strain I. Phenotypic and Genetic Variation in, and Correlations Between, Abdominal Fat, Body Weight, and Feed Conversion

Fat Deposition in a Broiler Sire Strain I. Phenotypic and Genetic Variation in, and Correlations Between, Abdominal Fat, Body Weight, and Feed Conversion

The Influence of Genetic Increases in Body Weight and Shank Width on the Abdominal Fat Pad and Carcass Composition of Turkeys

The Response to One Cycle of Divergent Selection for Abdominal Fat in Broilers Raised Under Different Conditions

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