Heterosis, recombination effects and genetic variability of egg composition in inbred lines of white leghorns and their crosses

Abplanalp, Hans; Peterson, Steven C.; Okamoto, Susumu; Napolitano, D.

doi:10.1080/00071668408454877

Cited by 9 publications

(4 citation statements)

References 7 publications

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“…Similar results were reported for populations known to overproduce abdominal fat (Cahaner et al, 1986). Positive heterosis for proportion of yolk and negative heterosis for proportion of albumen, on a wet weight basis, were reported for White Leghorns (Abplanalp et al, 1984). The data herein, on a dry weight basis, were consistent with regard to sign, but significant for yolk only.…”

supporting

confidence: 90%

“…Also, hens selected for increased abdominal fat laid smaller eggs with relatively larger yolks and greater lipid content (Cahaner et al, 1986). Abplanalp et al (1984) found positive heterosis for proportion of yolk and negative heterosis for proportion of albumen in eggs produced by crosses of inbred lines of White Leghorns. Therefore, egg weight may not be an appropriate predictor of yolk and albumen size because the ratio of albumen:yolk (A:Y) is subject to change based on genetic influences and age of hen.…”

mentioning

confidence: 96%

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Egg Production and Egg Composition of Parental Lines and F1 and F2 Crosses of White Rock Chickens Selected for 56-Day Body Weight

1989

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Egg production and weights of eggs and their components were measured in body weightselected lines and in reciprocal F, and F 2 crosses. Nonadditive genetic variation was significant for age at onset of lay; percentage of hen-day ovulations, hen-day egg production, and normal eggs produced; egg weight and shell thickness; percentage of dry yolk and total moisture; shell and yolk dry matter; and ratios of albumen to yolk (A:Y) both on a wet and dry weight basis. There was recombination loss for all of these traits except percentage of hen-day ovulations, dry yolk, and total moisture; and shell dry matter, thickness and wet A:Y ratios. Reciprocal effects were negligible except for percentage of dry albumen and A:Y ratios. Greater yolk dry matter in the high BW line was observed than in the low BW line; this was consistent with observations of lipid overproduction in fast growing populations of chickens. (

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supporting

confidence: 90%

mentioning

confidence: 96%

Egg Production and Egg Composition of Parental Lines and F1 and F2 Crosses of White Rock Chickens Selected for 56-Day Body Weight

1989

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“…Eggs with the heaviest yolks and the largest yolk: albumen ratios might be expected to contain the highest amount of cholesterol. Differences for percentage yolk and percentage albumen have been described for commercial layer strains (Rodda et al, 1977;Arafa et al, 1982;Abplanalp et al, 1984;Curtis et al, 1986;Harms and Hussein, 1993). The strains that differed in proportions of egg components also differed in egg size.…”

Section: Introductionmentioning

confidence: 98%

Comparative Yolk Cholesterol Content in Four Spanish Breeds of Hens, an F2 Cross, and a White Leghorn Population

Campo

1995

Poultry Science

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Yolk cholesterol content (milligrams per gram of yolk and milligrams per egg) was studied in eggs of four Spanish breeds of hens (Castellana, Buff Prat, Vasca, and Villafranquina), an F2 from a cross between Castellana and Buff Prat (C x BP-F2), and a White Leghorn population. Birds were tested at 30 wk of age. There were differences among breeds (P < .001), cholesterol concentration being significantly lower in the C x BP-F2 (13.14 +/- .26 mg/g yolk) than in the other breeds. Villafranquina and Buff Prat showed significantly lower cholesterol (14.54 +/- .26 and 14.56 +/- .26 mg/g yolk, respectively) than the White Leghorn (16.30 +/- .26 mg/g yolk). Eggs from the Vasca breed contained significantly more cholesterol (19.09 +/- .26 mg/g yolk) than did eggs laid by the other breeds, whereas no differences were found between Leghorn and Castellana. A negative heterosis percentage of -13% was found in the C x BP-F2 when compared with the parental breed means. The reduction in cholesterol concentration per egg observed in the C x BP-F2 (220.49 mg per egg) was not related to breed differences in egg weight or to the proportion of yolk per egg. Eggs from the Vasca breed, with the lightest yolk and smallest yolk: albumen ratio (P < .05), contained the highest amount of cholesterol (304.29 mg per egg). Eggs from the White Leghorn containing the second highest amount of cholesterol (275.63 mg per egg). Thus, the variation in cholesterol content per egg was not attributable to differences in the proportion of yolk.

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“…Abplanalp et al (1984) found evidence of negative heterosis in this trait in two-way crosses. They estimated the average heterosis to be 0.73%, while we found I.…”

Section: W G Appears Influences Food Efficiencymentioning

confidence: 93%

Food Efficiency in Pure Strains and Hybrids of Laying Hens Analysed in a Diallel Cross: I. Effect of Total Heterosis on Important Traits

Brenøe¹

1996

Acta Agriculturae Scandinavica, Section A - Animal Science

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Heterosis, recombination effects and genetic variability of egg composition in inbred lines of white leghorns and their crosses

Cited by 9 publications

References 7 publications

Egg Production and Egg Composition of Parental Lines and F1 and F2 Crosses of White Rock Chickens Selected for 56-Day Body Weight

Egg Production and Egg Composition of Parental Lines and F1 and F2 Crosses of White Rock Chickens Selected for 56-Day Body Weight

Comparative Yolk Cholesterol Content in Four Spanish Breeds of Hens, an F2 Cross, and a White Leghorn Population

Food Efficiency in Pure Strains and Hybrids of Laying Hens Analysed in a Diallel Cross: I. Effect of Total Heterosis on Important Traits

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