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Estimation of genetic parameters for growth, carcass and overfeeding traits in a white geese strain

In an experimental strain of white plumage geese created in 1989, two experiments were carried out from 1993 to 1995 in order to estimate genetic parameters for growth, and carcass composition traits in non-overfed animals, and genetic parameters for growth and fatty liver formation in overfed anima...

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Bibliographic Details
Published in:Genetics selection evolution (Paris) 2000, Vol.32 (4), p.415-427
Main Authors: Larzul, Catherine, Rouvier, Roger, Rousselot-Pailley, Daniel, Guy, Gérard
Format: Article
Language:English
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Summary:In an experimental strain of white plumage geese created in 1989, two experiments were carried out from 1993 to 1995 in order to estimate genetic parameters for growth, and carcass composition traits in non-overfed animals, and genetic parameters for growth and fatty liver formation in overfed animals. Four hundred and thirty-one non-overfed animals were bred and slaughtered at 11 weeks of age; they were measured for forearm length, keel bone length, chest circumference and breast depth before and after slaughtering. The carcasses were partly dissected in order weigh breast, breast muscle and skin + fat, and abdominal fat. Four hundred and seventy-seven overfed animals were slaughtered at 20 weeks of age; they were measured for "paletot" (breast meat, bone and meat from wings, bone and meat from thigh and legs) weight and liver weight. In these two experiments, the weights had moderate to high heritability values. Breast depth measured on live animals showed a low heritability value. In overfed animals, liver weight showed a high heritability value. Liver weight could be increased by selection without a great effect on "paletot" weight. Thus, obtaining a white plumage geese strain for fatty liver production by selection would be difficult because only 20% of overfed animals had fatty liver. The results did not allow to conclude on the influence of selection on liver weight on carcass traits such as muscle or fatty tissue weight. Paramètres génétiques dans une lignée d'oie blanche : caractères de croissance et de composition de la carcasse chez des animaux non gavés, et de la croissance et de l'aptitude au gavage chez des animaux gavés. Dans une lignée d'oies blanches, créée en 1989, deux expériences ont été réalisées en vue d'estimer les paramètres génétiques des performances de croissance et des caractères de composition de la carcasse sur des animaux non gavés, et des performances de croissance et de gavage chez des animaux gavés. Les animaux non gavés (431) ont été élevés jusqu'à l'âge de 11 semaines, âge auquel ils ont été abattus. Sur ces animaux ont été mesurés la longueur de l'avant-bras, la longueur du bréchet, le tour de poitrine et la profondeur de poitrine, mesures effectuées avant et après abattage. La carcasse a été partiellement disséquée afin de peser le filet, le muscle du filet, la peau et le gras du filet ainsi que le gras abdominal. Les animaux gavés ont été abattus à l'âge de 20 semaines. La carcasse, le gras abdominal, le paletot et le
ISSN:0999-193X
1297-9686
DOI:10.1051/gse:2000128