Abstract
Double muscled Charolais bulls are compared to normal Charolais and Friesian bulls on the basis of feed intake, liveweight gain, body composition, efficiency of muscle growth and protein retention and reaction to feeding levels. Double muscled bulls have a lower feed intake and a lower growth rate than normal animals. Muscle and protein deposition potential are similar in both genotypes, while lipid deposition is far lower in double muscled animals.
Differences between double muscled and normal Charolais bulls in body gain composition, in feed efficiency and in reaction to feeding levels are similar (but in the opposite way) to the differences between Friesian and Charolais bulls. Differences between normal and double muscled animals are discussed in relation to maintenance requirements and energy utilisation for growth. It is concluded, that in many respects, double muscled animals appear to be extreme types of late maturing, but not deviant animals.
Résumé
Des taurillons charolais culards ont été comparés à des taurillons normaux de race Charolaise et de race Frisonne, pour la consommation d’aliments, le gain de poids vif3 la composition corporelle, l’efficacité de la croissance musculaire et la protéïnogénèse, et leur réaction à différents niveaux alimentaires. Les taurillons culards ont une moindre capacité d’ingestion et une Vitesse de croissance plus faible que celles des taurillons normaux. Les potentiels de déposition de muscles et de protéines sont similaires pour les deux types génétiques, alors que la déposition des lipides est beaucoup plus faible chez les animaux culards.
Les différences entre taurillons charolais culards et normaux pour la composition du gain de poids, l’efficacité alimentaire et la réaction aux différents niveaux alimentaires, sont similaires (mais de sens opposé) a celles entre taurillons normaux charolais et frisons. Les différences entre animaux culards et normaux sont discutées en liaison avec les besoins d’entretien et l’utilisation de l’énergie pour la croissance. II est conclu qu’à de multiples égards, les animaux culards apparaissent comme un type extrême de maturité tardive plutôt que comme un cas déviant des tendances normales.
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Geay, Y., Robelin, J., Vermorel, M., Béranger, C. (1982). Muscular Development and Energy Utilisation in Cattle: The Double Muscled as an Extreme or a Deviant Animal. In: King, J.W.B., Ménissier, F. (eds) Muscle Hypertrophy of Genetic Origin and its use to Improve Beef Production. Current Topics in Veterinary Medicine and Animal Science, vol 16. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-7550-7_5
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DOI: https://doi.org/10.1007/978-94-009-7550-7_5
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