Muscle gain and feed-to-muscle-gain ratio measured by computed tomography in pig selection
Gain de muscle et indice de consommation rapporté au muscle mesurés par tomodensitométrie en sélection porcine
Résumé
Computed tomography is an interesting technology in genetics, because it makes it possible to precisely measure body composition and to access criteria such as muscle gain and the feed-to-muscle-gain ratio. The aim of the study was to compare muscle growth performance between six purebred populations, females from three sire lines and uncastrated males from three dam lines. The sire lines included a Duroc line and two Pietrain lines. The dam lines consisted of a Large White line and two Landrace lines. Feeding was ad libitum in a biphase sequence, and consumption was measured individually. Average Daily Gain (ADG) and feed to gain ratio (F:G) were computed between approximately 35 and 120 kg liveweight. After slaughter, half-carcasses were scanned by computed tomography to assess the lean meat content in carcass (LMC), average daily muscle gain (ADGm) and the feed-to-muscle-gain ratio (F:Gm). The sample was validated for 119 females from the sire lines and 112 entire males from the dam lines. The criteria tested had coefficients of variation significantly higher than those of the current criteria. The male lines obtained better LMC, ADGm and F:Gm than the female lines, while ADG and F:G were close. F:Gm was well correlated with F:G in the male lines, while the correlation was stronger with ADG in the female lines. LMC was strongly correlated with F:Gm and F:G in the male lines, whereas these correlations were less than 0.5 in the female lines. Almost all correlations between the criteria tested and the current criteria were less than 0.80. Breeder selection could be improved by introducing a precision-composition criterion and a feed-efficiency criterion related to muscle gain, especially in sire line.
Poster présenté aux 55es JRP.
La sélection des reproducteurs s’appuie sur des évaluations génétiques, basées sur la pondération de plusieurs critères. Les critères de croissance et d’efficience alimentaire sont fondés sur le suivi de gain de poids, sans tenir compte de sa composition tissulaire. La tomodensitométrie a permis de mesurer, d'une part le gain de muscle et, d'autre part, le nombre de kg d'aliment nécessaires pour produire un kg de muscle chez 6 lignées de race pure, dans le cadre du projet EFFISCAN (2019-2023).
La sélection des reproducteurs s’appuie sur des évaluations génétiques, basées sur la pondération de plusieurs critères. Les critères de croissance et d’efficience alimentaire sont fondés sur le suivi de gain de poids, sans tenir compte de sa composition tissulaire. La tomodensitométrie a permis de mesurer, d'une part le gain de muscle et, d'autre part, le nombre de kg d'aliment nécessaires pour produire un kg de muscle chez 6 lignées de race pure, dans le cadre du projet EFFISCAN (2019-2023).
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