Estimation of crossbreed beef carcass chemical composition by DXA scan of half-carcass or 11th rib

Autor: Caroline Xavier, Morel, I., Siegenthaler, R., Dohme-Meier, F., Yannick Le Cozler, Sylvain Lerch
Přispěvatelé: Physiologie, Environnement et Génétique pour l'Animal et les Systèmes d'Elevage [Rennes] (PEGASE), AGROCAMPUS OUEST, Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE), Agroscope, EAAP
Jazyk: angličtina
Rok vydání: 2021
Předmět:
Zdroj: Book of abstracts
72. Annual meeting of the european federation of animal science (EAAP)
72. Annual meeting of the european federation of animal science (EAAP), EAAP, Aug 2021, Davos, Switzerland. pp.238
HAL
Popis: International audience; The aim was to estimate beef half carcass (HC) composition by using dual X-ray absorptiometry (DXA), from either HC or 11th rib analysis. 42 cold left HC (94±49 kg, 17 to 157 kg) and their 11th rib were obtained from bulls of the three most Swiss-widespread crossbreeds in dairy herds (♀ Brown Swiss × ♂ Angus, Limousin or Simmental). Lean, fat, bone mineral content (BMC) and total masses of cold HC and 11th rib were determined with a DXA scanner (iLunar, GE, ‘Right Arm’ mode). HC was then grinded, before chemical analyses (lipid: Soxhlet, protein: Dumas, ash: 550 °C). Regressions (R software, v3.6.3) were tested between the HC and 11th rib DXA values and HC chemical composition. HC contained 11±8.3 (0.8 to 29.1) kg lipid, 18±9.2 (3.1 to 30.6) kg protein and 4±1.8 (0.8 to 6.5) kg ash. The cold HC weight explained a large part of chemical component masses (lipid: R2=0.884, residual coefficient of variation (rCV)=25.3%; protein R2=0.996, rCV=3.4%; ash R2=0.971, rCV=7.8%). It was also well estimated from HC DXA total mass with a R2 of 0.999 (rCV=1.3%). Estimations of lipid, protein and ash masses with a single HC DXA variable were precise with fat (R2=0.983, rCV=9.7%), lean (R2=0.996, rCV=3.4%) and BMC (R2=0.975, rCV=7.8%), respectively. Multiple models were even more accurate with HC DXA fat, lean and BMC masses for lipid mass (R2=0.990, rCV=7.7%), cold HC weight and DXA fat mass for protein mass (R2=0.997 and rCV=2.9%), and cold HC weight, DXA fat and BMC masses for ash mass (R2=0.979 and rCV=7.2%). Multiple regressions of HC lipid and protein masses with 11th rib DXA variables provided R2 very close to the previous ones established from HC DXA scan. But the rCV was twice higher for lipid mass (rCV=14.8%) and remained equal for protein mass (rCV=2.9%). Crossbreed effect was rarely significant in models and only improved slightly their accuracy (maximum of +1% for the R2 and -1.5% for rCV for HC lipid mass from 11th rib DXA variables). A single rib DXA scan appears to be a promising method to estimate carcass composition in a simple, quick, reproducible, accurate and non-destructive way.
Databáze: OpenAIRE
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