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Forty-five Talaverana breed sucking lambs of both sexes were slaughtered at 10 and 12 kg live weight in order to study the effect of gender and slaughter weight on carcass, meat and fat traits. Carcass dressing proportions and fatness (by various measures) were higher in females and heavier lambs, which also showed better conformation. Lightness (L*) of the carcass fat was higher in males and heavier lambs. Females and heavier lambs also displayed a greater proportion of fat on dissection, primarily due to a higher percentage of subcutaneous fat tissue. Water-holding capacity was greater in males and in lower-weight lambs. Males presented higher total collagen and lower soluble collagen values than females. In general, a high percentage of short-chain (C12:0 and C14:0) fatty acids, as well as of palmitic acid (C16:0), was observed in the intramuscular fat of the longissimus dorsi muscle, corresponding with an exclusively milk diet.

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Three weaning treatments (weaning at 45 days of age, at 65 days of age, unweaned) and two slaughter weights (24 and 28 kg) were compared in lambs raised at pasture, and their effect on carcass and meat traits were studied. Unweaned lambs displayed a greater growth rate, lower concentrate consumption, greater dorsal fat thickness, more kidney knob and channel fat and greater total fat levels, measured through dissection of the hind limb. Total collagen concentration was lower in unweaned lambs and the intramuscular fat of these same animals exhibited a greater proportion of saturated fatty acids and a lower n-6/n-3 fatty acid ratio. Slaughter weight influenced scored carcass fatness, which was greater in heavier lambs, meat colour, which displayed greater lightness in lower-weight lambs, and water-holding capacity, which was lower in lambs with the lower slaughter weight. The heavier lambs displayed lower soluble collagen values, and the intramuscular fat of the longissimus dorsi muscle of these same lambs contained higher levels of monounsaturated and lower levels of polyunsaturated fatty acids.

-This study involved 53 Talaverana-breed lambs fattened until reaching a slaughter weight of 28 kg. After weaning at 45 days of age, the lambs were divided into four study groups. The lambs of two of the groups were fattened at pasture, while those of the other two groups were kept on a drylot. One group at pasture and another on the drylot received a commercial fattening concentrate. The other two groups received whole barley with a protein supplement. Drylot lambs displayed better carcass dressing, greater carcass fatness, higher carcass conformation values and a superior refrigerated carcass weight than lambs fattened at pasture. Lambs fattened with concentrate displayed better carcass dressing, higher carcass compactness and less digestive tract development (due to a lower proportion of stomach and digestive content) than those fed barley. The fat colour of lambs fattened at pasture was lighter (greater L*) than that of the drylot lambs, and the lambs fed concentrate exhibited a higher redness index (a*) than those fed barley. The longissimus dorsi (LD) muscle was used to evaluate meat quality. The lambs fattened at pasture displayed a lower lightness value, lower cooking losses and greater pleasantness scores in the sensorial analysis than drylot lambs. The lambs fattened at pasture presented lower values of fatty acids with an odd number of carbon atoms and monounsaturated fatty acids and higher linolenic acid (C18:3) levels than drylot lambs in both the intramuscular fat of the LD muscle and in subcutaneous fat. The lambs fed barley exhibited a higher proportion of fatty acids with an odd number of carbon atoms and lower C18:3 values than the lambs given the concentrate. Résumé -Utilisation de l'orge entière pour l'engraissement d'agneaux avec des systèmes d'élevage différents. Effets sur la qualité de la carcasse et de la viande. Cinquante trois agneaux de la race Talaverana ont été engraissés jusqu'à un poids d'abattage de 28 kg. Après le sevrage à 45 jours d'âge, les agneaux ont été divisés en quatre lots expérimentaux, deux ont été engraissés au pâturage et deux autres en bergerie. Un des deux lots de chaque système d'engraissement a été nourri avec un aliment concentré commercial, tandis que l'autre a reçu de l'orge entière avec un supplément protéique. Les agneaux élevés en bergerie ont présenté un rendement de carcasse supérieur, des carcasses plus lourdes (poids de carcasse froide), un état d'engraissement plus important et une meilleure conformation que les agneaux élevés au pâturage. Les animaux qui ont reçu l'aliment commercial ont eu un rendement et une compacité de la carcasse plus élevés que ceux nourris avec l'orge. En revanche, le poids du tractus digestif plein a été moins important, en raison d'une moindre proportion d'estomacs et de contenu digestif. La luminosité (L*) du gras chez les agneaux au pâtu-rage a été plus élevée que celle des agneaux élevés en bergerie ; l'indice de rouge (a*) a été supérieur chez les animaux nourris avec l'aliment commercial. L'évaluation de la qua...