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Effect of Physical Form of the Diet and Stress on Carcass Characteristics of Lamb¹

University of Wyoming, Laramie 82071

Abstract

Each of 58 blackface and 59 whiteface whether lambs was allotted to one of four nutritional treatments: chopped alfalfa hay, alfalfa hay cubes, pelleted alfalfa hay or a pelleted diet of hay, oats and barley. Lambs fed the chopped hay and hay cubes had lighter carcass weights, less intramuscular fat in the longissimus muscle, smaller loineyes, darker colored lean and lower quality grades than lambs fed the two pelleted diets. Fasting the lambs for 72 hr resulted in less fat, darker lean, decreased blood plasma fatty acid concentrations of C18:2 and C18:3, increased concentrations of C18:l and C18:0 and increased blood ketone concentrations. Interactions (P<.05) between diet and fasting occurred. During fasting, fat decreased more on fatter lambs that had been fed pelleted hay and pelleted hay and grain than in leaner lambs fed chopped hay and cubed hay diets. Marbling decreased most during fasting in meat from lambs fed the chopped hay diet. Darkness increased during fasting in meat from lambs on all diets except the hay and grain pellet.

¹ Published with the approval of Director, Wyoming Agr. Exp. Sta. as Journal Article No. JA1090.