Effects of milk fat depression induced by a dietary supplement containing Trans-10, Cis-12 conjugated linoleic acid on properties of semi-hard goat cheese
Chen, S. X., M. Rovai, A. L. Lock, D. E. Bauman, T. A. Gipson, F. Z. Ren, and S. S. ZengJournal of Dairy Science 92:2534-2538. 2009
Dietary supplements of conjugated linoleic acid (CLA) containing trans-10, cis-12 CLA reduce milk fat synthesis in lactating goats. This study investigated effects of milk fat depression induced by dietary CLA supplements on the properties of semi-hard goat cheese. Thirty Alpine does were randomly assigned to three groups and fed diets with lipid-encapsulated CLA that provided trans-10, cis-12 CLA at 0 (control), 3 (CLA-1) or 6 g/d (CLA-2). The experiment was a 3x3 Latin square design. Periods were 2 wk in length, each separated by 2-wk periods without CLA supplements. Bulk milk was collected on d 3 and 13 of each of three periods for cheese manufacture. The largest decrease (23.2%) in milk fat content induced by the high dosage (6 g/d per doe) of trans-10, cis-12 CLA supplementation at d 13 of treatment resulted in the decreases of cheese yield and moisture by 10.2 and 10.0%, respectively. Although CLA supplementation increased the hardness, springiness and chewiness and decreased the cohesiveness and adhesiveness of cheeses, no obvious defects were detected and no significant differences were found in sensory scores among cheeses. In conclusion, milk fat depression induced by a dietary CLA supplement containing trans-10, cis-12 CLA resulted in changes of fat-to-protein ratio in cheese milk and consequently affected properties of semi-hard goat cheese.
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