Effetto dei coniugati dell'acido linoleico (CLA) sulle performance produttive e sul quadro endocrino e metabolico di bovine nella fase di transizione

The aims of this study were to evaluate the effects of conjugated linoleic acids (CLA) on productive performance and at endocrine-metabolic level in the transition dairy cow. Seven weeks before the expected calving, two homogeneous and comparable groups of animals were formed (5 animals in each group) to allow the daily administration, in the treated group, of synthetic rumen protected CLA from 4 wk before predicted calving until 4 wk postpartum. Blood samples were collected weekly from -4 until +14 weeks after calving in order to evaluate the metabolic and endocrine profile and daily have been recorded individual milk yeld, body condition score, and body weight. CLA supplementation had no detectable effects on plasma insulin, GH, IGF-1, NEFA and glucose concentrations, however these preliminary results seem to indicate a significant decrease (P<0,01) of plasma leptin in the treated group after parturition.