Effect of rumen-protected conjugated linoleic acid in combination with propylene glycol or rumen protected fat on performance and metabolic parameters of early lactation dairy cows

摘要

Conjugated linoleic acid (CLA) used as a fat supplement can reduce the content of milk fat and, therefore, has the potential beneficial effect of reducing energy requirements of the early lactating dairy cow (Griinari and Bauman, 2006). Propylene glycol (PG) as a glucose precursor may increase glucose supply, rumen-protected fat (RF) may help to increase energy supply. Therefore, feeding rumen-protected CLA (CLA) alone or in combination with PG or RF is of interest with regards to energy partitioning and the effect of an additional energy source of the diet on performance and metabolic responses of dairy cows.