This review deals with: i) the effects of dietary lipid supplementation on milk fatty acid composition in small ruminants, taking into consideration also the different responses observed among ruminant species, and ii) the implications of milk fat modification on human health. In the last years, an increasing number of studies have focused on lipid supplementation in dairy goats and ewes. Some studies have focused on vegetable lipid sources (i.e. linseed, sunflower, rapeseed, soybean, olive), either as whole seed (raw and processed) or as oil (protected and unprotected), whereas few of them have dealt with the effects of marine oil in combination with vegetable fat on milk composition in small ruminants. Responses to lipid supplementation can vary significantly among ruminant species, as a consequence of differences in eating behaviour, rumination, buffering of rumen pH, rumen digestion kinetics and rumen passage rate. Recently, the metabolic mechanisms regulating milk fat synthesis have been studied across ruminant species, by using the milk fat depression model. At present, effective nutritional strategies based on dietary lipid supplementation of small ruminants are available, to obtain dairy products enriched in conjugated linoleic acid (CLA), vaccenic acid (VA) and alpha-linolenic acid (LNA) Specific clinical studies are needed to provide the scientific evidences that enriched dairy products may be beneficial to human health.
Lipid supplementation in small ruminant nutrition and dairy products quality: implications for human nutrition
MELE, MARCELLO;
2010-01-01
Abstract
This review deals with: i) the effects of dietary lipid supplementation on milk fatty acid composition in small ruminants, taking into consideration also the different responses observed among ruminant species, and ii) the implications of milk fat modification on human health. In the last years, an increasing number of studies have focused on lipid supplementation in dairy goats and ewes. Some studies have focused on vegetable lipid sources (i.e. linseed, sunflower, rapeseed, soybean, olive), either as whole seed (raw and processed) or as oil (protected and unprotected), whereas few of them have dealt with the effects of marine oil in combination with vegetable fat on milk composition in small ruminants. Responses to lipid supplementation can vary significantly among ruminant species, as a consequence of differences in eating behaviour, rumination, buffering of rumen pH, rumen digestion kinetics and rumen passage rate. Recently, the metabolic mechanisms regulating milk fat synthesis have been studied across ruminant species, by using the milk fat depression model. At present, effective nutritional strategies based on dietary lipid supplementation of small ruminants are available, to obtain dairy products enriched in conjugated linoleic acid (CLA), vaccenic acid (VA) and alpha-linolenic acid (LNA) Specific clinical studies are needed to provide the scientific evidences that enriched dairy products may be beneficial to human health.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
