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Effects of feeding factors on dairy performance and milk fatty acid composition in cows and goats

AutorFerlay, A.; Bernard, Laurence; Toral, Pablo G. ; Martín, C. ; Chilliard, Yves
Fecha de publicación10-nov-2014
EditorAsian-Australasian Association of animal Production Societies
Citación16th AAAP Animal Science Congress (2014)
ResumenThis paper, after summarizing the digestive and metabolic origins of milk fatty acids (FA), presents the main nutritional factors regulating their concentration in cows and goats. Compared to diets based on conserved grass plus concentrate, grazed grass, decreased the milk concentration of saturated FA, in favor of trans isomers of 18:1 and 18:2, cis9trans11 of conjugated linoleic acid (CLA) and 18:3n-3. Oilseed supplementation increased the milk transFA concentration. Linseed, when compared to rapeseed, increased milk 18:3n-3 concentration. The milk FA responses to oilseed supplementation were time dependent. In cows,milk FA concentration responses to supplementation were transient, whereas they were more persistent in goats. Feeding low-fibre/high-starch diets and/or lipid supplements rich in polyunsaturated FA induced milk fat depression (MFD) incows, whereas these diets increased milkfat secretion ingoats. The milk fat synthesis during diet-induced MFD was associated with increase in the milk concentration of specific transFA, including trans10cis12-CLA. Differences in milk fat yield responses to oilseed supplementation between cows and goats seem to be related toboth differences in ruminal lipid metabolism and formationof specific biohydrogenation intermediates and the relativesensitivity of mammary lipogenicgene expression between these two species.Indeed, goats are less sensitive to shift between trans11-18:1 to trans10-18:1 in the rumen, explaining the higher milk concentration of trans11-18:1 and cis9trans11-CLA.The addition of tannins or essential oils in diet had little effect on milk FA composition.Milk FA concentrations have been suggested as a tool of predicting enteric methane (CH4) in ruminants because of the common biochemical pathways among CH4 and precursors of de novo synthesized FA (acetate and butyrate) in the rumen. Published relationships between CH4emissions and milk FA concentrations were established in cows receiving lipid supplements, indicating that milk FA profile may be a potential indicator of CH4production.
DescripciónConferencia invitada presentada al Proceedings of the 16th AAAP Animal Science Congress Vol. I. (Gadjah Mada University, Yogyakarta, Indonesia, 10-14 noviembre 2014).
Versión del editorhttp://aaap2014.ugm.ac.id/
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