Alterations in mammary gland synthesis and secretion of fatty acids in response to trans isomers of octadecenoic acid or conjugated linoleic acid isomers

Abstract:

Experiments were conducted to investigate:(1) production of trans-18: 1 and cis/trans-18: 2 isomers due to input of forage and corn grain in continuous culture fermenters,(2) concentrations of trans-18: 1 and cis/trans-18: 2 isomers in blood and milk fat of grazing cows fed a grain supplement containing solvent-or mechanically-extracted soybean meal,(3) plasma and milk fatty acid profiles of lactating cows in response to a conjugated linoleic acid (CLA) mixture infused into the rumen, and (4) effects of cis9, trans11-18: 2 (9/11CLA) or trans10, cis12-18: 2 (10/12CLA) on de novo synthesis and desaturation of milk fatty acids in lactating cows fed unsaturated oils. In the first study, rumen fermenters were fed (50 g DM/d) orchardgrass or red clover with 0, 8, or 16 g/d corn replacing equal portions of forage DM. In the second experiment, Holstein cows grazing mixed clover-grass pastures were fed a grain supplement (6.7 kg …

Año de publicación:

2001

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