Offered Papers Theme A: Efficient Production from Grassland
Description
Previous studies have shown that cis 9 trans 11 conjugated linoleic acid (CLA) concentrations are higher for summer milk produced from cows grazing fresh pastures than for winter milk when conserved forages are fed (Jahreis et al., 1997). Furthermore, Offer (2003) showed that a similar depression in milk fat CLA occurred if grass was simply cut and fed after a short wilt. This experiment investigated the effect of wilting on the production of CLA and trans vaccenic acid (TVA) in an in vitro rumen simulation, and whether any differences could be related to changes in plant structure. It was hypothesised that fresh turgid grass may have a greater propensity for cell damage during mastication than the much more flaccid wilted grass, which in turn may increase microbial metabolism of the grass lipid.
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Agricultural Science Commons, Agronomy and Crop Sciences Commons, Plant Biology Commons, Plant Pathology Commons, Soil Science Commons, Weed Science Commons
An In Vitro Investigation of Forage Factors Which Affect the Production of Conjugated Linoleic Acid and Trans Vaccenic Acid in the Rumen. II. Wilting & Cell Damage
Previous studies have shown that cis 9 trans 11 conjugated linoleic acid (CLA) concentrations are higher for summer milk produced from cows grazing fresh pastures than for winter milk when conserved forages are fed (Jahreis et al., 1997). Furthermore, Offer (2003) showed that a similar depression in milk fat CLA occurred if grass was simply cut and fed after a short wilt. This experiment investigated the effect of wilting on the production of CLA and trans vaccenic acid (TVA) in an in vitro rumen simulation, and whether any differences could be related to changes in plant structure. It was hypothesised that fresh turgid grass may have a greater propensity for cell damage during mastication than the much more flaccid wilted grass, which in turn may increase microbial metabolism of the grass lipid.
