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- Title
Rumen protected conjugated linoleic acid (CLA) methyl esters decrease milk fat and increase CLA concentration in goat milk.
- Authors
Gulati, S. K.; Wijesundera, C.; Byers, E.; Scott, T. W.
- Abstract
Background -- Conjugated linoleic acids (CLA's) are extensively bio-hydrogenated in the rumen by rumen micro-organisms. When CLA's are infused into the abomasum of dairy cows, milk fat content is reduced by 30-40%; the effect is due to the trans 10 cis 12 isomers (1, 3). Objective -- To protect CLA methyl esters (ME) from ruminal metabolism, (RP-ME-CLA) and to assess their effect on milk fat content and composition. Design -- The basal ration of 6 goats was supplemented with RP-ME-CLA containing 10g each of cis 9 trans 11and 10 trans cis 12 isomers, to assess their effects on milk fat composition. Outcomes -- RP-CLA-ME depressed milk fat content of goats by 35-40%; similar to CLA isomers infused into the abomasum (1) or where CLA-ME-calcium salts or RP-CLA-ME were infused intra-ruminally (3). Feeding RP-CLA-ME increased the level (g/100g) of cis 9 trans 11 and trans 10 cis 12 isomer in goat milk from 0.64±.04 to 4.07±0.22 and 0.0 to 2.8±0.17 respectively. The transfer of the cis 9 trans 11 and trans 10 cis 12 isomers from the supplement into milk fat was 20 and 13% respectively; values being higher than the transfer efficiency reported for cows where CLA-ME-calcium salts or RP-CLA-ME were infused intraruminally ie 3.2 and 7% respectively (3). Conclusions -- CLA-ME can be protected from ruminal metabolism. Inclusion of RP-CLA-ME supplement in the diet reduced milk fat content by 35-40% and significantly increased the concentration of CLA isomers in milk.
- Publication
Asia Pacific Journal of Clinical Nutrition, 2003, Vol 12, p27
- ISSN
0964-7058
- Publication type
Academic Journal