Conventional wisdom has linked milk butterfat depression mostly to low fiber content. Theories on what creates this problem are now shifting, says Dr. Bill Mahanna, coordinator of global nutritional sciences for Pioneer Hi-Bred. Studies indicate that as a result of higher-energy silage corn rations, trans-fatty acids from oils in forages and grains may account for much of this depression. The wisest preventative course may be to work with a nutritionist to monitor these trans-fatty acids for prevention of ruminal acidosis.

Dr. Bill Mahanna on milk butterfat depression (4 min MP3)

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