September 10, 2025Journal of Dairy ScienceOpen Access

Effect of dietary starch concentration and direct-fed microbial supplementation on lactation performance, total-tract nutrient digestibility, and enteric methane emissions by dairy cows

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Experiment reveals that dietary starch and direct-fed microbial affect nutrient digestibility and enteric methane emissions in dairy cows.

Diets with 27% starch reduced enteric methane emissions and improved feed efficiency compared to 21% starch diets.
Cows consuming direct-fed microbial displayed improved nutrient digestibility, enhancing lactation performance metrics.
Replacing high-moisture corn with soy hulls increased milk fat concentration but had no effect on overall milk yield.
Dietary treatments resulted in variations in eating behavior, with different starch levels affecting meal frequency and duration.

Juckem et al. (2025) studied this question.

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Experiment reveals that dietary starch and direct-fed microbial affect nutrient digestibility and enteric methane emissions in dairy cows.