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To explore the effects of dietary starch on rumen health and milk fat production in lactating dairy cattle fed reduced-forage rations.

Evaluating dietary starch concentrations in reduced-forage rations fed to lactating dairy cattle

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To explore the effects of dietary starch on rumen health and milk fat production in lactating dairy cattle fed reduced-forage rations.
In a replicated 3 × 3 Latin square design, six ruminally cannulated Holstein cows were assigned to diets with 24%, 28%, or 32% starch.
Starch was increased by replacing soybean hulls with corn grain.
Data were analyzed using linear mixed models.
Increasing starch concentration (24% to 32%) reduced NDF digestibility but did not affect dry matter intake or milk yield.
Milk fat percentage and yield decreased with increasing starch, along with short-chain milk fatty acids and increased trans-10, cis-12 conjugated linoleic acid.
Energy-corrected milk was reduced when higher starch levels were fed.

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Randomized trial evaluates the impact of starch on milk production in lactating dairy cattle, implying dietary adjustments are needed.

Moussiaux et al. (2026) studied this question.

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