Corn wet distillers grains with solubles (WDGS) included up to 25% in the diet of 16 Simmental dairy cows, 27 to 72 months old, during three weeks, negatively affected rumen function monitored by non-invasive parameters, such as fecal consistency, and also influenced milk quality by reducing milk fat content. Dry distillers' grains with solubles (DDGS) are currently the most attractive by-product of the bioethanol industry due to the possibility of application in the diet of various animal species, whereas WDGS is often more locally available and financially affordable; however, there is little data in the literature indicating potential negative consequences of its use. Therefore, this report aims to point out, based on a practical example, the possible problems of its application in the diet of dairy cows as the most metabolically sensitive category, as well as to demonstrate steps to prevent and/or mitigate eventual errors.
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