Gluconic acid was proposed as a prebiotic for nonruminants; however, a ruminant application is undescribed. The first experiment was a 5 × 5 Latin square with five test doses of calcium gluconate (CaG) at 0, 5, 17, 32, and 46 g d-1. Treatments were infused into the abomasum of lactating dairy cows for 28 d and milk was collected on days 26, 27, and 28. The second experiment was a crossover where cows (N = 30) were fed a total mixed ration (TMR) with (0.2% of dry matter) and without CaG for 28 d. Milk (days 26, 27, and 28) and blood (day 28) were collected from all cows and rumen fluid (day 28) from a subset of six rumen-cannulated cows. Infusion of CaG into the abomasum increased milk fat yield and decreased dry matter intake resulting in improved feed efficiency. In contrast, cows fed CaG in the TMR had decreased milk yield and milk protein and lactose yields compared with control. In the subset of rumen-cannulated cows, the proportion of butyric acid was decreased and acetic acid increased relative to total volatile fatty acid in cows fed CaG. These findings suggest that CaG utilization may be different in the rumen and lower gastrointestinal tract.
You have requested a machine translation of selected content from our databases. This functionality is provided solely for your convenience and is in no way intended to replace human translation. Neither BioOne nor the owners and publishers of the content make, and they explicitly disclaim, any express or implied representations or warranties of any kind, including, without limitation, representations and warranties as to the functionality of the translation feature or the accuracy or completeness of the translations.
Translations are not retained in our system. Your use of this feature and the translations is subject to all use restrictions contained in the Terms and Conditions of Use of the BioOne website.