The effect of byproducts from the corn grain processing on the postprandial dynamics of rumen pH
2011
Dragomir, C., National Research and Development Institute for Animal Biology and Nutrition (IBNA), Balotesti, Ilfov (Romania) | Toma, S., National Research and Development Institute for Animal Biology and Nutrition (IBNA), Balotesti, Ilfov (Romania) | Lević, J., Institute for Food Technology, Novi Sad (Serbia)
The effects of two fiber-rich byproducts of the corn grain processing on the postprandial dynamics of rumen pH were studied on three rumen cannulated non-lactating cows, within a 3x3 Latin square experimental design. The two byproducts, dried corn gluten feed (dCGF) and dried corn distillers grains (dCDG) replaced corn grains (C) in high concentrate diets, which suddenly replaced a standard diet (designed to ensure appropriate rumen activity) and were feed once a day. Rumen content was sampled every two hours, two days after the diet changes, during first 14 postprandial hours and pH was measured immediately. Average, pHmin and pHmax as well as duration and intensity of pH decrease were calculated for each series of pH measurements. Diets containing dCGF and dCDG led to higher average pH comparing to the corn-based diet: 6.26 +/- 0.03 and 6.12 +/- 0.12 versus 6.02 +/- 0.2, respectively (P is less than 0.05). Differences were more marked when duration and intensity of pH decrease were considered: corn diet led to a pH decrease below 6.0 of 8.02 +/- 2.58 hours, whereas for dCDG and dCGF diets the decreases were of 6.71 +/- 3.59 and 3.02 +/- 2.17 hours only. Relative differences were even higher when a lower pH threshold (5.8) was considered: observed values were 5.33 +/- 4.02, 3.14 +/- 3.64 and 0.83 +/- 1.24 for C, dCDG and dCGF diets, respectively. Of the two by-products, dCGF was more efficient against pH decrease after the sudden change from a low concentrate to a high concentrate diets. It is concluded that both by-products are feasible solutions to help limiting the pH decrease while allowing formulation of high energy and highly digestible diets for ruminants.
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