Location: Dairy Forage Research
Project Number: 5090-31000-025-04-A
Project Type: Cooperative Agreement
Start Date: Oct 1, 2016
End Date: Aug 31, 2018
To evaluate treated corn stover pelleted with different sources of protein feedstuffs on lactation performance and nutrient digestibility of lactating dairy cows.
Two experiments will be conducted to evaluate processed corn stover pelleted with protein feedstuffs as a feed ingredient in the diets of lactating dairy cows. The first experiment will evaluate the effect of source of protein supplements and effect of processing of those protein supplements pelleted with processed corn stover on intake, milk production, milk composition, and nutrient digestibility of lactating dairy cows. Twenty lactating Holstein dairy cows will be used in a 5 x 5 Latin square design. The following five dietary treatments will be evaluated: 1) soybean meal and treated corn stover diet; 2) processed soybean meal and treated corn stover diet; 3) distillers dried grains with solubles (DDGS) and treated corn stover diet (DDGS will be what is currently available on the market containing approximately 7.5% to 8% fat); 4) processed DDGS and treated corn stover diet; and 5) control/baseline diet. Diets will contain traditional feeds including corn silage and alfalfa haylage commonly used in lactating dairy cow rations. No treated corn stover will be included in this diet. The second experiment will evaluate pelleted stover feedstuffs in a longer-term feeding study to determine impact of lactation performance. Thirty-six to forty-five cows will be fed a common covariate diet for two weeks followed by a 12-week experiment evaluating the inclusion of pelleted corn stover feedstuffs. The experimental design will be a randomized completed block design. Diets will be balanced to meet the nutrient requirements for the lactating dairy cow.