Location: Cell Wall Biology and Utilization ResearchTitle: Effects of molasses and corn grain at 2 levels of ruminally degradable protein on lactating cow ruminal fermentation and rumen content mass
Submitted to: Meeting Abstract
Publication Type: Abstract Only
Publication Acceptance Date: 3/8/2018
Publication Date: 6/11/2018
Citation: Zanton, G.I., Hall, M. 2018. Effects of molasses and corn grain at 2 levels of ruminally degradable protein on lactating cow ruminal fermentation and rumen content mass. Journal of Dairy Science. 101(Suppl. 2): 94.
Technical Abstract: The objective of this study was to evaluate lactating dairy cow ruminal fermentation and rumen content mass with diets containing molasses (M) or finely ground dry corn grain at 3 levels of M (0, 5.25, 10.5% DM) and with differing levels of ruminally degradable protein (+RDP or –RDP). Twelve ruminally cannulated, multiparous Holstein cows (initial mean±SD: parity 2.25±0.62; 185±56 DIM; 41.3±6.3 kg milk) were allocated to treatment sequences in a split-plot, replicated 3x3 Latin square design with a 2x3 factorial arrangement of treatments. Experimental diets were individually fed to cows for ad libitum consumption and formulated to contain 35% corn silage and 20% alfalfa silage with +RDP formulated with a greater concentration of solvent soybean meal (SBM) and expellers SBM replacing a portion of solvent SBM in -RDP. Each period lasted 28 d; on d 21 and 28 of each period, rumen contents of all cows were evacuated, subsampled, and replaced beginning 6 h after feeding. On d 25-28 of each period, samples of rumen contents were taken at 4 or 6 h intervals to represent every 2 h. Data were analyzed in SAS with significance was declared at P<0.05 and trends at 0.05