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. 2014 Feb;27(2):187–193. doi: 10.5713/ajas.2013.13395

Table 2.

Effects of treatments on ruminal pH taken at 0, 2, 4, and 6 h post-feeding

Item Treatments1 EEM U-4.5 vs OPT-4.5 S:F ratio
U-4.5 OPT-6 OPT-4.5 OPT-3 Linear Quadratic
Ruminal pH
 0 h 6.60 6.47 6.56 6.76 0.12 0.19 0.06 0.19
 2 h 5.82 5.84 5.89 6.05 0.07 0.67 0.09 0.63
 4 h 6.20 5.80 6.11 6.15 0.09 0.48 0.04 0.32
 6 h 6.42 6.06 6.41 6.51 0.09 0.98 0.02 0.31
1

U-4.5 = Diet formulated to supply 2.14 Mcal/kg of NEm with a ratio of starch:FDA of 4.5, containing 0.80% of conventional urea as the sole source of NNP; OPT-6 = Diet formulated to supply 2.14 Mcal/kg of NEm with a ratio of starch:FDA of 6.0, containing 0.80% of conventional urea plus 1.00% of Optigen; OPT-4.5 = Diet formulated to supply 2.07 Mcal/kg of NEm with a ratio of starch:FDA of 4.5, containing 0.80% of conventional urea plus 1.00% of Optigen, and OPT-3 = Diet formulated to supply 2.00 Mcal/kg of NEm with a ratio of starch:FDA of 3.0, containing 0.80% of conventional urea plus 1.00% of Optigen (OPT-3).