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Fig. 5. Relationships of total cell wall polysaccharide degradability with Klason lignin (a) and ferulate ether (b) concentrations for maize stem internodes, averaged across three hybrids and 2 yr, after 24- (
) and 96-h (
) in vitro ruminal incubations for 10 sampling dates. The arrow located between the fifth and sixth sampling dates represents the approximate time when elongation of the internodes ceased. Bars represent one standard error of the mean. Absence of error bars indicates that the standard error was smaller than the size of the data symbol. Linear regressions were calculated for degradability with Klason lignin (24 h = 956 – 3.61KL, r2 = 0.99; 96 h = 1067 – 3.51KL, r2 = 0.99) and polynomial regressions of degradability with ferulate ethers (24 h = 903 – 46.00FE – 9.29FE2, r2 = 0.998; 96 h = 937 – 4.66FE – 13.45FE2, r2 = 0.999). Sampling Dates 1 through 3 and 8 through 10 were excluded from the regressions for Klason lignin and ferulate ethers, respectively.
