TABLE 3-1Proportion of Starch Digested at Base (dStarch_Starch_base) for Various Starch Sourcesa

FeeddStarch_Starch_base
  • Default
0.91
  • Corn grain, dry, fine grind (<1,250 μm)b
0.92
  • Corn grain, dry, medium grind (1,500 to 3,250 μm)
0.89
  • Corn grain, dry, coarse grind (>3,500 μm)
0.77
  • Corn grain, high moisture, fine grind (< 2,000 μm, mean = 1,450 μm)
0.96
  • Corn grain, high moisture, coarse grind (>2,500 μm, mean = 3,630 μm)
0.90
  • Corn grain, steam flaked
0.94
  • Sorghum grain, dry, ground
0.83
  • Sorghum grain, steam flaked
0.94
  • Corn silage <30 percent DM
0.91
  • Corn silage 32–37 percent DM
0.89
  • Corn silage >40 percent DM
0.85
  • Grain sorghum silagec
0.85
  • Barley, steam rolled
0.94
  • Barley, ground
0.91
  • Wheat
0.93
a

Coefficients were derived from experiments, reviews, and meta-analyses using lactating dairy cows (Bal et al., 1997; Cammell et al., 2000a,b; Firkins et al., 2001; Ferraretto et al., 2013).

b

Because of incomplete data, particle size classifications for corn grain are not continuous. For corn with particle sizes not listed, interpolation can be used.

c

Based on data from beef cattle (Gutierrez et al., 1982; Hart, 1987).

From: 3, Energy

Cover of Nutrient Requirements of Dairy Cattle
Nutrient Requirements of Dairy Cattle: Eighth Revised Edition.
National Academies of Sciences, Engineering, and Medicine; Division on Earth and Life Studies; Board on Agriculture and Natural Resources; Committee on Nutrient Requirements of Dairy Cattle.
Washington (DC): National Academies Press (US); 2021 Aug 30.
Copyright 2021 by the National Academy of Sciences. All rights reserved.

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