TY - JOUR
T1 - Rumen Turnover and Digestion of Normal and Brown Midrib Sorghum × Sudangrass Hybrid Silages in Dairy Cattle
AU - Wedig, C. L.
AU - Jaster, E. H.
AU - Moore, K. J.
AU - Merchen, N. R.
PY - 1987
Y1 - 1987
N2 - Eight growing Holstein heifers and four ruminally cannulated adult Holstein steers fed ad libitum were used in 4 × 4 Latin square designs. Diets included two sorghum × sudangrass varieties, Redlan × Greenleaf and Redlan × Piper, and their corresponding brown midrib mutants. Acid detergent fiber and acid detergent lignin concentrations tended to be lower for brown midrib mutants than for normal genotypes of the same variety. Digestion kinetics for in situ studies showed no difference in rate constants between normal and brown midrib sorghums, but extent of digestion at 72 h was significantly higher for brown midrib mutants than for normal genotypes, suggesting that lignin has no effect on digestion rate but does result in a decreased extent of digestion. In growing dairy heifers, brown midrib sorghum × sudangrass had higher digestibilities for organic matter, neutral detergent fiber, acid detergent fiber, cellulose, and hemicellulose fractions than did the normal genotype for Redlan × Greenleaf.
AB - Eight growing Holstein heifers and four ruminally cannulated adult Holstein steers fed ad libitum were used in 4 × 4 Latin square designs. Diets included two sorghum × sudangrass varieties, Redlan × Greenleaf and Redlan × Piper, and their corresponding brown midrib mutants. Acid detergent fiber and acid detergent lignin concentrations tended to be lower for brown midrib mutants than for normal genotypes of the same variety. Digestion kinetics for in situ studies showed no difference in rate constants between normal and brown midrib sorghums, but extent of digestion at 72 h was significantly higher for brown midrib mutants than for normal genotypes, suggesting that lignin has no effect on digestion rate but does result in a decreased extent of digestion. In growing dairy heifers, brown midrib sorghum × sudangrass had higher digestibilities for organic matter, neutral detergent fiber, acid detergent fiber, cellulose, and hemicellulose fractions than did the normal genotype for Redlan × Greenleaf.
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U2 - 10.3168/jds.S0022-0302(87)80134-0
DO - 10.3168/jds.S0022-0302(87)80134-0
M3 - Article
C2 - 3611478
AN - SCOPUS:0023355146
SN - 0022-0302
VL - 70
SP - 1220
EP - 1227
JO - Journal of Dairy Science
JF - Journal of Dairy Science
IS - 6
ER -