Tava A, Berardo N, Cunico C, et al. Cultivar differences and seasonal changes of primary metabolites and flavor constituents in tall fescue in relation to palatability. Journal of Agriculture and Food Chemistry, 1995, 43: 43-98.
Nordfeldt S, Iwanaga I, Morita K, et al. Influence of crude fiber in the ration on efficiency of feed utilization by dairy cows. Journal of Dairy Science, 1950, (33): 473-485.
Wang Z, Eastridge M L, Qiu X. Effects of forage neutral detergent fiber and yeast culture on performance of cows during early lactation. Journal of Dairy Science, 2001, (1): 204-212.