Effect of main roughages on the palatability by lactating dairy cows of total mixed rations with green tea waste silage
2007
Bayaru, E.(National Inst. of Livestock and Grassland Science, Nasushiobara, Tochigi (Japan). Nasu Research Station) | Nishida, T. | Matsuyama, H. | Hosoda, K. | Shioya, S. | Nonaka, K. | Yamada, A.
Effect of the main roughage on palatability of total mixed rations (TMR) with green tea waste silage (TWS) was examined for lactating dairy cows. In experiment 1, the main roughage in TMR (basal diet) was timothy hay, and the TWS addition rate was 1.25, 2.5, 5, 10 or 20% of TMR on a dry matter basis. In experiment 2, the main roughage in TMR (basal diet) was corn silage, and the TWS proportion was 2.5, 5, 10 or 20% of TMR on a dry matter basis. Four lactating Holstein cows were used for each experiment, and feed intake and preference index were measured. In experiment 1, the feed intake of test diets containing TWS of 1.25, 2.5 and 5% was almost similar to that of the basal diet. The lower discrimination threshold (LDT) of TWS was estimated at 8.1%. On the other hand, in experiment 2, the feed intake of test diets containing TWS of 2.5, 5 and 10% was almost similar to that of the basal diet, and LDT of TWS was estimated at 14.7%. The results show that the upper limit of TWS mixing rate could be 8 and 15% in TMR with timothy hay and corn silage as a main roughage, respectively.
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