produced significantly higher yield than close cutting (5 nitrogen balance. The minimum level of protein in feed, cm) and cutting every 2 months (3 times) tended to give to have adequate rumen fermentation, must contain higher yield than cutting more and less frequencies of 7%CP content (Minson, 1981). dwarf Napier grass. So, the results of this present study The average fraction of ADF and NDF in this experiment indicated that DMY of King Napier grass greatly related were 41.9 and 72.3% and similar to Queiro Filho et al. to cutting height and cutting intervals. High DMY may be (1998), who cut the Roxo elephant grass at the ground achieved by cutting more often with higher of cutting level with 40 day interval, received 41.6 and 71.8%, height, whereas lower of cutting height with longer respectively. In addition to, Nakamanee et al. (1996) cutting intervals may get high DMY as well. Because low showed cutting King Napier grass at 0-15 cm height and level cutting may loose more photosynthetic part and 40 days cutting interval received the average of ADF and use longer time for regrowth than the high level of cutting NDF were 44.9 and 69.0%. However, the fractions of (Walton, 1984). NDF and ADF, which normally increase with age of the
Nutritive values: There were no significant differences in Roxo elephant grass at 0, 15, 30, 45 cm height and 60 CP and DMD among treatments, ranging from 12.1-12.9 days interval obtained the averages of ADF and NDF and 75.5-76.6%, respectively. However, percentage of were 42.75 and 76.41%, when the cutting interval ADF, NDF (41.7, 43.5, 42.2 and 42.8; 64.6, 66.2, 65.6 extended to 90 days, the average of ADF and NDF and 65.4 %, respectively) were highly significantly higher decreased to 41.02% and 71.13%, respectively. (p<0.01) in T2, T3 and T4 compared with T1, but there Although, the result showed that cutting height had was no significant difference among T2, T3 and T4; different effect on ADF and NDF components. The forage whereas, percentage of Ash (14.7, 13.3, 13.2 and 13.1%, quantity of this study were higher than animal respectively) were highly significantly lower (p<0.01) in requirement which recommended by NRC (2001), the T2, T3 and T4 compared with T1, but there was no forage crops should have ADF and NDF not less than significant difference among T2, T3 and T4 (Table 4). 17% and 33 %, respectively. The different amount of ADF The average of CP percentage of the current study were and NDF in forage crops depend on varieties and age of similar to the results of Santos et al. (2001a) and plant (Preston and Leng, 1987). The percentage of ash Nakamanee et al. (1996), who worked with the same decreased with increasing level of cutting height. The cultivar in Chainat province, Thailand and obtained 8.9% current results are in agreement with Thinnakorn et al. CP. The average CP percentage of the present study (1995) who found that range of the ash content of King was 12.4%. This CP value is higher than CP level in Napier grass were 14.3-15.4%, when cut at 5-15 cm roughage that affects to animal’s intake. Milford and height and 30-35 days of cutting interval. Minson (1966) stated that the 7%CP was a critical level in the forage. If the CP content of the grass is less than Number of tillers and tiller weight: The effect of cutting 7%, it is factors limiting animal production due to low heights on Number of Tillers (NT) and Mean Tiller voluntary intake, lower rate of digestibility and negative Weight (MTW) of King Napier grass are presented in
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