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KMID : 1025520030450050813
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Journal of Animal Science and Technology
2003 Volume.45 No. 5 p.813 ~ p.818
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The Survey of Particle Size of Total Mixed Ration in Korea
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기광석/Ki, K. S.
김현섭/정하연/이현준/안병석/김준식/강수원/Kim, H. S./Jeong, H. Y./Lee, H. J./Ahn, B. S./Kim, J. S./Kwang, S. W.
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Abstract
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This study was carried out to survey operation system of self-making TMR and particle size of self-making and commercial TMR, then to compare TMR particle size recommended by Penn State particle Size Separator. Daily mixing time in self-making TMR averaged 48.6±28.0min, 2 angar type of mixer was most by 55.5％ and daily 2 times of mixing in summer and other season was 44.4 and 22.2％, respectively. Percentage of residual feed in upper sieve(19㎜ diameter), middle sieve(8 ti 18㎜ diameter) and lower pen was 21.5~25.6%, 16.0~25.8%, 52.8~61.4%, respectively, at self-making TMR mixer. Percentage of particle sizes of more than 19㎜ in self-making and commercial TMR was 24.9±1.4 and 26.2±1.7％, that of 8-10㎜ 22.8±1.0 and 12.8±1.2 and that of less than 8㎜ 52.3±1.7 and 61.0±1.5, respectively, which in particle length of 8~13㎜ in self-making and commercial TMR was lower by 82.6 and 100％ compared to that recommended by Penn State particle separator, respectively. Especially there was not particle length of more than 19㎜ in commercial TMR at all. It is necessary to check the number of cows ruminating in a farm in order to estimate the particle size of TMR； it is recommended to change the TMR mixing time or the TMR formulae if the proportion of ruminating cows in a farm is less than 40％.
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