The Nutritive Value of Rice Straw in Relation to Variety, Urea Treatment, Location of Growth and Season, and its Prediction from in Sacco Degradability원문보기
Soebarinoto, Soebarinoto
(Faculty of Animal Husbandry, Brawijaya University)
,
Chuzaemi, Siti
(Faculty of Animal Husbandry, Brawijaya University)
,
van Bruchem, Jaap
(Wageningen Institute of Animal Sciences, Department of Animal Production Systems, Agricultural University)
,
Hartutik, Hartutik
(Rowett Research Institute)
,
Mashudi, Mashudi
(Faculty of Animal Husbandry, Brawijaya University)
Ten rice varieties were planted at two locations (lowland and highland), during the wet and dry seasons of different years. In vivo digestibility and voluntary intake of the straw, were determined in groups of fat-tail sheep, supplemented with $18g{\cdot}kg^{-0.75}$ concentrate DM, contai...
Ten rice varieties were planted at two locations (lowland and highland), during the wet and dry seasons of different years. In vivo digestibility and voluntary intake of the straw, were determined in groups of fat-tail sheep, supplemented with $18g{\cdot}kg^{-0.75}$ concentrate DM, containing ~20% crude protein. Voluntary intake of digestible straw organic matter (DOMI) consistently varied from 15.2 to $20.9g{\cdot}kg^{-0.75}$ between straw varieties, averaged over locations, years and seasons, despite considerable variation between individual batches. This variation in the nutritive value of the straw was independent of straw and grain yield, so it would seem that there is scope for selection of rice varieties with straw of higher nutritive value. The variation in DOMI of straw among location of growth, year and season, was of a magnitude similar to the improvement brought about by urea-ammoniation. The in sacco degradation characteristics and digestibility of rice straw residues were superior to those of the offered straw. This can be attributed to a preference for rice straw leaves relative to stems. Averaged over location of growth, year and season, characteristics of in sacco degradation, i.e. the rate of fermentative degradation and the truly undegradable fraction, emerged as accurate predictors of the nutritive value of rice straw.
Ten rice varieties were planted at two locations (lowland and highland), during the wet and dry seasons of different years. In vivo digestibility and voluntary intake of the straw, were determined in groups of fat-tail sheep, supplemented with $18g{\cdot}kg^{-0.75}$ concentrate DM, containing ~20% crude protein. Voluntary intake of digestible straw organic matter (DOMI) consistently varied from 15.2 to $20.9g{\cdot}kg^{-0.75}$ between straw varieties, averaged over locations, years and seasons, despite considerable variation between individual batches. This variation in the nutritive value of the straw was independent of straw and grain yield, so it would seem that there is scope for selection of rice varieties with straw of higher nutritive value. The variation in DOMI of straw among location of growth, year and season, was of a magnitude similar to the improvement brought about by urea-ammoniation. The in sacco degradation characteristics and digestibility of rice straw residues were superior to those of the offered straw. This can be attributed to a preference for rice straw leaves relative to stems. Averaged over location of growth, year and season, characteristics of in sacco degradation, i.e. the rate of fermentative degradation and the truly undegradable fraction, emerged as accurate predictors of the nutritive value of rice straw.
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문제 정의
Moreover, this paper describes the accuracy of in sacco degradation characteristics as predictors of the nutritive value of rice straw in terms of voluntaiy intake of digestible organic matter. Based on the same sub아rates, the accuracy of prediction by parameters of cumulative in vitro gas production is described by Williams et al.
제안 방법
(1989) described the in vivo nutritive value of rice straw, grown in East-Java, Indonesia, showing that the variation among varieties, in terms of their digestible organic matter intake, was of a magnitude about similar to the increase brought about by urea-ammonia treatment. The current study was designed to further examine this phenomenon. Besides, the following objectives were considered.
대상 데이터
The WS1 rice straws, both treated with urea-ammonia (ratio urea:water:straw = 4: 50 :50, 7-14 days) and untreated, were evaluated for in vivo digestibility and voluntary intake with groups of three sheep. The WS2 and DS rice straws were evaluated with groups of five sheep. Adaptation and collection periods were observed, of 10 and 15 days, respectively.
이론/모형
Corrected for animal and period effects, the differences between diets were tested by the two-tailed Student t-test based on the LS means (df = 66). Some of the results are based on the WS2 and DS data only (df = 28).
성능/효과
This may in part be attributed to variation in feed intake behaviour among individual sheep. However, based on the data averaged over locations, years, seasons and treatments, rumen degradable organic matter (RDOM) was not significantly related to S0M nor la응 time LT0M. However, it was positively related to D°m and the in sacco rate of degradation (k^0M)? and negatively to UOm- The mean derived value for rumen degradable organic matter was significantly related to DOMI (figure 4).
However, no difference was established between locations. In comparison with the wet season, the dry season dOM and DOMI were, on average, 5.6 and 12.4% higher, concomitant with lower lignin and silica, but with increased hemicellulose contents. Further, the regression analysis identified cellulose as a negative factor.
In conclusion, there is consistent variation in the nutritive value of rice straw associated with location of growth, year and season, for different rice cultivars. This variation is of a similar magnitude to the incremental voluntary intake of straw digestible organic matter, brought about by urea-ammoniation.
The results of the experiment reported here, showed a variation in nutritive value of straw between years and seasons of a magnitude similar to that brought about by urea treatment. Digestibility and intake of dry-season straw was slightly superior to straw grown in the wet season.
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