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Factors restraining voluntary intake of rice straw seen through the relation between digestibility reticulo rumen retention time and total tract fill of rice straw rice straw crushed with husk machine and soaked with 10 percent sugar solution of wethers



Factors restraining voluntary intake of rice straw seen through the relation between digestibility reticulo rumen retention time and total tract fill of rice straw rice straw crushed with husk machine and soaked with 10 percent sugar solution of wethers



Japanese Journal of Zootechnical Science 49(8): 572-577



The causes of lower voluntary intake of rice straw and the estimated total alimentary tract fill under conditions which could increase the voluntary intake of rice straw in wethers was shown. A basal diet and feeding condition of this experiment were similar to a previous report though 3 sheep were used including the original 2. The reticulo-rumen retention time and estimated total alimentary tract fill of rice straw crushed with husk machine (crushing) and soaked in 10% sugar solution (soaking) were compared to rice straw (control). Daily dry matter intake of crushed and soaked rice straw was 128 and 118%, respectively, of control and the total dry matter intake per metabolic body size was 116 (crushing) and 111 (soaking) per cent. The significant differences (P < 0.05) of digestibility of each component in the total diets recognized among the treatments were as follows: crude fiber, crushing > the others; cellulose, crushing > control; N free extract; soaking > the others; and dry matter and digestible energy, soaking > control. The differences among the treatment with respect to the digested amount of each component in the diet were smaller than in the case of digestibility because of multiplication of intake and digestibility. The digested amount of N free extract, digestible energy and dry matter of soaking were significantly larger than in the other cases. The difference of digested amount of crude fiber was insignificant. The reticulo-rumen retention time of rice straw was about the same in the control and the crushing but was longer in the case of soaking. The differences of reticulo-rumen retention time of those treatments increased according to the increase of amount of intake. The average reticulo-rumen retention time of the control was less than in the cases of the crushing and the soaking -10 and 16%, respectively. The estimated total alimentary tract fill of the control was the lowest with a large difference though the reticulo-retention time differed little between the control and the crushing. The repressed intake of rice straw of the control apparently was not caused by the stagnation of rice straw in the reticulo-rumen.

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Accession: 005443100

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