Nutritive value of straw, with special reference to wet-season rice straw as related to variety and location of growth in East-Java, Indonesia.

Variation in nutritive quality between morphological components is less for rice straw than for wheat straw. Wheat straw stems have a lower quality than stems of rice straw, while leaves and leaf sheaths of wheat are of better quality than of rice. Variation in voluntary organic matter intake, and in vivo and in sacco organic matter digestibility was studied with straw of 10 rice varieties grown in two locations (highland and lowland) in two years in Indonesia. Variation in nutritive quality was observed between varieties. Variation in DOMI was higher than in vivo OMD. In sacco degradation parameters were poor predictors of in vivo OMD and DOMI. Grain yield of the rice varieties studied was positively correlated with DOMI.