Abstract 189

Sudana,-IB

Dep. Nutrition and Tropical Forage Science, Faculty of Animal Husbandry, Udayana Univ., Denpasar, Bali, Indonesia.

Ruminant feeding systems utilizing fibrous agricultural residues - 1986. Proceedings of the Sixth Annual Workshop of the Australian-Asian Fibrous Agricultural Residues Research Network, Los Banos, 1-3 April 1986 [edited by Dixon, R. M.]. 1987, 121-125; 12 ref. Canberra, Australia; International Development Program of Australian Universities and Colleges Limited (IDP).

Samples of straw from both lowland, irrigated areas (IR 56) and upland, unirrigated areas (Gogo) of Bali were collected at harvest time directly from the field. The straw and the plant fractions were analysed for organic matter (OM) and crude protein (CP). DM digestibility was estimated using nylon bags incubated in the rumen for 12, 24 and 48 h and T50 was calculated. The variety of straw and the plant fractions affected (P<0.05) OM, CP, DM digestibility and T50. IR 56 was of better nutritional quality, as its chemical composition and its DM digestibility were better than for Gogo rice straw. Among the plant fractions of both varieties of rice straw, the stem had the highest (P<0.05) DM digestibility; its DMD was 6 to 13 percentage units higher and its T50 was 4 to 13 h less than for the other plant fractions.