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Ruminant Nutrition and Forage Utilization
Asian-Australasian Journal of Animal Sciences 1998;11(6): 692-696.
https://doi.org/10.5713/ajas.1998.692    Published online December 1, 1998.
Effects of Type and Level of Forage Supplementation on Voluntary Intake, Digestion, Rumen Microbial Protein Synthesis and Growth in Sheep Fed a Basal Diet of Rice Straw and Cassava
S. Premaratne, J. van Bruchem, X. B. Chen, H. G. D. Perera, S. J. Oosting
An experiment was conducted with eight growing sheep (average initial weight 20.6 kg and average final weight 23.7 kg) in a 4횞4 Latin square design to study the effect of type of forage supplementation to a basal diet of rice straw (ad libitum) and cassava (Manihot esculanta, approximately 9 g of dry matter (DM). kg-0.75 day-1) on voluntary intake, digestion, rumen microbial protein synthesis and daily weight gain. Forages used were Leucaena (L, Leucaena leucocephala), Gliricidia (G, Gliricidia maculata) and Tithonia (T, Tithonia diversifolia, wild sunflower) at a DM supplementationlevel of approximately 13 g kg-0.75.day-1. Organic matter intake was 40.4, 55.5, 55.0 and 54.9 g kg.-0.75 day-1 for control (C, ad libitum straw and cassava), L, G and T. respectively, significantly lower for C than for the supplemented diets. Intake of supplementary forage had also a significantly positive effect on voluntary rice straw intake. All forage supplemented diets showed a significantly higher whole diet organic matter digestion than C (488g kg-1), while T (557 g kg-1) differed significantly from L (516 g kg-1) but not from G (526 g kg-1). Daily weight gain was -1.7, 5.2, 5.4 and 4.7 g kg-0.75, for C, L, G and T. respectively, significantly lower for C than for the forage-supplemented diets. Efficiency of microbial protein synthesis estimated from urinary excretion of purine derivatives was lower for C (3.8 g microbial N. (kg digestible organic matter intake (DOMI))-1 than for the forage supplemented diets (11.3, 9.0, and 9.4 g microbial N. (kg DOMI)-1 for L, G and T. respectively).
Keywords: Forage Supplementation; Intake; Digestibility; Rice Straw; Livestock Performance; Purine Derivatives

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