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Dried Citrus Pulp as a Grain Replacement for Awasi Lambs^{1, 2,}

American University of Beirut,^,4 Lebanon

Abstract

Two experiments were conducted to study the energy value and palatability of citrus pulp. The wet pulp was dried at a temperature of 90 C without removing the seeds or extracting the molasses. The resultant dried citrus pulp contained 8.1% crude protein, 11% crude fiber, 73% nitrogen free extract, and 14% sugar on dry matter basis. One-half of the protein in citrus pulp was true protein. The protein was low in lysine. In the first experiment, four digestion and metabolism trials were conducted with eight wether lambs to study the utilization of nutrients in citrus pulp. The control ration contained 60% corn. Thirty-three, 66 and 100% of the corn was replaced by citrus pulp in the experimental rations. A palatability study was conducted in the second experiment involving eight sheep in two 4 x 4 latin square designs. Rations fed were similar to those of experiment one, except that each diet contained 10% molasses. The dry matter digestibility and palatability of the rations showed no significant differences among treatments. The average ad libitum daily intake and the dry matter digestibility of the rations were approximately 1 kg and 79%, respectively. The crude fiber digestibility of the rations increased at each increase in the level of citrus pulp while the energy digestibility was significantly lower at 60% level of pulp incorporation. The average total digestible nutrient and digestible energy of citrus pulp calculated by difference was approximately 80% and 3,503 kcal/kg, respectively.

¹ Journal No. 320 of the Faculty of Agricultural Sciences, AUB.

² Appreciation is expressed to Bonjus, Lebanon, for kindly supplying the wet pulp and to Anjar Sugar Factory, Lebanon, for drying the pulp.

³ Taken from M.S. thesis submitted by the author to the Faculty of Agricultural Sciences, AUB.

⁴ Department of Animal Science.