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 AJPS  Vol.5 No.7 , March 2014
Nutrient Composition of Pastures in Kayunga District, Uganda: A Preliminary Investigation with Implications for Seasonal Supplementation in Grazing Ruminants
Ellen S. Dierenfeld*, Ben Lukuyu, David Nyagaka
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Abstract: Proximate nutrient composition (crude protein, non-fiber carbohydrates, crude fiber, and ash), fiber fractions (neutral detergent fiber (NDF), acid detergent fiber (ADF), lignin), and both macro (calcium (Ca), phosphorus (P), magnesium (Mg), potassium (K), sodium (Na), and sulfur (S)) and trace (copper (Cu), iron (Fe), manganese (Mn), molybdenum (Mo), and zinc (Zn)) mineral profiles were quantified in mixed pasture samples collected during the wet (n = 8) and dry (n = 15) seasons in north central Uganda. Metabolizable and Net Energy values for dairy production were estimated based on standard calculations, and samples were compared seasonally. Crude fat (p = 0.05) and lignin (p = 0.01) values were lower in the dry compared with the wet season, linked with reduced plant growth. Crude protein (13.0% of dry matter (DM)), fiber fractions, and calculated energy content did not vary seasonally in this data set, and reflected chemical components of a grass-dominated system that appeared energetically limiting for production livestock. Mineral constituents varied more dramatically by season, with Ca, Mg, Cu, and Mn lower (all < 0.05) and K higher in the dry season. Sodium was deficient in these pastures, whereas Ca, P, Mg, S, Cu, and Zn concentrations may have been only marginally sufficient, particularly to meet needs for lactation, dependent on season. These limited data suggest that a high-energy mineral supplement may prove beneficial in meeting nutritional and production needs of multiple grazing ruminant species in this region, particularly during dry seasons.
Keywords: Cattle; Forage; Minerals; Nutrition
Cite this paper: Dierenfeld, E. , Lukuyu, B. and Nyagaka, D. (2014) Nutrient Composition of Pastures in Kayunga District, Uganda: A Preliminary Investigation with Implications for Seasonal Supplementation in Grazing Ruminants. American Journal of Plant Sciences, 5, 985-989. doi: 10.4236/ajps.2014.57111.
References

[1]   Mulindwa, H., Galukande, E., Wurzinger, M., OkeyoMwai, A. and Sölkner, J. (2009) Modelling of Long Term Pasture Production and Estimation of Carrying Capacity of Ankole Pastoral Production System in South Western Uganda. Livestock Research for Rural Development, 21, Article #151. http://www.lrrd.org/lrrd21/9/muli21151.htm

[2]   Okello, S., Sabiiti, E.N., and Schwartz, H.J. (2005) Factors Affecting in sacco Dietary Degradation by Ankole Cattle Grazing Natural Range Pastures in Uganda. African Journal of Range & Forage Science, 22, 157-165.
http://dx.doi.org/10.2989/10220110509485875

[3]   Bredon, R.M. and Horell, C.R. (1961) The Chemical Composition and Nutritive Value of Some Grasses in Uganda. 1 General Pattern of Behaviour of Grasses. Nature, 194, 702-703. http://dx.doi.org/10.1038/194702a0

[4]   Sabiiti, E.N. and Mugerwa, J.S. (1988) Forage Research and Development for Livestock Production in Uganda. In: PANESA/ARNAB (Pastures Network for Eastern and Southern Africa/African Research Network for Agricultural By-Products), Ed., Utilization of Research Results on Forage and Agricultural By-Product Materials as Animal Feed Resources in Africa, Proceedings of the First Joint Workshop, Lilongwe, 5-9 December 1988, PANESA/ARNAB, Addis Ababa, 833p. http://www.fao.org/wairdocs/ILRI/x5536E/x5536e0d.htm

[5]   Dermauw, V., Yisehak, K., Belay, D., Van Hecke, T., Du Laing, G., Duchateau, L., and Janssens, G.P.J. (2013) Mineral Deficiency Status of Ranging Zebu (Bos indicus) Cattle around the Gilgel Gibe Catchment, Ethiopia. Tropical Animal Health and Production, 45, 1139-1147. http://dx.doi.org/10.1007/s11250-012-0337-4

[6]   Schillhorn van Veen, T.W. and Loeffler, I.K. (1990) Mineral Deficiency in Ruminants in Sub-Saharan Africa: A Review. Tropical Animal Health and Production, 22, 197-205. http://dx.doi.org/10.1007/BF02241018

[7]   National Research Council (2001) Nutrient Requirements of Dairy Cattle. 7th Revised Edition, The National Academies Press, Washington DC.

[8]   National Research Council (2000) Nutrient Requirements of Beef Cattle. 7th Revised Edition, The National Academies Press, Washington DC.

[9]   National Research Council (2007) Nutrient Requirements of Small Ruminants: Sheep, Goats, Cervids, and New World Camelids. The National Academies Press, Washington DC.

 
 
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