ASSESSING THE SUITABILITY OF THE LEE-CARTER MODEL IN MODELLING MORTALITY DATA WITH VARYING bx PARAMETER
DOI:
https://doi.org/10.33003/fjs-2023-0703-1874Keywords:
Lee-Carter model, ARIMA, Singular value Decomposition, Mortality RateAbstract
The Lee-Carter model, developed by Lee and Carter in 1992 is one of the most influential model among others that is used for mortality projection. Although the model's performance has so far been examined in a variety of situations, its effectiveness in modeling mortality data with varying speeds of change in mortality across ages and the ability to detect trends in mortality index more precisely over time has not been studied. The method traditionally used in the Lee-Carter model shows obvious drawbacks in describing the shape of future mortality. The effectiveness of the Lee-Carter model to model mortality data with varying speeds of change in mortality was investigated. The model was applied to mortality data with both constant and varying speeds of change for female sub population. Results show that the Lee-Carter model is not good for mortality data with varying speeds of change.
References
Aduku, J. K. (2004). Mucuna: Herbaceous cover legume with potential multiple use. Resource and crop management. Research monograph. No 35. International Institute of Tropical Agriculture, Ibadan, Nigeria.
Ahamefule, F. O., Ibeawuchi, J. A. and Nwachinemere, G. C. (2007). Comparative evaluation of milk yield and compositions of West African Dwarf goats raised in the village and university environment. Journal of Animal and Veterinary Advances, 6(6):802 - 806.
Akpa, G. N., Osuhor, C. U., Olugbemi, T. S. and Nwani, P. I., (2003). Milk flow rate and Milking Frequency in Red Sokoto Goats. Pakistan Journal of Nutrition, 2(3):192-195.
Alawa, J. P. and Oji. U. I. (2008). Effect of Pendulous Udder Enlargement on Yield and Proximate Composition of Milk from Red Sokoto Goats. Journal of Animal and Veterinary Advances, 7: 870 – 872.
Al-Saiady, M. Y. (2011). Effect of restricted feeding, breed and diet on sheep milk yield. Journal of Applied Animal Research, 30(1): 85-88.
AOAC (Association of Official Analytical Chemists) (2007). Official Methods of Analysis. 19th
Edition. Washington DC.
Benchaar, C., Petit, H. V., Berthiaume, R., Ouellet, D. R., Chiquette, J. and Chouinard, P. Y. (2007). Effects of essential oils on digestion, ruminal fermentation, rumen microbial populations, milk production and milk composition in dairy cows fed alfalfa silage or corn silage. Journal of Dairy Science, 90(2): 886–889.
Devendra C. (1999). Goats: challenges for increased productivity and improved livelihoods. Outlook on Agriculture, 28: 215 – 226.
Eun, T. K. and Sung, S. L. (2015). Effects of flavonoid rich plant extracts on in vitro ruminal methanogenesis microbial population and fermentation characteristics. Asian-Australasian Journal of Animal Sciences, 28 (4): 530-537.
Food and Agriculture Organization of the United Nations (2019). Food and Agriculture Organization of the United Nations statistical databases. [cited 2019 Feb 16]. Available from: http://faostat.fao.org/
Gatemby, R. M. (2002). Sheep revised edition. Tropical Agricultural Series. Macmillan Publishers Ltd.
GPS (Global Positioning System) (2018).
Haenlein G. F. W. (2017). Why does goat milk matter? A review. Nutrition and Food Science International Journal, 2: 555594. doi: 10.19080/NFSIJ.2017.02.555594.
Haenlein G. F. W. and Wendorff W. L. (2006). Sheep milk production and utilization of sheep milk. In: Park, Y.W., Haenlein, G. F. W. (Eds), Handbook of milk of Non-Bovine Mammals. Blackwell publishing professional, Oxford, UK, and Ames, Iowa, USA, pp137 – 194.
Haenlein G. F. W. (2004). Goat milk in human nutrition. Small Ruminant Research, 51:155–63. doi: 10.1016/j.smallrumres.2003.08.010 [Google Scholar]
Hilow, S. A., Abidi, S. B., Jeremiah, E. and Abdullahi, H. Y. (2002). Ethnoveterinary medicine. In: Mathias E. and Mundy (Editors). Workshop on ethnoveterinary medicine held in Kenya.
Khalof, M., Morsay, T., Abdo, M. O., Matloup, B. and Abu EL-Ella, A. (2012). Effect of supplementing lactating goats rations with garlic, cinnamon or ginger oils on milk yield, milk composition and milk fatty acids profile. Journal of Life Science, l4(1): 27-34.
Malau-Aduli, B. S., Eduvie, L.O., Lakpini, C. A. M. and MaulauAduli, A. E. O., (2001). Effects of supplementation on the milk yield of Red Sokoto does. Proceedings of the 26 Annual conference of Nigerian Society for Animal Production, March, ABU, Zaria Nigeria pp353-355.
Midau, A. (2012). Goat Milk a Possible Alternative Source of Protein and Minerals to the Rural Poor populace in Nigeria. International Journal of Dairy Science, 7: 29 – 33.
Ohiokpehai, O., (2003). Processed Food Products and Nutrient Composition of Goat Milk. Pakistan Journal of Nutrition, 2 (2):68-71.
Park Y. W. (1994). Hypo-allergenic and therapeutic siginifance of goat milk. Small Ruminant Resrach, 14: 151 – 161.
Patra, A. K. and Saxena, J. (2010). A new perspective on the use of plant secondary metabolites to inhibit methanogenesis in the rumen. Phytochemistry, 71: 1198–1222.
Roy S. K. and Vadodaria V. P. (2006). Goat milk and its importance, Indian Dairyman, 58 (3): 65 – 69.
Sani, R. T., Lamidi, O. S., Achi, N. P., Idowu, W. U., Ishiyaku, Y. M., Ahmed, S. A. and Lawal H. B. (2023). Effect of feeding diet containing raw or parboiled rice offal on rumen metabolite of Bunaji bulls. FUDMA Journal of Sciences, (7): 84 – 90.
SAS (2005). Institute Incorporated SAS/STAT user’s guide. 6.03 Edition, Gray NC U.S.A
Simos, E., Voutsinas, L. P. and Pappas, C. P. (1991). Composition of milk of native Greek goats in the region of Metsovo. Small Ruminant Research, 4: 67-74.
Tassoul, M. D. and Shaver, R. D. (2009). Effect of a mixture of supplemental dietary plant essential oils on performance of periparturient and early lactation dairy cows. Journal of Dairy Science, 92(4): 1734 – 1740.
Wilson, J. R., Deinum, B. and Engles, F. M. (1991). Temperature effects on anatomy and digestibility of leaf and stem of tropical and temperate forage species. Netherland Journal of Agricultural Science, 39(1): 31 – 48.
Zahraddeen, D., Butswat, I. S. R. and Mbap, S. T. (2007). Evaluation of some factors affecting milk composition of indigenous goats in Nigeria. Livestock Research for Rural Development, (11): 19-20.
Zahraddeen, D., Butswat, I. S. R. and Mbap, S. T. (2009). A note on factors influencing milk yield of local goats under semi-intensive system in Sudan Savannah ecological zone of Nigeria. Livestock Research for Rural Development, (3): 21-22.
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