Abstract
A total of 147 ewes, 4 rams and 188 lambs of their progeny of the Djallonké breed of sheep were used to study the factors affecting reproductive and growth traits and the causes of lamb mortality. Data on ewes were collected during a 12-month period, while those on the lambs born to 123 of the ewes were collected until they were 12 months of age. The average fertility and abortion rates were 0.84 and 0.09. The fertility rate increased and the abortion rate decreased with increasing age of the ewes (p<0.05). The number of lambs born per ewe joined, litter weight at birth per ewe joined and litter weight at weaning per ewe joined were 1.28, 3.5 kg and 17 kg, respectively. The average numbers of lambs born per ewe, lambs born alive per ewe, lambs born dead per ewe and lambs per ewe that died between birth and weaning were 1.53, 1.43, 0.03 and 0.3, respectively. The age of the ewes significantly (p<0.05) affected all these traits except the number of dead lambs and the index of fertility (94%). The age of the ewes significantly (p<0.05) affected the birth weight and the weight at 6 and 12 months of age, whereas the lambing season significantly (p<0.05) affected all the growth traits studied. The type of birth was the most important source of variation in body weights of lambs. Sex had no significant (p>0.05) effect on the growth traits studied. The complex `starvation–bad management–light body weight at birth' caused 48% of the lamb mortality between birth and weaning, while diarrhoea, pneumonia and internal and external parasites caused approximately 52% of the lamb mortality over the same period. The seasonal raw mortality rate of the lambs before weaning was highest in the humid season.
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REFERENCES
Ahmed, A.M., Galal, E.S.E. and Younis, A.A., 1992. Estimates of productive and reproductive performances of a commercial flock of Barki sheep. Egypt Journal of Animal Production, 29, 109-122
Aziz, M.A. and Abdelsalam, M.M., 1993. Additive and multiplicative correlation factors for lamb birth weight in some Egyptian breeds. Alexandria Journal of Agriculture Research, 38, 139-151
Bathael, S.S. and Leroy, P.L., 1996. Growth and mature weight of Mehraban fat-tailed sheep. Small Ruminant Research, 22, 155-162
Bekele, T., Woldeab, T., Lahlou-Kassi, A., Sherinton, J. and Kassi-A-Lahlou, 1992. Factors affecting morbidity and mortality on-farm and on-station in the Ethiopian highland sheep. Acta Tropica, 52, 99-109
Dalton, D.C., 1979. Sources of perinatal mortality. In: Proceedings of the 29th Lincoln College Farmers Conference, Canterbury, New Zealand, May 19–21.
Duncan, N.B., 1955. Multiple range and multiple F test. Biometrics, 11, 1-4
Hassan, H.A., 1993. The effect of crossing Chios rams with Ossimi and Saidi ewes on growth and viability of lambs. Egyptian Journal of Animal Production, 30, 39-53
London, J.C. and Weniger, J.H., 1995. Investigations into traditionally managed Djallonké sheep produced in the humid and sub-humid zones of Asante, Ghana. III. Relationship between birth weight, pre-weaning growth, and post-weaning growth of lambs. Journal of Animal Breeding and Genetics, 112, 431-453
Magid, A.F., Swanson, V.B., Brinks, J.S., Dickerson, G.E. and Smith, G.M., 1981. Border Leicester and Finnsheep crosses. II. Productivity of F1 ewes. Journal of Animal Science, 52, 1262-1271
Mourad, M., 1994. Estimation of genetic and phenotypic parameters of some reproductive traits of African Common goats in Rwanda. Small Ruminant Research, 15, 67-71
Mourad, M. and Balde, I.B., 1997. Causes of small ruminant mortality on the Plateau of Sankaran, Faranah Guinea in 1992–1993. Revue d'Elevage Méditerranée Vétérinaire des Pays Tropicaux, 50, 84-88
Ndamukong, K.J.N., Sewell, M.M.H. and Asanji, M.F., 1989. Traditional sheep and goat production in North West Province, Cameroon. African Small Ruminant Research and Development, Proceedings of a Conference held at Bamenah, Cameroon, January 1989, (ILCA, Addis Ababa, Ethiopia), 129-144
Njau, B.C., Kasali, O.B., Scholtens, R.G. and Mesfin Degefa, 1988. Field and Laboratory Study of Sheep Mortality Causes on the Ethiopian High Plateau, (CIPEA, Addis Ababa, Ethiopia), 25-29
SAS, 1988. SAS/STAT User's Guide, (Release 6.03), (SAS Institute, Cary, NC)
Yapi Gnaore, C.V., Oya, A., Rege, J.E.O. and Bagnogo, B., 1997. Analysis of an open nucleus breeding program for Djallonké sheep in the Ivory Coast. 1. Examination of non-genetic factors. Animal Science, 64, 291-300
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Mourad, M., Gbanamou, G. & Balde, I. Performance of Djallonké Sheep under an Extensive System of Production in Faranah, Guinea. Tropical Animal Health and Production 33, 413–422 (2001). https://doi.org/10.1023/A:1010595823660
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DOI: https://doi.org/10.1023/A:1010595823660