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Biological and economic impact of trypanosome infections on milk production in N'Dama cattle managed under village conditions in The Gambia

Published online by Cambridge University Press:  02 September 2010

K. Agyemang ,
R. H. Dwinger ,
P. Jeannin ,
P. Leperre ,
A. S. Grieve ,
M. L. Bah  and
D. A. Little
K. Agyemang
Affiliation:
International Trypanotolerance Centre, PMB 14, Banjul, The Gambia
R. H. Dwinger
Affiliation:
International Trypanotolerance Centre, PMB 14, Banjul, The Gambia
P. Jeannin
Affiliation:
International Trypanotolerance Centre, PMB 14, Banjul, The Gambia
P. Leperre
Affiliation:
International Trypanotolerance Centre, PMB 14, Banjul, The Gambia
A. S. Grieve
Affiliation:
International Trypanotolerance Centre, PMB 14, Banjul, The Gambia
M. L. Bah
Affiliation:
International Trypanotolerance Centre, PMB 14, Banjul, The Gambia
D. A. Little
Affiliation:
International Trypanotolerance Centre, PMB 14, Banjul, The Gambia
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Abstract

Over a 3-year period, productivity characteristics and criteria of trypanosomiasis incidence and severity have been monitored by monthly examination of individual N'Dama cattle in villages in The Gambia. From this database, 60 lactating cows in which Trypanosoma congolense or T. vivax had been detected on blood examination (group 1) were compared with 50 cows which had not been found infected with trypanosomes during the monitoring period (group 2). The latter were selected on the basis of comparability of age and stage of lactation to those of group 1 for examining the effect of trypanosome infections on the quantity of milk extracted for human consumption, and on the growth of their sucking calves. Data from a 6- to 7-month period were examined in the analysis.

The quantity of daily milk extracted during the 1st month ot intection (group 1) decreased by proportionately 0·25 in comparison to the amount extracted during the preceding month when parasites were not detected. The corresponding figure in the uninfected controls (group 2) was 0·02. The mean daily milk extracted for human consumption from uninfected cows during a 6-month period was proportionately 0·26 higher than the mean for the infected cows. Growth rates of calves sucking infected and uninfected dams were similar.

These observations indicate that infection with pathogenic trypanosomes of lactating N'Dama cattle causes a reduction in milk production.

In economic terms, it was estimated that the decline in milk extracted for human consumption due to trypanosome infections amounted to an average of £1 per month per cow.

Keywords

Gambiamilk productionN'Damatrypanosomiasis
Type
Research Article
Information
Animal Production , Volume 50 , Issue 3 , June 1990 , pp. 383 - 389
Copyright
Copyright © British Society of Animal Science 1990

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References

REFERENCES

Agyemang, K., Jeannin, P., Grieve, A. S., Bah, M. L. and Dwinger, R. H. 1988a. Milk extraction for human consumption from N'Dama cattle under village management conditions in The Gambia. In Livestock Production in Tsetse Affected Areas of Africa. Proceedings of International Livestock Centre for Africal International Laboratory for Research on Animal Diseases Meeting, Nairobi, Kenya, 1987, pp. 231–245.Google Scholar
Agyemang, K., Jeannin, P., Grieve, A. S. and Dwinger, R. H. 1988b. Milk production of N'Dama cattle kept under village conditions in The Gambia. Nineteenth meeting of the International Scientific Council for Trypanosomiasis Research and Control. Lome, Togo, 1987. Organization of African Unity/Scientific, Technical and Research Commission Publication No. 114, pp. 234–238.Google Scholar
Harvey, W. R. 1977. Users' Guide for Least-Squares and Maximum Likelihood Computer Program. Ohio State University, Columbus.Google Scholar
Hornby, H. E. 1921. Trypanosomes and trypanosomiasis of cattle. Journal of Comparative Pathology 34: 221–240.Google Scholar
Ikede, B. O., Elhassan, E. and Akpavie, S. O. 1988. Reproductive disorders in African trypanosomiasis: a review. Ada Tropica 45: 5–10.Google ScholarPubMed
International Livestock Centre for Africa. 1986. The African Trypanotolerant Livestock Network. Indications from results 1983–1985, pp. 79–110. International Livestock Centre for Africa, Addis Ababa, Ethiopia.Google Scholar
Jeannin, P., Dwinger, R. H., Agyemang, K. and Grieve, A. S. 1988. Epidemiological investigations in Gambian cattle with an emphasis on trypanosomiasis. Nineteenth meeting of the International Scientific Council for Trypanosomiasis Research and Control, Lome, Togo, 1987. Organization of African Unity/Scientific, Technical and Research Commission Publication No. 114, pp. 222–233.Google Scholar
Luckins, A. G., Llewelyn, C., Munro, C. D. and Murray, M. 1986. Effects of pathogenic trypanosomes on the mammalian Reproductive System. In Nuclear and Related Techniques in Animal Production and Health in Different Environments. Vienna, 1986, pp. 351–363.Google Scholar
Maehl, J. J. H., Coulibaly, L., Defly, A., D'Ieteren, G. D. M., Feron, A., Grundler, G., Hecker, P., Itty, P., Mawuena, K., Morkramer, G., Mulungo, M., Nagda, S. M., Paling, R. W., Pelo, M., Rarieya, J. M., Schuetterle, A., Sheria, A., Thorpe, W. and Trail, J. C. M. 1988. Factors influencing liveweight in a range of Network situations. In Livestock Production in Tsetse Affected Areas of Africa. Proceedings of International Livestock Centre for Africa/International Laboratory for Research on Animal Diseases Meeting, Nairobi, Kenya, 1987, pp. 219–230.Google Scholar
Mulligan, H. W. 1970. The African Trypanosomiases, pp. 729–798. George Allen and Unwin, London.Google Scholar
Murray, M., Murray, P. K. and McIntyre, W. I. M. 1977. An improved parasitological technique for the diagnosis of African trypanosomiasis. Transactions of the Royal Society of Tropical Medicine and Hygiene 71: 325–326.Google Scholar
Paris, J., Murray, M. and McOdimba, F. 1982. A comparative evaluation of parasitological techniques currently available for the diagnosis of African trypanosomiasis in cattle. Ada Tropica 39: 307–316.Google ScholarPubMed