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Genetic resistance to gastro-intestinal nematode parasites in Red Maasai, Dorper and Red Maasai X Dorper ewes in the sub-humid tropics

Published online by Cambridge University Press:  18 August 2016

R.L. Baker ,
D.M. Mwamachi ,
J.O. Audho ,
E.O. Aduda  and
W. Thorpe
R.L. Baker
Affiliation:
International Livestock Research Institute (ILRI), PO Box 30709, Nairobi, Kenya
D.M. Mwamachi
Affiliation:
Kenya Agricultural Research Institute (KARI), PO Box 16, Mtwapa, Kenya
J.O. Audho
Affiliation:
International Livestock Research Institute (ILRI), PO Box 30709, Nairobi, Kenya
E.O. Aduda
Affiliation:
International Livestock Research Institute (ILRI), PO Box 30709, Nairobi, Kenya
W. Thorpe
Affiliation:
International Livestock Research Institute (ILRI), PO Box 30709, Nairobi, Kenya
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Abstract

Resistance to naturally acquired gastro-intestinal (GI) nematode parasite infections (predominantly Haemonchus contortus) was studied in 166 Red Maasai, 230 Dorper and 294 crossbred (Red Maasai Х Dorper) ewes in the sub-humid coastal region of Kenya. Live weights (LWT), blood packed-cell volume (PCV) and faecal egg counts (PEC) were recorded at mating, 3 months post mating, 1 week before lambing and 1, 2 and 3 months post lambing for four separate lambings that took place between 1993 and 1996. The Red Maasai ewes were more resistant to GI nematode infections than Dorper ewes as shown by their significantly lower FEC and significantly higher PCV at most of the sampling times over the reproductive cycle. The breed difference for FEC was significant in the lactating ewes but not in the non-lactating ewes. At most sampling times, the crossbred ewes were as susceptible as the Dorper ewes in terms of both PCV and FEC, particularly at the 1 and 2 month post-lambing samplings. Resistance was also manifested by a lower proportion of ewes having to be treated with an anthelmintic and a lower mortality rate in the Red Maasai than the Dorper. The Red Maasai ewes were significantly lighter by about 1 to 2 kg than the Dorper ewes at all sampling times. There was a significant increase in FEC and decrease in PCV over the first 2 months of lactation in lactating ewes compared with non-lactating ewes. This peri-parturient increase in FEC occurred in both breeds and the crossbreds but was more marked in the susceptible Dorper ewes.

Keywords

genetic resistanceHaemonchus contortushumid tropicssheep

Information

Type
Research Article
Information
Animal Science , Volume 69 , Issue 2 , October 1999 , pp. 335 - 344
Copyright
Copyright © British Society of Animal Science 1999

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