Genetic resistance to gastro-intestinal nematode parasites in Red Maasai, Dorper and Red Maasai X Dorper ewes in the sub-humid tropics
作者： R.L. Baker , D.M. Mwamachi , J.O. Audho , E.O. Aduda , W. Thorpe
DOI: 10.1017/S1357729800050906
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摘要: 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 the sub-humid coastal region of Kenya. Live weights (LWT), blood packed-cell volume (PCV) faecal egg counts (PEC) were recorded at mating, 3 months post 1 week before lambing 1, 2 for four separate lambings that took place between 1993 1996. The more resistant GI than as shown by their significantly lower FEC higher PCV most sampling times over reproductive cycle. breed difference significant lactating but not non-lactating ewes. At times, susceptible terms both FEC, particularly month post-lambing samplings. also manifested a proportion having be treated with an anthelmintic mortality rate Dorper. lighter about kg all times. There increase decrease first lactation compared This peri-parturient occurred breeds crossbreds marked
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