Figure 2

Strong responder (low FEC) and poor responder (high FEC) phenotypes among Nigerian WAD goats. A. Haemonchus contortus faecal egg counts in two groups of humid zone Nigerian WAD goats. All the animals were given the same exposure to infective larvae of the parasite: 500 L3 on day 0, 1000 on d9 and d16, 2000 on d 23 and 32 and 3000 on d39. The High FEC values are the mean (± S.E.M.) FEC from the 18 goats with highest overall total egg output over the period of observation and the Low FEC group are the 18 goats with the lowest values across the period. Three goats with intermediate FEC were not included in these calculations. For further details see ref [36]. B. Distribution of FEC phenotypes in naturally acquired infections. Overall percentage of high, intermediate and low infection levels with GI nematodes in savannah WAD goats, based on faecal egg counts (FEC), as reflected in the percentage of goats at two markets (Akpagher and Gboko), classified in FEC class 0 (no eggs detected), FEC class 1 (1-50EPG), FEC class 2 (51-1500 EPG) and FEC class 3 (>1500 EPG). Akpagher is shown in stippled columns and Gboko in open columns. The predominance of low FEC (strong responder) phenotypes is apparent. For further details see ref [35].