Tuesday, August 6, 2013

Fecal Egg Counts Decline

Fecal egg counts declined, even among untreated goats. For the untreated goats (n=30), July 25 fecal egg counts ranged from 85 to 11,275 epg and averaged 3,269 + 3268 epg. The median egg count was much less, 1,625 epg. Untreated means the goat was not dewormed on July 11.

For the treated goats (n=40), fecal egg counts ranged from 0 to 5,567 epg and averaged 370 + 868 epg. The median egg count was 240 epg.  Treated means the goat was dewormed with either levamisole (1.5x sheep dose) or moxidectin (2x sheep dose) on July 11.

For the goats dewormed on July 11, a fecal egg count reduction was calculated. For the 35 goats with fecal egg count data on both days, fecal egg count reduction ranged from -355 to 100 percent + 96.6 percent. The median reduction in fecal egg counts was 91.8 percent.

The anthelmintic treatments were largely effective as indicated by the median (91.8 percent), but quite variable in response among individual goats, as evidenced by the large standard deviation (96.6 percent).

For all the goats in the test, regardless of treatment status, fecal egg counts ranged from 0 to 14,680 epg and averaged 1,620 + 2,628 epg on July 25, compared to 2,473 on July 11. The large standard deviation (2678 epg) and low median egg count (only 450 epg) shows the wide variation in July 25 egg counts. Treatment status would account for most of the variability.

Deworming decisions are based primarily on FAMACHA© scores and the criteria of the Five Point Check©, not fecal egg counts. On the day that the goats are weighed and evaluated, the fecal egg count data is already two weeks old.

Download July 27 FEC report