Friday, August 10, 2012

Egg counts continue to climb

For the individual samples collected on July 26, fecal egg counts ranged from 0 to 6425 eggs per gram (epg) and averaged 1316 ± 1303 epg. The median egg count was 938 epg. Two weeks ago, individual egg counts averaged 818 ± 1104 epg and the median was 575 epg.

When the goats arrived on June 2, egg counts averaged 2437 ± 3337 epg. The median was 1257 epg. After the triple deworming, average egg counts were reduced to 28 ± 77 epg. The median was 0. Since then, egg counts have been gradually increasing. The higher egg counts help to explain the higher FAMACHA© scores recorded yesterday.

#51 is one of the most resistant bucks in the test (86 epg avg.)
Consigner:  Jill Zink (Indiana)

The standard deviation (STDEV) is also increasing, meaning there is more variability in the egg counts. This is good because it means we are getting some separation between the resistant and susceptible bucks in the test.

To meet the Gold standards of the test, bucks must not have an egg count over 1,000 epg or an average egg count over 500 epg. For the Silver standard, the highest allowable egg count is 1,500 epg and the average egg count must not exceed 750 epg. Goats meeting the Bronze standard cannot have an egg count above 2,000 epg and their average must not exceed 1,000 epg.

For the samples collected on July 26, twenty-two of the bucks (45%) had egg counts above 1000 epg. Fourteen (29%) had egg counts above 1500 epg. Twelve (24%) had egg counts above 2,000 epg.

#28's (right) average fecal egg count is only 231 epg.
Consigner: Randy & Jodie Majancsik (Kentucky)

While no egg counts are removed from the data set, sometimes we are not able to get a fecal sample from a goat. When a goat does not have a fecal sample, it is put back in the handling system and checked a second time. Because the fecal egg count is the result of management before the test started, the June 2 egg counts are not included in the data set. They are used primarily to determine the efficacy of the initial combination treatment.

According to one source, (Australia), 2000 epg is considered to be of clinical significance for the barber pole worm (Haemonchus contortus). Compared to other worms, the barber pole worm is a prolific egg producer; hence, higher egg counts.  The pooled sample collected on June 28 contained 95 percent barber pole worm eggs.

It is not known if the artificial dosing with larvae is having any effect on egg counts (probably not, as it was a very low dose).  The current environmental conditions (warm + moist) are conductive to barber pole worm development.

Download July 26 FEC report
Download parasite resistance rankings