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Number of Nematode Eggs obtained from Early-Weaned Calves on Drylot and Suckling Calves on Pasture in South Georgia

Costal Plain Experiment Station, Tiflon, GA 31794

Abstract

Thirty-three Angus and 46 Polled Hereford calves were either weaned at an average age of 54 (21 to 60) days and fed in the drylot or maintained with their dams (non-creep fed) on permanent summer pastures. Fecal samples, obtained from all calves once each month during a 4-month period beginning at an average age of 122 (89-128) days, were examined for eggs of four groups of nematode parasites: Haemonchus placei and Oesophagostomum radiatum (HO); Cooperia spp., Ostertagia ostertagi and Trichostrongylus spp. (COT), Bunostomum phlebotomum (BO); and Strongyloides papillosus (STR).

The pasture calves passed significantly more parasite eggs per gram (EPG) of feces (86) than drylot calves (13) for HO (P<01), (18 and 14, respectively) for COT (P<01), and (168 and 78, respectively) for total parasite eggs (P-C01), but drylot calves passed significantly more EPG (24) than pasture calves (5) for BO (P<.01) and 2.54 and 2.33, respectively) for STR (P<01). Differences between Angus and Polled Hereford calves were significant (P<01) for HO EPG (58 and 19, respectively), and (2.22 and 2.55, respectively) for STR (P<.01). Significant (P<.01) interactions included location (drylot vs pasture) x type of parasite for each of the four sampling periods, breed X type of parasite for the first two sampling periods and location X period for HO, COT and BO. Breed X location interactions were not significant (P>.05) for each of the four types of parasites but were significant for the second and third sampling periods (P<.01). Correlations between daily gain and the EPG count of the various types of parasite eggs were low and insignificant.

¹ Animal Parasite Research Laboratory, A.R.S., U.S.D.A.

² Department of Animal Science.