J. Anim Sci.
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J. Anim Sci. 1977. 44:1119-1126.
© 1977 American Society of Animal Science
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Comparison of Number Nematode Eggs from and performance of Calves Early-Weaned with Calves Nursing Dams on Pasture

W. E. Neville, Jr.1, T. B. Stewart2 and W. C. McCormick1 ,3,

Coastal Plain Experiment Station, Tifton, GA 31794

Abstract

Thirty-four Angus and 32 Polled Hereford calves, averaging 60 (50 to 75) days of age and 77 (64 to 89) kg weight, were assigned to three treatments. Treatment 1 calves were weaned and fed a concentrate mixture on permanent summer pasture. Treatment 2 calves were weaned and fed an all-in-one ration in dry lot. Treatment 3 calves were maintained with their dams (non-creep fed) on permanent summer pastures. Fecal samples, obtained once each month (28 days) for 6 months, were examined for eggs of four groups of nematode parasites: Haemoncbus placei and Oesophagostomum radiatum (HO); Cooperia spp., Ostertagia ostertagi and Trichostrongylus spp. (COT), Bunostomum phlebotomum (BO); and Strongyloides papillosus (STR).

Calves on treatment 3 had significantly (P<.01) more parasite eggs per gram (EPG) of feces (156) than those on treatment 1 (57) or treatment 2 (61) for HO. For STR, calves on treatment 2 had significantly (P<.01) higher EPG counts (3.98) than those on treatment 3 (2.56). The difference between Angus and Polled Hereford calves was significant (P<.01) for HO (118 and 59, respectively) and for STR (2.69 and 3.83, respectively). The EPG counts for STR and total eggs had a significant (P<.01) linear reduction and HO, COT, STR and total eggs had a significant quartic effect over the range of the six periods. Daily gains due to treatments were significantly (P<.01) different. They were .967, .821 and .711 kg for treatment 1, 2 and 3, respectively. Low and nonsignificant (P>.05) correlations were obtained between daily gain and the EPG count of the various types of parasite eggs.

Footnotes

1 Department of Animal Science.

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

3 The authors gratefully Acknowldege the assistance of Mr. B. G. Mullinix for conducting the Statistical analyses and Mr. O. G. Marti for technical Assistance.






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Copyright © 1977 by the American Society of Animal Science.