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Parasitism in Beef Yearlings as Related to Forage Availability and Levels of Protein Feeding

Georgia Agricultural Experiment Station,^,2 Experiment

Abstract

The differences in numbers of parasitic larvae recovered from animals in three types of lots appeared to be related to the availability and consumption of forage. Calves from drylot (no grass) had the lowest number of larvae and the highest number of adult worms, while calves from semi-drylot (limited grass) and pasture lots had significantly higher numbers of parasitic larvae and lower numbers of adult worms at postmortem.

The drylot and semi-drylot animals on high protein had lower numbers of larval stomach worms than those on low protein. The animals from pasture on high protein also had a much lower larval stomach worm population than those fed less protein; but, this latter difference could not be related to protein consumption because the pasture provided an excess of protein to both high and low protein groups.

There appeared to be an inverse correlation between average daily gains and average total worm loads of calves on the different treatments and levels of protein feeding but the results were not conclusive.

¹ Animal Diseases and Parasite Research Branch, A.R.S., U.S.D.A.

² Journal Series No. 289.