01456naa a2200241 a 450000100080000000500110000800800410001910000170006024501290007726000090020652007300021565000230094565000180096865000170098665000190100365000170102265300180103965300140105765300230107170000170109470000170111177300860112815223852023-11-16       1976    bl uuuu     u00u1 u    #d1 aHORAK, I. G.  aLive mass gains and wool production of merino sheepbthree treatment programmes for parasite control.h[electronic resource]  c1976  aAbstract: A trial is described comparing the live mass gains and wool production of three groups of Merino sheep treated either at four-weekly intervals, strategically or not at all for the control of helminths and Oestrus ovis during a 19 month period. The group treated at four-weekly intervals had the greatest gain in masass was not greater than that of the group treated strategically. At both shearings the four-weekly treated group produced more wool than did the strategically treated group. The latter group produced more wool in total than did the untreated group. The seasonal incidence of nematodes, cestodes and Oestrus ovis on the trial farm was determined by the slaughter of tracer lambs at regular intervals.  aDisease prevention  aHelminthiasis  aParasitology  aSheep diseases  aOestrus Ovis  aHaemonchiasis  aNematodeo  aTrichostrongylosis1 aHONER, M. R.1 aSCHRODER, J.  tJournal South African Veterinary Associationgv. 47, n. 4, p. 247-251, Dec. 1976.