02677naa a2200265 a 450000100080000000500110000800800410001910000180006024501020007826000090018052019160018965000110210565000230211665000100213965000180214965000240216765300170219165300260220865300230223465300310225770000210228870000190230970000250232877300580235315303732023-12-07       1998    bl uuuu     u00u1 u    #d1 aNIEZEN, J. H.  aProduction, faecal egg counts and worm burdens of ewe lambs which grazed six contrasting forages.  c1998  aLambs were grazed on monospecific swards of one of six forages, some containing condensed tannins (CT); sulla (Hedysarum coronarium), Lotus corniculatus and L. pedunculatus and some without CT (lucerne (Medicago sativa), plantain (Plantago lanceolata) and a ryegrass/white clover pasture (Lolium perennelTrifolium repens» to evaluate effects of forage type on gastrointestinal nematode burdens, faecal egg count as weIl as liveweight gain (LWG), wool growth and dag formation over a 42-day period. A new allotrnent of feed was provided at seven-day intervals, and feed was available ad libitum. Total worm burdens in a pre-treatrnent slaughter group were ca. 22000 of which ca. 5000 were in the abomasum. Within each forage type, 10 of the 25 lambs (NP) were given an anthelmintic drench at 14-day intervals and the remaining 15 lambs (P) were Dot drenched. Daily gains of the NP lambs were double that of P lambs which grazed either L comiculatus, lucerne or pasture, but parasitism had a lesser effect on performance of lambs which grazed sulla and L pedunculatus. Plantain was Dot palatable and ail lambs performed poorly. Highest daily gains in P lambs were for those which grazed sulla (175 g/day) and L pedunculatus (160 g/day) with total worm burdens of 13 100 and 23000 for the respective treatment groups. The other forages resulted in lower daily LWG in P lambs, and performance was Dot related to either worm burdens or worm species. This experiment bas shown that, when sulla is fed, there is a reduction in worm burdens and faecal egg count (FEC), but with Maku lotus which also controns CT, the good level of performance was achieved despite in high worm burdens and FEC. The mechanisms by which these forages enable high levels of productivity in the face of a parasitism appear to differ, but both could be incorporated into forage feeding systems to reduce dependence on anthelmintic drenches.  aAlfafa  aLotus Corniculatus  aOvino  aParasitologia  aPlantago Lanceolata  aEctoparasito  aHedysarium coronarium  aLotus pedunculatus  aNematódeo gastrintestinal1 aROBERTSON, H. A.1 aWAGHORN, G. C.1 aCHARLESTON, W. A. G.  tVeterinary Parasitologygv. 80, n. 1, p. 15-27, 1998.