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1997
Liveweight gain and parasite resistance of lambs treated with slow-release albendazole capsules., JH, Niezen, and HA Robertson , Proceedings of the New Zealand Society of Animal Production, Jan, Volume 57, p.191, (1997)
1995
The effect of six herbages on liveweight gain, wool growth and faecal egg count of parasitised ewe lambs, HA, Robertson, JH Niezen, GC Waghorn, WAG Charleston, and M Jinlong , Proceedings of the New Zealand Society of Animal Production, Jan, Volume 55, p.199-201, (1995)
1994
Lamb weight gain and faecal egg count when grazing one of seven herbages and dosed with larvae for six weeks, JH, Niezen, TS Waghorn, K Raufaut, HA Robertson, and RG McFarlane , Proceedings of the New Zealand Society of Animal Production, Jan, Volume 54, p.15-18, (1994)