@conference {40924, title = {Liveweight gain and parasite resistance of lambs treated with slow-release albendazole capsules.}, booktitle = {Proceedings of the New Zealand Society of Animal Production}, volume = {57}, year = {1997}, month = {Jan}, pages = {191}, publisher = {New Zealand Society of Animal Production}, organization = {New Zealand Society of Animal Production}, abstract = {It has been reported that non-parasitised lambs treated with an oral oxfendazole drench had higher live weight gain and a reduced immune response to gastrointestinal para-sites than untreated controls (Stankiewicz et al., 1994). The aim of this trial was to determine whether treating lambs with controlled-release albendazole capsules had any ef-fect on the performance of non-parasitised lambs fed a low or high protein diet and on subsequent resistance to larval challenge.}, issn = {1176-5283}, author = {Niezen JH and Robertson HA} } @conference {40711, title = {The effect of six herbages on liveweight gain, wool growth and faecal egg count of parasitised ewe lambs}, booktitle = {Proceedings of the New Zealand Society of Animal Production}, volume = {55}, year = {1995}, month = {Jan}, pages = {199-201}, publisher = {New Zealand Society of Animal Production}, organization = {New Zealand Society of Animal Production}, issn = {1176-5283}, author = {Robertson HA and Niezen JH and Waghorn GC and Charleston WAG and Jinlong M} } @conference {40552, title = {Lamb weight gain and faecal egg count when grazing one of seven herbages and dosed with larvae for six weeks}, booktitle = {Proceedings of the New Zealand Society of Animal Production}, volume = {54}, year = {1994}, month = {Jan}, pages = {15-18}, publisher = {New Zealand Society of Animal Production}, organization = {New Zealand Society of Animal Production}, abstract = {One hundred and forty Polled Dorset lambs were randomly allocated to graze one of seven herbages (n = 20/herbage) and either trickle dosed (n=12) with a total of 108,000 third stage gastrointestinal nematode larvae (50\% Trichostrongylus colubriformis and 50\% Ostertagia circumcincta) over 6 weeks, or undosed (n=8) and allowed to ingest any nematode larvae on pasture. After 28 days on the trial lambs dosed with larvae had higher (P<0.001) faecal egg counts (FEC{\textquoteright}s) than undosed lambs but after 42 days egg counts did not differ (P>0.05) between dosed and undosed groups. Dosing with larvae did not significantly alter the liveweight gain (LWG). Herbage species affected LWG, being highest on lotus (Lotus pedunculatus cv Maku) and lowest on ryegrass/white clover (Lolium perenne/Trifolium repens), with other treatments being intermediate. Dosed lambs grazing chicory (Chicorium intybus) had more faecal dags than any other group of lambs. Those grazing G27 red clover (Trifolium pratense) were worst afflicted by a dermatitis type condition commonly referred to as trefoil dermatitis. Plasma pepsinogen levels differed significantly (P<0.05) only between dosed and undosed groups grazing pawera red clover, ryegrass/white clover and sulla (Hedysarium coronarium). Worm counts were undertaken on ryegrass/white clover and sulla grazed lambs. Both dosed and undosed groups grazing ryegrass/white clover had higher (P<0.05) abomasal worm counts than sulla grazed lambs, intestinal worm counts were highest in dosed lambs grazing ryegrass/white clover, intermediate in the dosed lambs grazing sulla and in undosed lambs grazing ryegrass/white clover, and lowest in the undosed lambs grazing sulla. }, issn = {1176-5283}, author = {Niezen JH and Waghorn TS and Raufaut K and Robertson HA and McFarlane RG} } @conference {40497, title = {Internal parasites and lamb production - a role for plants containing condensed tannins?}, booktitle = {Proceedings of the New Zealand Society of Animal Production}, volume = {53}, year = {1993}, month = {Jan}, pages = {235-238}, publisher = {New Zealand Society of Animal Production}, organization = {New Zealand Society of Animal Production}, abstract = {An intensive evaluation of the hormones that are primarily involved in regulating reproductive function in cows treated with progestins was undertaken and comparisons were made to cows with a functional corpus luteum. Cows with a functional corpus luteum were found to have reduced circulating luteinizing hormone (LH) and oestradiol than cows treated with a single progesterone releasing intravaginal device (PRID), norgestomet (progestin used in Syncro-Mate-B synchrony) or melengestrol acetate (progestin used for oestrous synchrony in the USA). If greater doses of progesterone than that released from a single PRID are used, concentrations of LH and oestradiol are like those of control cows in the midliteal phase of their oestrous cycle. In addition, conception rates are significantly improved when greater doses of progesterone are used compared to that of cows in which oestrus is synchronised with a single PRID. We propose that one reason for reduced conception with oestrous synchrony programmes presently in use is the failure of the progestins to effectively mimic the function of the corpus luteum.}, issn = {1176-5283}, author = {Niezen JH and Waghorn TS and Waghorn GC and Charleston WAG} } @conference {40307, title = {The effect of three allowances of red clover on Red deer fawn growth and liveweight change in lactating hinds}, booktitle = {Proceedings of the New Zealand Society of Animal Production}, volume = {51}, year = {1991}, month = {Jan}, pages = {185-188}, publisher = {New Zealand Society of Animal Production}, organization = {New Zealand Society of Animal Production}, abstract = {The binding of monoclonal antibodies (MAbs) of predetermined specificity to growth hormone (GH) can result in significant enhancement of the biological activity of the hormone in vivo. The topographic region on GH associated with the enhancement phenomenon has been localised to two proximate sites on adjacent loop regions by extensive peptide synthesis (sequences: 35-53 and 134-154). The application of these observations of GH and (ii) increased production parameters following administration of particular antibodies. The latter aspect has now been demonstrated in a number of animal models by the passive vaccination of animals with purified anti-peptide antisera or monoclonal antibodies. Production parameters affected in such experiments include growth rate, fat metabolism, diabetogenic activity and lactation in ewes. At the present time, it has been shown that peptide sequence 134-154 will elicit up to 80\% high titre, immuno- positive responders in sheep. Monitoring the growth rate and other production parameters of lambs vaccinated with sequence 134-154 indicates improved growth and total protein characteristics. These observations, in conjunction with the development of methodologies for effective autoimmunization of animals, may provide a basis for the design of peptide vaccines to improve animals, may provide a basis for the design of peptide vaccines to improve animal production. }, issn = {1176-5283}, author = {Niezen JH and Barry TN and Hodgson J and Wilson PR and Holmes CW} }