@article {3672, title = {BRIEF COMMUNICATION: Behaviour and physiology of lambs with gastrointestinal nematode parasitism}, journal = {New Zealand Journal of Animal Science and Production}, volume = {82}, year = {2022}, month = {01/2022}, pages = {104-107}, address = {Online}, abstract = {The behaviour and physiology of lambs with gastrointestinal nematode infections (GIN) was evaluated. Thirty 8-month-old Romney wethers were assigned to one of two treatments (n=15/treatment) trickle dosed with either 1500 infective third stage larvae 3 days/week for 6 weeks (27,000 total L3; challenged), or water 3 days/week for 6 weeks (control). Blood and faecal samples were collected weekly during the study. Lipidomics were performed on plasma samples. Behaviour was observed from video-camera recordings once weekly over the study. At treatment week 4, specific triglycerides were elevated in the challenged lambs compared to controls (P<=0.05). Faecal egg counts were higher in challenged than control lambs from treatment week 4 (154 epg; P<=0.001). Challenged lambs had higher standing bouts at week 4 than baseline (5.6 bouts) whereas there were no differences in standing bouts for control lambs between baseline and week 4. Triglycerides and standing behaviour show promise for early identification of GIN.}, issn = {1176-5283}, author = {Hempstead MN and Waghorn TS and Gibson MJ and Sauermann CW and Ross AB and Cave VM and Sutherland MA and Sutherland IA} } @conference {41859, title = {A profile of anthelmintic resistance and parasite control practices in New Zealand - results from a 2005 survey}, booktitle = {Proceedings of the New Zealand Society of Animal Production}, volume = {66}, year = {2006}, month = {Jan}, pages = {14-19}, publisher = {New Zealand Society of Animal Production}, organization = {New Zealand Society of Animal Production}, address = {Napier}, abstract = {Anthelmintic (drench) resistance in New Zealand{\textquoteright}s ruminant livestock is arguably the biggest single threat to sustainable future pastoral production. Clinical and sub-clinical parasitism impacts not only on animal health, but on animal welfare, and hence the image of pastoral production systems, total production and production efficiency and has a marked impact on the economic bottom line for both farmers and the country as a whole. In 2001 it was estimated for the relatively small NZ deer industry alone (worth $311 million in export earnings) that parasitism cost $12.8 million per annum in production losses due to parasitism and parasite control (Mackintosh and Wilson, 2002).}, issn = {1176-5283}, author = {Rhodes AP and Leathwick DM and Pomroy WE and West DM and Jackson R and Lawrence K and Moffat J and Waghorn TS} } @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} }