Factors associated with fetal losses in ewe lambs on a New Zealand sheep farm

References

• Cousins DV, Ellis TM, Parkinson J, McGlashan CH. Evidence for sheep as a maintenance host for Leptospira interrogans serovar hardjo. Veterinary Record 124, 123–4, 1989 doi: 10.1136/vr.124.5.123
   PubMed Web of Science ®Google Scholar
• Dorjee S, Heuer C, Jackson R, West DM, Collins-Emerson JM, Midwinter AC, Ridler AL. Prevalence of pathogenic Leptospira spp. in a sheep in a sheep-only abattoir in New Zealand. New Zealand Veterinary Journal 56, 164–70, 2008 doi: 10.1080/00480169.2008.36829
   PubMed Web of Science ®Google Scholar
• *Dreyfus A, Verdugo C, Benschop J, Collins-Emerson JM, Wilson PR, Heuer C. Leptospirosis sero-prevalence and associated economic loss in New Zealand livestock. Proceedings of the Food Safety, Animal Welfare and Biosecurity, Epidemiology and Animal Health Management, and Industry Branches of the NZVA. 291, 3.12.11–13.12.10, 2011
   Google Scholar
• Ellis WA, Bryson DG, Neill SD, McParland PJ, Malone FE. Possible involvement of leptospires in abortion, stillbirths and neonatal deaths in sheep. Veterinary Record 112, 291–3, 1983 doi: 10.1136/vr.112.13.291
   PubMed Web of Science ®Google Scholar
• *Faine S (ed). Guidelines for the control of leptospirosis. http://apps.who.int/iris/bitstream/10665/37219/1/WHO_OFFSET_67_%28p1-p98%29.pdf?ua=1 (accessed 18 March 2015). World Health Organisation, Geneva, Switzerland, 1982
   Google Scholar
• Gerritsen MJ, Koopmans MJ, Peterse D, Olyhoek T. Sheep as maintenance host for Leptospira interrogans serovar Hardjo subtype Hardjobovis. American Journal of Veterinary Research 55, 1232–7, 1994
   PubMed Web of Science ®Google Scholar
• Jefferies BC. Body condition scoring and its use in management. Tasmanian Journal of Agriculture 32, 19–21, 1961
   Google Scholar
• Hathaway SC. Leptospirosis in New Zealand: an ecological view. New Zealand Veterinary Journal 29, 109–12, 1981 doi: 10.1080/00480169.1981.34815
   PubMed Web of Science ®Google Scholar
• Howe L, West DM, Collett MG, Tattersfield G, Pattison R, Pomroy WE, Kenyon PR, Morris ST, Williamson NB. The role of Neospora caninum in three cases of unexplained ewe abortions in the southern North Island of New Zealand. Small Ruminant Research 75, 115–22, 2008 doi: 10.1016/j.smallrumres.2007.08.001
   Web of Science ®Google Scholar
• Howe L, Collett MG, Pattison RS, Marshall J, West DM, Pomroy WE. Potential involvement of Neospora caninum in naturally occurring ovine abortions in New Zealand. Veterinary Parasitology 185, 64–71, 2012 doi: 10.1016/j.vetpar.2011.10.033
   PubMed Web of Science ®Google Scholar
• Kenyon PR, Morris ST, Burnham DL, West DM. Effect of nutrition during pregnancy on hogget pregnancy outcome and birthweight and liveweight of lambs. New Zealand Journal of Agricultural Research 51, 77–83, 2008 doi: 10.1080/00288230809510437
   Web of Science ®Google Scholar
• Kenyon PR, Thompson AN, Morris ST. Breeding ewe lambs successfully to improve lifetime performance. Small Ruminant Research 118, 2–15, 2014. doi: 10.1016/j.smallrumres.2013.12.022
   Web of Science ®Google Scholar
• Leon-Vizcaino L, Hermosos de Mendoza M, Garrido F. Incidence of abortions caused by leptospirosis in sheep and goats in Spain. Comparative Immunology, Microbiology and Infectious Diseases 10, 149–53, 1987 doi: 10.1016/0147-9571(87)90009-9
   PubMed Web of Science ®Google Scholar
• *Marshall S. Investigation into severe foetal resorption found at scanning in hoggets. Proceedings of the 44th Annual Seminar, Society of Sheep and Beef Cattle Veterinarians of the New Zealand Veterinary Association. Pp 1–5, 2014
   Google Scholar
• Morris ST, Kenyon PR, West DM. Effect of hogget nutrition in pregnancy on lamb birth weight and survival to weaning. New Zealand Journal of Agricultural Research 48, 165–75, 2005 doi: 10.1080/00288233.2005.9513647
   Web of Science ®Google Scholar
• Morter RL, Langham RF, Morse EV. Experimental Leptospirosis. VI. Histopathology of the bovine placenta in Leptospira Pomona infections. American Journal of Veterinary Research 19, 785–91, 1958
   PubMed Web of Science ®Google Scholar
• *Mulvaney FJ. Investigating methods to improve the reproductive performance of hoggets. PhD thesis, Massey University, Palmerston North, NZ, 2011
   Google Scholar
• Mulvaney FJ, Morris ST, Kenyon PR, West DM, Morel PCH. Effect of nutrition around the time of breeding and during pregnancy on yearling liveweight change, pregnancy loss and live weight and survival of their offspring. Proceedings of the New Zealand Society of Animal Production 70, 91–5, 2010
   Google Scholar
• Murphy JC, Jensen R. Experimental pathogenesis of Leptospiral abortion in cattle. American Journal of Veterinary Research 30, 703–13, 1969
   PubMed Web of Science ®Google Scholar
• *Sakata E. The effect of liveweight and condition score at breeding and the change in these parameters from pre-breeding to mid-pregnancy on hogget reproductive performance. Postgraduate Diploma in Animal Science Thesis, Massey University, Palmerston North, NZ, 2011
   Google Scholar
• Wallace JM, Aitken RP, Cheyne MA. Nutrient partitioning and fetal growth in rapidly growing adolescent ewes. Journal of Reproduction and Fertility 107, 183–90, 1996 doi: 10.1530/jrf.0.1070183
   PubMedGoogle Scholar
• Wallace JM, Aitken RP, Cheyne MA, Humbolt P. Pregnancy-specific protein B and progesterone concentrations in relation to nutritional regimen, placental mass and pregnancy outcome in growing adolescent ewes carrying singleton foetuses. Journal of Reproduction and Fertility 109, 53–8, 1997 doi: 10.1530/jrf.0.1090053
   PubMedGoogle Scholar
• West DM. Ovine abortion in New Zealand. New Zealand Veterinary Journal 50 (supplement), 93–5, 2002 doi: 10.1080/00480169.2002.36279
   PubMed Web of Science ®Google Scholar
• *West DM, Collett MG, Perkins NR, Christodoulopoulos G, Morris ST, Kenyon PR. Investigations of foetal loss in maiden ewes. Proceedings of the 34th Annual Seminar, Society of Sheep and Beef Cattle Veterinarians of the New Zealand Veterinary Association. Pp 147–60, 2004
   Google Scholar