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https://hdl.handle.net/2440/117162
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Type: | Journal article |
Title: | Lack of association between Leptospira spp. serovars Hardjobovis and Pomona and pregnancy and mid-term abortion in New Zealand farmed red deer |
Author: | Patel, K. Howe, L. Haack, N. Heuer, C. Asher, G. Wilson, P. |
Citation: | Veterinary Microbiology, 2018; 215:83-89 |
Publisher: | Elsevier |
Issue Date: | 2018 |
ISSN: | 0378-1135 1873-2542 |
Statement of Responsibility: | K.K. Patel, L. Howe, N. Haack, C. Heuer, G.W. Asher, P.R. Wilson |
Abstract: | This paper investigates Leptospira borgpeterseni serovar Hardjobovis and L. interrogans serovar Pomona as potential causes of sub-optimum pregnancy rates and mid-term abortion in farmed red deer. Rising two-year-old (R2, n = 22,130) and mixed-age (MA, n = 36,223) hinds from 87 and 71 herds, respectively, throughout New Zealand were ultrasound scanned early in gestation (Scan-1) and a sub-sample re-scanned (Scan-2) 55-89 days later and mid-term daily abortion rate calculated. A sub-sample of sera from pregnant and non-pregnant hinds at both scans, both with (case herds) and without aborted hinds was tested for Leptospira using the microscopic agglutination test with titre cut-point ≥1:48 as positive. At Scan-1, 44.3% of 661 and 4.6% of 647 hinds were sero-positive for Hardjobovis and Pomona, respectively. The geometric mean titre (GMT) for Pomona was higher in pregnant than non-pregnant MA hinds (p = 0.015) but not in R2 hinds. At Scan-2 in case herds, 40.3% of 2242 and 7.1% of 2243 hinds were sero-positive for Hardjobovis and Pomona, respectively. There was no association between Hardjobovis or Pomona serology and non-pregnancy (Scan-1) or mid-term abortion (Scan-2) at animal or herd level. In case herds, GMT was higher in non-aborted than aborted hinds for Hardjobovis (p = 0.018) in MA herds and for Pomona in R2 herds (p = 0.006). No uteri from hinds not pregnant or aborting at either scan, or not rearing a calf to weaning, and fetuses as available, were positive on PCR. Evidence is insufficient to confirm that Leptospira Hardjobovis and Pomona play a significant role in sup-optimum early pregnancy or mid-term abortion rates in deer. |
Keywords: | Red deer; Leptospira; pregnancy; abortion; serology; PCR |
Rights: | © 2018 Elsevier B.V. All rights reserved. |
DOI: | 10.1016/j.vetmic.2018.01.008 |
Published version: | http://dx.doi.org/10.1016/j.vetmic.2018.01.008 |
Appears in Collections: | Animal and Veterinary Sciences publications Aurora harvest 8 |
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