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Reproductive performance of Thoroughbred mares in the Waikato region of New Zealand: 1. Descriptive analyses.
MedLine Citation:
PMID:  22905831     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
Abstract AIM: To describe the reproductive performance of a population of Thoroughbred mares on stud farms in the Waikato region of New Zealand. METHODS: A prospective cohort study was performed involving five stud farms in the Waikato region of New Zealand during three consecutive breeding seasons (2006-2008). A total of 1,482 individual mares contributed 2007 mare years and 3,402 oestrous cycles over the three breeding seasons. Mares were served by 87 individual stallions. RESULTS: The mean first-cycle pregnancy rate (FCPR) was 53.6%, the end-of-season pregnancy rate (SPR) was 85.3% and the foaling rate was 80.2%. There were significant differences amongst farms for FCPR (range 47.3-68.2%; p<0.01), SPR (range 81.4-92.6%; p<0.001) and foaling rate (range 77.8-90.1%; p<0.001). There were significant differences amongst stallions in their FCPR (range 38-74%; p<0.001) and SPR (range 72-97%; p<0.001).The proportion of pregnancies lost between day 14-16 and day 42 of gestation was 5.5% and the proportion of pregnancies lost between day 42 and term was 3.0%. Mares older than 14 years of age and barren mares had the highest pregnancy loss rates. Of all pregnancies diagnosed at 14-16 days, 12.9% were multiple pregnancies. The length of the breeding season was relatively short with 87.3% of services occurring in the 91-day period between 1 September and 30 November. CONCLUSIONS: The reproductive performance of Thoroughbred mares in the Waikato region of New Zealand was similar to that reported from other major Thoroughbred breeding countries. Although the per-cycle pregnancy rates in this study were lower than those reported in some studies, the foaling rate was similar to previous reports and this was achieved during a relatively short breeding season.
Authors:
Dw Hanlon; M Stevenson; Mj Evans; Ec Firth
Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-8-21
Journal Detail:
Title:  New Zealand veterinary journal     Volume:  -     ISSN:  0048-0169     ISO Abbreviation:  N Z Vet J     Publication Date:  2012 Aug 
Date Detail:
Created Date:  2012-8-21     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0021406     Medline TA:  N Z Vet J     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Affiliation:
a Matamata Veterinary Services Ltd , 26 Tainui St , Matamata , New Zealand.
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