Document Detail

Management of dairy heifers and its relationships with the incidence of clinical mastitis.
MedLine Citation:
PMID:  17928896     Owner:  NLM     Status:  MEDLINE    
AIM: To describe aspects of management of dairy heifers before calving and determine risk factors for clinical mastitis postpartum in heifers, at the herd level, under pasture-based management systems in the Waikato and Taranaki regions of New Zealand. METHODS: Dairy herdowners (n=578) provided information via a prospective survey about their practices for rearing heifers and management of mastitis. A proportion of herdowners (n=250) subsequently provided data on the cases of clinical mastitis in their herds, including the date, cow identification, age and quarter affected from cases occurring in the 4 months after the planned start of calving (PSC) in the subsequent lactation. The relationship between management factors and the proportion of heifers diagnosed with clinical mastitis within a herd was examined using bivariate and multivariate analyses. RESULTS: The herd average percentage of heifers with clinical mastitis was 13.6 (95% confidence interval (CI)=12.3-14.9)%, and multiparous cows with clinical mastitis was 9.0 (95% CI=8.2-9.8)% in the first 4 months of lactation. There were positive relationships between the proportion of heifers with clinical mastitis and average milk production per cow (kg milksolids/ lactation; p<0.001), number of cows milked per labour unit (p=0.003), stocking rate (<> 3.30 cows/ha; p=0.002), and incidence of clinical mastitis in multiparous cows (%/120 days; p<0.04), in the final multivariate model. The proportion of heifers with clinical mastitis per herd was lower in herds that milked their lactating cows in multiple groups (p=0.02). CONCLUSIONS: The risk of clinical mastitis in heifers was significantly associated with management practices. It may be possible to reduce the incidence of clinical mastitis in heifers by modification of management practices at the herd level, and further studies are required to investigate this.
K I Parker; C W R Compton; F M Anniss; A M Weir; S McDougal
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Publication Detail:
Type:  Journal Article; Multicenter Study    
Journal Detail:
Title:  New Zealand veterinary journal     Volume:  55     ISSN:  0048-0169     ISO Abbreviation:  N Z Vet J     Publication Date:  2007 Oct 
Date Detail:
Created Date:  2007-10-11     Completed Date:  2007-11-26     Revised Date:  2009-11-11    
Medline Journal Info:
Nlm Unique ID:  0021406     Medline TA:  N Z Vet J     Country:  New Zealand    
Other Details:
Languages:  eng     Pagination:  208-16     Citation Subset:  IM    
Animal Health Centre, PO Box 21, Morrinsville, New Zealand.
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MeSH Terms
Animal Husbandry*
Mastitis, Bovine / epidemiology*,  etiology,  prevention & control*
New Zealand / epidemiology
Prospective Studies
Risk Factors

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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