Document Detail


Dairy calf mortality rate: characteristics of calf mortality rates in Tulare County, California.
MedLine Citation:
PMID:  1155830     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Sixteen dairy farm owners in Tulare County, California, provided data on heifer calf births and deaths. Eleven of these dairymen had maintained records on the calves before this study was done, and 5 agreed to maintain them for 6 months. Basic statistical techniques, including time series analyses and life-table methods, were used to examine the data for temporal and demographic characteristics. Overall, the calf mortality rate on the 16 farms averaged 17.3 to 20.2%. The interfarm variation in mortality rate was large, ranging from 3.7 to 32.1%. Time series studies indicated that the extent of death losses increased during midsummer (June, July, August) and midwinter (November, December, January), with mortality rates in winter months being 20% greater than those in summer. Death losses in October and March were highly variable; however, losses in October usually exceeded the yearly average; those in March did not. Also, 80% of the dairymen recorded the same relative change in mortality rate during each of 2 consecutive winters and 2 consecutive summers. The risk of death for calves was greatest in their 1st week of life on most of the farms; of all deaths in calves less than 5 weeks old, 55% occurred during the 1st week of life, and 27% occurred during the 2nd. In general, the death loss in calves between 5 weeks and 3 months old was less than 2%.
Authors:
S W Martin; C W Schwabe; C E Franti
Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  American journal of veterinary research     Volume:  36     ISSN:  0002-9645     ISO Abbreviation:  Am. J. Vet. Res.     Publication Date:  1975 Aug 
Date Detail:
Created Date:  1975-11-08     Completed Date:  1975-11-08     Revised Date:  2003-11-14    
Medline Journal Info:
Nlm Unique ID:  0375011     Medline TA:  Am J Vet Res     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  1099-104     Citation Subset:  IM    
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MeSH Terms
Descriptor/Qualifier:
Animals
Animals, Newborn
California
Cattle
Cattle Diseases / mortality*
Female
Pregnancy
Seasons
Time Factors

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


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