Elsevier

Theriogenology

Volume 43, Issue 6, 15 April 1995, Pages 989-1000
Theriogenology

The frequency of endemic fetal loss in dairy cattle: A review

https://doi.org/10.1016/0093-691X(95)00063-EGet rights and content

Abstract

Estimates of the frequency of endemic fetal loss range from 0.4 to 10.6%, a 26-fold difference, in 26 studies of dairy herds over 5 decades. Sources of this difference include breed, geographic, study population, case definition and procedural differences. The definition of fetal loss was inconsistent among the studies and was often not clearly stated. Twelve of the studies cited only visually observed losses, while the remainder reported losses of all known pregnancies but using different gestational at-risk periods. Definitions of the resulting frequency measure and methods of computation varied widely among the studies. Fetal loss frequencies have been reported as ratios, proportions, incidence rates and cumulative incidence rates. Denominators used in frequency calculations have included the number of pregnant cows, number of cows in the breeding herd, number of cows that calved before or after the risk period and number of calves born. These procedural differences make comparisons among studies and an overall estimate of an expected frequency of endemic fetal loss in dairy cattle difficult at best. Procedural and definition differences aside, the median frequency of fetal loss from studies enumerating only observed abortions was 1.95% and from the studies that included both observed and unobserved abortions 6.5%. Based on this difference, approximately only 30% of endemic fetal losses are observed visually.

References (42)

  • DJ Klingborg

    Normal reproductive parameters in large “California-style” dairies

    Vet Clin NA: Food Anim Practice

    (1987)
  • LG Paisley et al.

    A survey of the incidence of prenatal mortality in cattle following pregnancy diagnosis by rectal palpation

    Theriogenology

    (1978)
  • TJ Reimers et al.

    Management factors affecting reproductive performance of dairy cows in the northeastern United States

    J Dairy Sci

    (1985)
  • B Abbitt et al.

    Effect of three methods of palpation for pregnancy diagnosis per rectum on embryonic and fetal attrition in cows

    JAVMA

    (1978)
  • N Ayalon

    A review of embryonic mortality in cattle

    J Reprod Fert

    (1978)
  • RK Braun

    Analysis of reproductive records using DHIA summaries and other monitors in large dairy herds

  • CJ Callahan

    Clinical observations on normal and abnormal reproduction in the dairy cow

    Southwest Vet

    (1969)
  • Center for Disease Control

    Guidelines for investigating clusters of health events

    MMWR

    (1990)
  • I Dorland et al.

    Dorland's Illustrated Medical Dictionary

  • WG Etherington et al.

    Dairy herd reproductive health management: evaluating dairy herd reproductive performance-Part I

    Compend Contin Educ Pract Vet

    (1991)
  • RH Foote

    Reproductive performance and problems in New York dairy herds

    Search Agri

    (1978)
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    Current address: Bovine Herd Health of Yakima Valley, P.O. Box 540, Sunnyside, WA 98944.

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