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Milk yield variation concurrent with conception.

E D Harwood1, E L Jensen, D A Wieckert

  • 1Department of Dairy Science, University of Wisconsin, Madison 53706.

Journal of Dairy Science
|July 1, 1991
PubMed
Summary
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Detecting conception in dairy cows using milk yield data is unreliable. Fluctuations in milk production before calving showed low predictive ability for accurately identifying conception events in the study.

Area of Science:

  • Dairy Science
  • Animal Reproduction
  • Agricultural Technology

Background:

  • Conception in dairy cows is crucial for herd productivity.
  • Monitoring reproductive status efficiently is essential for dairy farm management.
  • Milk yield is a readily available metric that could potentially indicate reproductive events.

Purpose of the Study:

  • To investigate the relationship between milk yield fluctuations and conception in dairy cows.
  • To evaluate the predictive ability of milk yield patterns for identifying conception.
  • To assess the utility of diurnal milk yield adjustments and pattern matching for conception detection.

Main Methods:

  • Analysis of milk yield data from 118 Illinois and 244 Wisconsin cows for 15 days preceding confirmed conception.

Related Experiment Videos

  • Application of diurnal adjustments to milk yields to account for a.m. and p.m. milking differences.
  • Utilized pattern matching formulas and discriminant analysis on adjusted milk yields to identify conception events.

    • Main Results:

    • A mean calculated value near conception differed significantly from preceding milk yields in Wisconsin data only.
    • Discriminant analysis could not differentiate between milk yield sequences before and during conception.
    • Pattern matching formulas identified less than 2% of conceptions when set to minimize false positives.

    Conclusions:

    • Concurrent milk yield fluctuations have low predictive ability for conception detection in dairy cows.
    • Despite some statistically significant mean differences, milk yield patterns are not a reliable indicator for identifying conception.
    • Further research may be needed to explore other physiological markers or refine milk yield analysis for reproductive monitoring.