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Related Experiment Videos

Prolonged service intervals in cattle.

K Moller1, K R Lapwood, R M Marchant

  • 1Department of Veterinary Clinical Sciences, Massey University, Palmerston North.

New Zealand Veterinary Journal
|August 1, 1986
PubMed
Summary
This summary is machine-generated.

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Late returns in dairy cows, identified by milk progesterone, reveal significant conceptus loss and reproductive inefficiencies. Early detection and intervention are crucial for reducing wastage in seasonal calving herds.

Area of Science:

  • Veterinary Medicine
  • Reproductive Biology
  • Dairy Science

Background:

  • Late returns to service in dairy cows represent a significant reproductive challenge.
  • Understanding the causes of these late returns is crucial for improving herd fertility.
  • Milk progesterone assays offer a non-invasive method for monitoring reproductive status.

Purpose of the Study:

  • To investigate the causes of late returns to service in dairy cows using milk progesterone analysis.
  • To quantify the incidence of conceptus loss and other reproductive issues contributing to late returns.
  • To assess the prevalence of late returns in New Zealand dairy herds.

Main Methods:

  • Milk samples were collected from 2274 cows across 14 herds on specific days relative to insemination.

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  • Progesterone concentrations were determined using radioimmunoassay (RIA).
  • Late returns were defined as returns to oestrus 36 or more days post-insemination; detailed analysis was performed on these cases.

    • Main Results:

    • Late returns occurred in 8.6% of cows; 55.9% of these were attributed to conceptus loss.
    • Other identified causes included undetected oestrus (22.1%), anoestrus at insemination (11.8%), and early pregnancy (5.6%).
    • The study reported lower prevalence of late returns and conceptus loss compared to previous research.

    Conclusions:

    • Conceptus loss is a major contributor to late returns, significantly impacting herd wastage rates.
    • The findings highlight the need for improved reproductive management strategies in seasonal calving dairy herds.
    • Recommendations for prevention are discussed to mitigate reproductive inefficiencies.