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Comparison of oestrus detection methods in dairy cattle
A Holman1, J Thompson, J E Routly
1School of Veterinary Science, University of Liverpool, Leahurst, Neston, Cheshire CH64 7TE.
The Veterinary Record
|July 7, 2011
Summary
Detecting estrus in dairy cows is challenging. Combining neck collars and farm staff observation offers the best accuracy, outperforming pedometers and heat mount detectors, especially in cows with low body condition or high milk yield.
Area of Science:
- Reproductive Physiology
- Animal Science
- Dairy Cattle Management
Background:
- Accurate estrus detection is crucial for efficient artificial insemination and reproductive herd management in dairy cows.
- Various technologies exist to aid estrus detection, but their efficacy and limitations require ongoing evaluation under diverse farm conditions.
Purpose of the Study:
- To compare the accuracy of different estrus detection methods in Holstein-Friesian cows.
- To investigate the impact of production stressors on the performance of these detection methods.
- To identify optimal strategies for combining detection methods to improve overall accuracy.
Main Methods:
- Sixty-seven postpartum Holstein-Friesian cows were equipped with pedometers and neck collars.
- Cows were assigned to receive heat mount detectors (scratchcards or KaMaR) or rely solely on farm staff observation.
- Estrus detection accuracy and false-positive rates were assessed, considering factors like body condition score and milk yield.
Main Results:
- Combining all detection methods identified only 74% of potential estrus periods.
- No significant difference in sensitivity for true estrus events was found between pedometers, neck collars, and KaMaRs (approx. 60%), but scratchcards were less effective (36%).
- Pedometers and KaMaRs generated more false-positive detections; neck collars failed to detect estrus in cows with low body condition score (<2).
- High milk yield reduced detection efficiency for neck collars (OR=0.34) and pedometers (OR=0.30).
- Pedometer efficiency was also reduced by lameness (OR=0.42) and low body condition score (OR=0.15).
- Production stressors did not influence false-positive rates.
- Neck collars and farm staff observation showed higher positive predictive values, with their combination yielding the best results.
Conclusions:
- No single estrus detection method is perfectly accurate; combining approaches is necessary for improved detection rates.
- Neck collars and direct farm staff observation are valuable tools, particularly when used together.
- Factors such as low body condition score and high milk yield significantly impair the effectiveness of certain estrus detection technologies.
