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Reproductive performance with an automated activity monitoring system versus a synchronized breeding program
R C Neves1, K E Leslie, J S Walton
1Department of Population Medicine, University of Guelph, Ontario, Canada N1G 2W1.
Journal of Dairy Science
|August 21, 2012
Summary
Automated activity monitoring (AAM) and timed artificial insemination (TAI) programs showed similar reproductive performance in Holstein cows overall. However, herd-specific interactions influenced the effectiveness of each breeding management system.
Area of Science:
- Reproductive management in dairy cattle
- Animal breeding and genetics
- Dairy herd management systems
Background:
- Optimizing reproductive performance is crucial for dairy farm profitability.
- Automated activity monitoring (AAM) systems offer potential for improved estrus detection and breeding management.
- Timed artificial insemination (TAI) programs provide a structured approach to breeding dairy cows.
Purpose of the Study:
- To compare the reproductive performance of Holstein cows managed under an AAM system versus a TAI program in commercial field conditions.
- To evaluate the influence of herd-specific factors on the efficacy of different reproductive management strategies.
Main Methods:
- A randomized controlled trial involving 1,429 Holstein cows across 3 commercial herds in Ontario, Canada, over 1 year.
- Cows were assigned to either an AAM system or a TAI program, with a crossover after 6 months.
- Reproductive outcomes, including time to pregnancy, were analyzed using Cox proportional hazards models, accounting for herd and parity.
Main Results:
- Overall, no significant difference in time to pregnancy, time to first service, or time to second service was observed between AAM and TAI groups when visual estrus detection was also used.
- A significant interaction between herd and breeding program was identified, indicating that the relative performance of AAM and TAI varied between farms.
- In specific herds (B and C), cows managed with AAM became pregnant significantly sooner than those in the TAI group, particularly when inseminations were solely based on the assigned program.
Conclusions:
- While AAM and TAI programs demonstrate comparable overall reproductive efficiency in dairy herds when supplemented with visual estrus detection, herd-specific management and cow factors significantly influence outcomes.
- The effectiveness of AAM versus TAI is not uniform across all herds, suggesting a need for tailored reproductive management strategies.
- Further research is required to identify the specific factors contributing to the variability in performance between herds for these reproductive management systems.
