Profitability for cattlemen can be increased by using sires that are genetically superior for growth rate, carcass quality and efficiency. Artificial insemination (AI) allows the introduction of new and superior genetics compared with the use of natural service. Utilization of AI requires detection of the optimal time to inseminate cows to initiate an acceptable pregnancy rate. Estrous behavior of cows (standing to be mounted by other animals) is the best visual signal to determine when cows should be inseminated to achieve maximum pregnancy rates. Failure to accurately detect estrus in beef and dairy cows is costly to the livestock industry.
A common practice to detect estrus is to observe cows twice daily for 30 minutes. However, since some animals are in estrus less than 12 hours, all animals are not detected (White et al, 2002, J. Anim. Science 80:3053). Radiotelemetry offers a system by which estrous behavior can be monitored 24 hours a day. A system using radiotelemetry is available for estrous detection of cows, however the system is expensive. The BullsEye system will be more economical and could be used by producers with less capital investment to increase the use of AI and pregnancy rates.
Robert P. Wettemann
Regents Professor
Department of Animal Science
Oklahoma State University
