However, if either product is left for more than 15 days or is given in low doses, the estrous cycle is extended for 18-24 days and lower fertility and conception rates result through the disruption of normal follicular patterns. Presently, these implants are unavailable in the United States. They can stimulate estrous cycles in static cows. The risk of pyometra is lower since there is a defined, brief number of days for use and not a lengthy therapy. The ensuing estrus raises circulating concentrations of estrogen which prompts an influx of leukocytes.
Several precautions are noteworthy before trying estrus synchronization.
Thin, sick cows or cows that are less than 4-5 weeks postpartum respond poorly. Cow with poor body condition 2. Cattle should be vaccinated to provide peak immunity and avoid stress-related illness. The AI technician should be prepared to do multiple inseminations in a short time. A veterinarian should palpate the cows ahead of time to categorize them into noncyclic, pregnant, or heifers with a small pelvis.