Effect of time of insemination and calf removal after estrus synchronization in beef cattle

Practical estrus synchronization techniques offer several advan- tages to today's producer such as reducing length of the breeding season, reducing labor requirements for heat detection, and possible incorporation into super ovulation and embryo transfer programs.Management techniques such as short term calf removal and breeding by appointment could also be used in conjunction with estrus synchro- nization to improve reproductive efficiency of the beef cow.Synchronizing estrus in the beef cow can be accomplished in three basic ways:(1) preventing heat and ovulation, (2) cessation of the cycle, or (3) using a combination of the two (Heersche et al ., 1979) .Compounds used in these synchronization procedures have been administered via intrauterine infusions, vaginal sponges, orally, intramuscular injections and subcutaneous implants.