Apparatus and method for detection of estrus and/or non-pregnancy

The present invention is directed to devices for detection estrus-state and/or non-pregnancy in mammals and methods for using the same. The device and/or methods may be of particular use in cattle. The devices disclosed include at least a housing of a size, shape, and outer surface quality permitting it to be securely maintained within a mammals vagina. The housing has at least one interior space for installation of instrument(s) for measuring, intra-vaginally, at least on indicia of estrus (heat) or non-pregnancy, converting the resulting measurement into a signal or signals (electronic or otherwise). The device also comprises a signal transmitting means and, optionally, a remote receiving station capable of interpreting the signal(s).