The particular heat cycle will usually last about 2-3 weeks. Sometimes, a younger dog may have an irregular cycle that takes about 18 to 24 months to develop into a regular one.

Estrous cycle-dependent modulation of sexual receptivity in female mice by estrogen receptor beta-expressing cells in the dorsal raphe nucleus. The Journal of Neuroscience, ...

Researchers have found that the brain networks that mediate stress relief after eating highly palatable foods may vary between males and females, and may also depend on the stage of the estrous cycle.

As shown in Figure 3c, a greater proportion of DCs from female mice at stages of the estrous cycle associated with higher progesterone levels (metaestrus, diestrus) expressed PR, whereas a smaller ...