( ( ( The ( limited period ) ) ( of ( ( heat ( or ( sexual receptivity ) ) ) ( that ( occurs ( around ( ovulation ( in ( ( female mammals ) ( having ( estrous cycles ) ) ) ) ) ) ) ) ) ) ) . )
(ROOT (NP (NP (DT The) (JJ limited) (NN period)) (PP (IN of) (NP (NP (NN heat) (CC or) (JJ sexual) (NN receptivity)) (SBAR (WHNP (WDT that)) (S (VP (VBZ occurs) (PP (IN around) (NP (NP (NN ovulation)) (PP (IN in) (NP (NP (JJ female) (NNS mammals)) (VP (VBG having) (NP (JJ estrous) (NNS cycles)))))))))))) (. .)))
The limited period of heat or sexual receptivity that occurs around ovulation in female mammals having estrous cycles.
(ROOT (S (NP (NNP Ovulation)) (VP (VBZ occurs) (SBAR (IN before) (S (NP (DT the) (NN endometrium)) (VP (VBZ thickens) (PP (IN in) (NP (JJ estrous) (NNS cycles))))))) (. .)))