( ( ( Another definition ) ( of ( the ( estrous cycle ) ) ) ) ( ( ( is ( ( the period ) ( from ( ( one ovulation ) ( to ( the ( following ovulation ) ) ) ) ) ) ) ( when ( accompanied ( by ( signs ( of estrus ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (DT Another) (NN definition)) (PP (IN of) (NP (DT the) (JJ estrous) (NN cycle)))) (VP (VBZ is) (NP (NP (DT the) (NN period)) (PP (IN from) (NP (NP (CD one) (NN ovulation)) (PP (TO to) (NP (DT the) (JJ following) (NN ovulation)))))) (SBAR (WHADVP (WRB when)) (S (VP (VBN accompanied) (PP (IN by) (NP (NP (NNS signs)) (PP (IN of) (NP (NNS estrus))))))))) (. .)))
Another definition of the estrous cycle is the period from one ovulation to the following ovulation when accompanied by signs of estrus.
(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))))))) (. .)))