( ( Injection ( of ( PGF ( into ( ( cattle ( between ( ( ( Day 5 ) and ) 17 ) ) ) ( of ( their ( estrous cycle ) ) ) ) ) ) ) ) ( ( will ( ( cause ( luteal regression ) ) ( followed ( by ( ( ( ( ( ( spontaneous ( follicular maturation ) ) , ) ovulation ) , ) and ) ( ( estrous behaviour ) ( in ( ( ( two to ) four ) days ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (NNP Injection)) (PP (IN of) (NP (NP (NNP PGF)) (PP (IN into) (NP (NP (NNS cattle)) (PP (IN between) (NP (NNP Day) (CD 5) (CC and) (CD 17))) (PP (IN of) (NP (PRP$ their) (JJ estrous) (NN cycle)))))))) (VP (MD will) (VP (VB cause) (NP (JJ luteal) (NN regression)) (PP (VBN followed) (PP (IN by) (NP (NP (JJ spontaneous) (NN follicular) (NN maturation)) (, ,) (NP (NN ovulation)) (, ,) (CC and) (NP (NP (JJ estrous) (NN behaviour)) (PP (IN in) (NP (QP (CD two) (TO to) (CD four)) (NNS days))))))))) (. .)))
Injection of PGF into cattle between Day 5 and 17 of their estrous cycle will cause luteal regression followed by spontaneous follicular maturation, ovulation, and estrous behaviour in two to four days.
(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))))))) (. .)))