1991
DOI: 10.1095/biolreprod44.3.536
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Relationship between Variation in Conceptus Development and Differences in Estrous Cycle Duration in Ewes1

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Cited by 72 publications
(34 citation statements)
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“…During early luteal phase, inadequate or low progesterone levels generally cause to strike against embryonic development (Nephew et al 1991). For this reason, progesterone from corpus luteum is needed for embryonic implantation and development in uterus (Thatcher et al 2001) or exogenous progesterone applications may be needed to continue these vital processes for embryo (Davies and Beck 1992;Nephew et al 1994;Rostami et al 2017).…”
Section: Introductionmentioning
confidence: 99%
“…During early luteal phase, inadequate or low progesterone levels generally cause to strike against embryonic development (Nephew et al 1991). For this reason, progesterone from corpus luteum is needed for embryonic implantation and development in uterus (Thatcher et al 2001) or exogenous progesterone applications may be needed to continue these vital processes for embryo (Davies and Beck 1992;Nephew et al 1994;Rostami et al 2017).…”
Section: Introductionmentioning
confidence: 99%
“…The postovulatory rise in circulating P4 during early pregnancy clearly affects blastocyst growth in cattle (60). Increasing concentrations of P4 during metestrus and early diestrus enhanced blastocyst development and size by days [13][14][15][16] in heifers and cows (12,23,59), while animals with lower concentrations of P4 in the early luteal phase had retarded embryonic development (61,66) and conceptuses produced less IFNT (61). Studies of both sheep and cattle are beginning to identify pregnancy and P4-responsive genes in the endometrium that potentially regulate blastocyst elongation and implantation of the conceptus (see Refs.…”
mentioning
confidence: 99%
“…In ewes, low blood progesterone concentrations at ovulation increase markedly during the luteal phase (between days 2 and 10 of oestrous cycle), and during the next follicular phase (between days 16 to18 of oestrous cycle) they decrease again (Gonzales Reyna et al 1987;Peeters et al 1989;R h odes et al 1990;G onzales Reyna et al 1991;Nephew et al 1991). Differences in serum progesterone levels between the pregnant and cycling ewes appear between days 14 and 18 after oestrus, i.e.…”
mentioning
confidence: 99%