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15 resultados
Effect of progesterone, mifepristone, and estrogen treatment during early pregnancy on conceptus development and uterine capacity in Swine.
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A series of experiments was performed to investigate the influence of progesterone at Days 2 and 3 of pregnancy on conceptus development and uterine capacity. In experiment 1, unilaterally hysterectomized-ovariectomized (UHO) white crossbred gilts were given no treatment, estradiol valerate (5 mg
Short-term effects of exogenous estradiol-17 beta on blastocyst development during the period of elongation in swine.
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Objectives were to examine the effects of a single dose (4 mg) of estradiol-17 beta (E2) on blastocyst development around the period of elongation. Proestrus gilts were induced to ovulate with 750 IU of hCG and were mated before ovulation (normal mating, 24 to 32 h post-hCG) or after ovulation had
Steroid regulation of the synthesis and secretion of retinol-binding protein by the uterus of the pig.
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The endometrium of the pig secretes retinol-binding protein (RBP) under the influence of progesterone (P4). The objective of this study was to determine how conceptus-derived estrogen might modulate this production of RBP around days 11-13 of pregnancy when conceptuses elongate from spheres to long
Appearance of beta-hexosaminidase and other lysosomal-like enzymes in the uterine lumen of gilts, ewes and mares in response to progesterone and oestrogens.
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In one experiment, ovariectomized gilts were treated with corn oil (vehicle), progesterone, oestradiol-17 beta or both steroids. While oestradiol treatment did not stimulate enzyme activity in uterine flushings relative to vehicle-treated animals, gilts treated with progesterone had elevated amounts
Endometrial and conceptus response to exogenous progesterone treatment in early pregnant gilts following hormonally-induced estrus.
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The aim of the study was to determine how supplementation with exogenous progesterone (P4) affects the expression of genes important for endometrial receptivity and conceptus development during the peri-implantation period in pigs. Gilts with PMSG/hCG-induced first estrus received daily injections
Immunosuppressive activity of uterine luminal protein from steroid-treated ovariectomized heifers.
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Uterine luminal protein (ULP) collected from ovariectomized steroid-treated crossbred heifers was tested for immunosuppressive activity in vitro. Heifers were allotted to treatment groups and for 16 d received daily injections of the following steroids or vehicle: Control (C, corn oil only, n=10);
Uterine response to progesterone in prepubertal gilts.
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During early pregnancy, progesterone stimulates the secretion of proteins and other molecules that support the developing conceptus. Some gilts are able to support conceptus development as early as 110 days of age. The objective of this study was to evaluate the onset of responsiveness of the
Evidence for steroid control of a putative angiogenic factor in the porcine uterus.
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The formation of new capillaries, both in extraembryonic membranes and in the maternal endometrium, is an essential prerequisite for appropriate feto-maternal relationships throughout pregnancy. At present there is no indication of the nature of the uterine angiogenic stimulus. In-vitro, degradation
Effects of ovarian hormones on manifestation of purulent endometritis in rat uteruses infected with Escherichia coli.
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To assess the influence of hormones on uterine infections, Escherichia coli was infused into uterine lumens of ovariectomized or adrenoovariectomized rats receiving exogenous administration of various doses of ovarian hormones. Large numbers of E. coli were recovered from the rat uterine lumens,
Beta-endorphin in uterine secretions of pseudopregnant and ovariectomized, ovarian steroid-treated gilts.
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Levels of beta-endorphin-like immunoreactivity (beta END-LI) in uterine secretions were studied in pseudopregnant and ovariectomized gilts treated with ovarian steroids. Pseudopregnancy was induced in 7 gilts by daily injection of estradiol valerate (5 mg/day) between days 11 and 15 of the estrous
Changes in k, rb, and na transport to shoots after anoxia.
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The effect of anoxia on subsequent uptake and transport of K, Rb, and Na was examined with seedlings of barley (Hordeum vulgare L.), corn (Zea mays L.), and tall fescue (Lolium x Festuca hybrid derivative) to further our understanding of xylem loading. Roots were incubated in solutions depleted of
Select nutrients and their associated transporters are increased in the ovine uterus following early progesterone administration.
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The intrauterine milieu is a complex mixture of substances originating from serum and endometrium that support blastocyst growth and development. The present study identified alterations in glucose and amino acids in response to an early rise in progesterone (P4), which accelerates blastocyst growth
Conceptus, progesterone, and breed effects on uterine protein secretion in swine.
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This experiment consisted of the following treatment-breed groups: 1) White crossbred gilts, 2) White crossbred gilts treated with progesterone (200 mg/d in corn oil given on d 2 and 3 after estrus), and 3) Chinese Meishan gilts. Pregnant and nonpregnant gilts (n=3 to 6) from each treatment-breed
Endometrial caspase 1 and interleukin-18 expression during the estrous cycle and peri-implantation period of porcine pregnancy and response to early exogenous estrogen administration.
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BACKGROUND
The role for endometrial secretion of cytokines during the establishment of pregnancy in a number of mammals is well established. The current study determined endometrial expression of caspase 1 (CASP1) and interleukin-18 (IL18) during the estrous cycle and early pregnancy, and following
Progesterone regulation of preimplantation conceptus growth and galectin 15 (LGALS15) in the ovine uterus.
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Peri-implantation conceptus (embryo/fetus and associated extraembryonic membranes) growth and development are primarily regulated by secretions from the uterus. This study investigated the effects of progesterone on preimplantation conceptus development and endometrial galectin 15 (LGALS15). Ewes
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