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• W2152783755 abstract "Sixty primiparous beef heifers from a crossbreeding study were used to examine the effects of inducing parturition with relaxin (3,000 U/mg) combined with cloprostenol (500 μg, i.m., n = 30) or dexamethasone (20 mg, i.m., n = 30) at Day 273, 10 ± 1 days before expected parturition (Day 283). Heifers were assigned at random within cloprostenol and dexamethasone groups to receive relaxin (1 mg, n = 5/treatment), i.m. or in the cervical os (OS), at 0 h (the same time as cloprostenol and dexamethasone) or 24 h later. Eleven and six first-calving heifers and sixteen and nine second-calving cows also received cloprostenol + relaxin and cloprostenol + phosphate-buffered saline, respectively. Radioimmunoassay of daily plasma samples indicated an abrupt decrease in progesterone with time (p < 0.001), from 7.5 ± 0.50 to 1.0 ± 0.30 ng/ml (mean ± SE) within 48 h for all groups. The mean rate of progesterone decrease (ng/ml in 24 h) was accelerated (p < 0.01) in relaxin-treated heifers (5.3 ± 0.36), in contrast to dexamethasone- and cloprostenol-treated control heifers (2.8 ± 0.40). Relaxin combined with cloprostenol or dexamethasone shortened the calving period in these heifers by reducing the interval between treatment and calving (33 vs. 56 h; p < 0.01). The incidence and duration of retained placenta were reduced by 22 vs. 75% and 14 vs. 34 h for relaxin combined with cloprostenol or dexamethasone as compared with cloprostenol- or dexamethasone-treated controls, respectively (p < 0.01). The incidence and duration of retained placenta were unrelated to progesterone concentrations 24 h before (r=0.29) and after (r=0.38) parturition. The induction interval was significantly affected by route or time of administration. In heifers given cloprostenol, cervical OS/0-h administration of relaxin was more effective (p < 0.05) than i.m./24-h administration of relaxin in reducing the incidence of retained fetal membranes. Duration of retention of fetal membranes was reduced by the 0-h/OS treatment, whereas the 24-h/i.m. relaxin treatment was more effective (p < 0.05) at inducing parturition. Rela.xin administration decreased (p < 0.05) the duration of labor. The parity of the heifer did not (p > 0.05) affect the induction interval, or the incidence and duration of retained placenta. We conclude that relaxin combined with cloprostenol or dexamethasone reduces the incidence of retained placenta, as well as shortens the period of calving in beef heifers. The incidence of retained fetal membranes is unrelated to the periparturient progesterone blood concentration, which decreases precipitously after these treatments. We suggest that rela.xin facilitates placental expulsion by modifying connective tissue in the placentomes during late pregnancy in cattle." @default.
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• W2152783755 date "1987-11-01" @default.
• W2152783755 modified "2023-09-24" @default.
• W2152783755 title "Induction of Parturition, Progesterone Secretion, and Delivery of Placenta in Beef Heifers Given Relaxin with Cloprostenol or Dexamethasone1" @default.
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• W2152783755 doi "https://doi.org/10.1095/biolreprod37.4.797" @default.
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