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  • Title: The induction of parturition in the bitch using sodium cloprostenol.
    Author: Meier S, Wright PJ.
    Journal: Theriogenology; 2000 Aug; 54(3):457-65. PubMed ID: 11051328.
    Abstract:
    The objectives of this studies were to determine a continuous low-dose treatment regimen for the administration of sodium cloprostenol to the bitch that did not cause polydipsia, and whether this treatment would induce normal and timed parturition in bitches during late pregnancy. Non-pregnant greyhound bitches (n=18) received sodium cloprostenol subcutaneously, via a miniosmotic pump, at dose rates of 0.875 to 4.5 microg/kg/24 h, for 7 days (Days 0 to 7). Daily water intake was measured from Day -2 to Day 9. Polydipsia was observed in bitches treated with the higher dose rates but not in bitches treated with the lowest dose rate of 0.875 microg/kg/24 h. In the second experiment, pregnant greyhound bitches received sodium cloprostenol at dose rates of 1 (n=4), 2 (n=1) and 3 microg/kg/24 h (n=1), on Day 57 of pregnancy. Polydipsia was observed in bitches treated at the higher dose rates of 2 and 3 microg/kg/24 h, but not in the bitches treated at the lower dose rate of 1 microg/kg/24 h. These treatments resulted in the successful induction of parturition. Parturition was associated with a decrease in plasma progesterone concentrations, a reduction in body temperature, and an increase in plasma concentrations of 13,14-dihydro-15-keto prostaglandin F2alpha. The first puppy was born 37.7 +/- 2.9 h after the start of treatment (range 28 to 46 h). The duration of whelping was approximately 15.7 +/- 2.2 h (range 10 to 24 h). The litter size was 9.2 +/- 0.8 pups (range 6 to 12 pups), and the puppy survival rate was 6.0 +/- 0.8 per litter (range 4 to 9 pups). This study demonstrated that the administration of sodium cloprostenol in continuous low dose for 24 h is an effective treatment for the induction of parturition in bitches during late pregnancy. This treatment resulted in the birth of healthy pups, with minimal or no side effects to the bitch.
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