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Animal trial reveals increased litter size in early-gestation sows, indicating that combined progesterone and oestrone improve embryonic survival during implantation.
Progesterone and oestrone alone or in combination were administered to sows during early gestation. A dose of 25 mg progesterone and 12-5 mug oestrone injected together for 10,5 or 2 consecutive days during the implantation interval caused increased litter size at term.
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Wildt et al. (1976) studied this question.
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