1 HFA-134a was administered to AHA rats by snout-only inhalation for 1 h daily to assess the effects of treatment on reproduction and development. 2 In a fertility study, rats were exposed to atmospheres of 2500, 10000 or 50000 p.p.m. HFA-134a throughout gametogenesis, mating, pregnancy and lactation. 3 In a peri- and post-natal study, rats were exposed to HFA-134a from days 17 to 20 of pregnancy and days 1 to 21 post partum to atmospheres of 1800, 9900 or 64 400 p.p.m. 4 The only treatment-related effect was a slight reduc tion in body weight gain of males of the treated parental generation at 50 000 p.p.m. (fertility study). 5 In neither study were there any adverse effects of HFA- 134a on the reproductive performance of treated animals or on the development, maturation or reproductive performance of up to two successive generations.

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