Rabbit Oviduct Isthmus Contraction Patterns in Estrus and after Human Chorionic Gonadotropin and Progesterone Treatment1

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Abstract
A microminiature (1.6 mm x 0.4 mm overall), externally attached force transducer has been developed which permits chronic measurements of oviduct isthmus motility in unrestrained rabbit does. The design makes use of integrated circuit technology to satisfy the stringent requirements of high sensitivity, long term stability, reproducibility, and noninterference with normal oviduct function. These force transducers achieved an average lifetime of over 60 days, based on 58 implants in Phase 1 (40 doubles, 18 triples) and 56 implants in Phase 2 (50 doubles, 6 triples) in 53 New Zealand White rabbits.