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GENETIC AND UTERINE EFFECTS ON SURVIVAL IN MICE SELECTED FOR BODY WEIGHT

Summary.: Intra- and inter-line transfers of blastocysts were performed between two lines of mice selected for high (H₆) and low (L₆) body weight at 6 weeks of age. A greater percentage of L₆ blastocysts survived to term than did H₆ blastocysts (7·8%, P < 0·01) and more L₆ recipients littered than did the H₆ recipients (19·7%, P < 0·01). A greater percentage of the mice born to the L₆ recipients was found alive at birth (8·5%, P < 0·05), as was a greater percentage of the young carried in the uteri of the opposite line (8·3%, P < 0·05).