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Fig. 2. Lumbar vertebra growth over time. (A) Each dot on the graph represents the
length of the L4 vertebra at the time of radiography. The three breeders
(02-02, 02-04 and 02-05) show increased growth of L4 over time as compared
with nonbreeders and the breeding male. Starred dots indicate the L4
measurement just prior to parturition (parturition <7 days from recorded
radiograph). (B) An expanded view of pregnancy 5 for Breeder 02-04 (enlarged
version of the boxed area in A). Growth occurs throughout the 10-week
pregnancy, ending at parturition (starred dot).