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(A) Feed efficiency (n = M, F WT = 8, 6 +/− = 8, 8 −/− = 9, 5). (B) Serum concentrations (n = 6/group) of growth hormone (GH) and insulin-like growth factor 1 (IGF-1). (A,B) Statistics: N.B. G, genotype; A, age, S, sex, *denotes an interaction. Means with different letters are significantly different, P < 0.05.
