MATURITY INDEX GROWTH CHANNELS 
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AGE IN DAYS 
Figure 1 35. — Maturity Index Growth channels for females. See figure 134 for additional details. 
Table 59 . — Average maturity indices for litters born during 1948 
Time of birth 
Place of birth 
SAB 
NAB 
Area I 
Area II 
Area III 
Area IV 
Mar. 7 
Mar. 16-27 
Apr. 8-30 
L-7:I.26 
L-10:I.77 
L-15:I.78 
L-l 7, 19:1.71, 
L-22a:I.62 
L-25b:II.35 
L-32:II.60 
L-l 1:1.43 
L-14:I.51 
L-25a:I.75 
L-27a:I.72, L- 
28, 29:11.83 
L-9:I.29 
L-8:I.52 
L— 1 3:11.39 
L-18.I.93 
L— 23b : II. 1 2 
L— 33:11.37 
May 16 to June 1 . . . . 
July 1-20 
August-October 
L-l 6: 1.86 
L-22b:II.18, 
L-23c:I.73 
L-30:I.92 
ters 25b, 32, 22b, 23c, 27a, 28-29, and 33). A 
representative, rather than a mean Maturity In- 
dex was derived, in order that each period of time 
might 1*- represented equally by each locality of 
birth. This representative Maturity Index was 
the mean of the means for each locality for the 
time period in question. Results are shown in 
table 60. These data show clearly that rats born 
later in the breeding season were more likely to 
exhibit inhibited growth. 
222 
