. Bulletin. Natural history; Natural history. 44 Illinois Natural History Survey Bulletin Vol. 31, Art. 2 300 < , 4TyX ^ 25 ^^ i _ i ^-^^ 7 . / '^PAROUS S 200 i 100 ^ t' "^NULLIPAROUS MATINC 3 / J/ OW! MATING >XX? jc » SEASON >6<S<® n r AA§$5$«^§§§^X SEPT OCT. NOV. DEC. JAN. FEB. MAR. APR. MAY JUNE JULY AUG. Fig. 5.—Seasonal variations in the overage total weight of both ovaries from parous or preg- nant and nulliporous raccoons. With each mean ore the number of observations and a vertical line representing the mean plus or minus one standard error. All animals were taken i
. Bulletin. Natural history; Natural history. 44 Illinois Natural History Survey Bulletin Vol. 31, Art. 2 300 < , 4TyX ^ 25 ^^ i _ i ^-^^ 7 . / '^PAROUS S 200 i 100 ^ t' "^NULLIPAROUS MATINC 3 / J/ OW! MATING >XX? jc » SEASON >6<S<® n r AA§$5$«^§§§^X SEPT OCT. NOV. DEC. JAN. FEB. MAR. APR. MAY JUNE JULY AUG. Fig. 5.—Seasonal variations in the overage total weight of both ovaries from parous or preg- nant and nulliporous raccoons. With each mean ore the number of observations and a vertical line representing the mean plus or minus one standard error. All animals were taken in Illinois from July 18, 1958 through May 30, 1961. The data ore given in Table S. with the adult group. Hence, nulliparous females probably represented only females that did not reach sexual maturity at approximately 1 year of age. All females less than 1 year of age in the January sample were counted as juveniles, as no pregnant female was found during that month. The seasonal weights of the ovaries in parous raccoons (Table 5) followed a pattern similar to that found for the gonads of adult males (Table 1). The minimum average weight was reached during July, with a slow but consistent increase in weight during August, Sep- tember, and October. The fall peak. 1 23456789 10 NOVEMBER 23456789 10 DECEMBER WEIGHT CLASSES 23456 789 10 JANUARY Fig. 6.—The average total weights of both ovaries from parous or pregnant and nulliparous raccoons. All animals were taken in Illinois from November 1958 through January 1961. The numerals at the tops of the bars indicate the numbers of animals in the parous or pregnant and nulliparous Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Illinois. Natural History Survey Division. Urbana, State of Illinois, Dept. of Registration and Education, Natural History
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