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table I, 3 are einiated to have been born in December ee one in Apri. 
It was not possible to estimate the birth dates of the 5 other animals. 
The captive female at the Cleveland Zoological Park was believed: 
to have first come in heat at the age of 20 months. The first period noted: 
occurred December 13—14, 1959. Succeeding periods were noted January 6, 
January 30, and February 21, 1960. The next observed period. started 
on August 13, 1960, followed by others on September 7, September 29, 
October 30, December 17, 1960, and January 10, 1961. During the. in- 
tervals February 21 to August 13 and October 30 to December 17, 1960, 
other periods may have occurred, but were not abserved. The recorded 
intervals, excluding the interval from February to August and in. No- 
vember, from onset. to onset are, in sequence: 25 days, 24 days, 22 days, 
26 days, 22 days, 31 days, 18 days and 25 days. This interval approximates 
that of domestic cattle which is about 21 days (Aspect, 1946) and that 
of the common eland of 3 weeks (HEapg, 1901). These periods were indi- 
cated by increased physical activity or friskiness by the fenvale, a more 
frequent recognition of the keeper by a bleating call, and loose stools. 
A very slight swelling of the vulva was believed detected coincident with 
