an ordered factor indicating the mare on which the
measurement is made.
Time
time in the estrus cycle. The data were recorded daily from 3
days before ovulation until 3 days after the next ovulation. The
measurement times for each mare are scaled so that the ovulations for
each mare occur at times 0 and 1.
follicles
the number of ovarian follicles greater than 10 mm in diameter.
Details
Pierson and Ginther (1987) report on a study of the number of large
ovarian follicles detected in different mares at several times in
their estrus cycles.