Counts of Ovarian Follicles in Mares

SUMMARY:

The Ovary data frame has 308 rows and 3 columns giving the number of ovarian follicles detected in different mares at different times in their estrus cycles.

DATA DESCRIPTION:

This data frame contains the following columns:

VALUE:

Mare
a factor indicating the mare on which the measurement is made.
Time
time in the estrus cycle. The data were recorded daily from three days before ovulation until three 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.

SOURCE:

These data come from the study reported in Pierson and Ginther (1987), "Follicular population dynamics during the estrus cycle of the mare", Animal Reproduction Science, 14, 219-231.

SEE ALSO:

, , .

EXAMPLES:

Ovary.lis <- lmList(follicles ~ sin(2 * pi * Time) + 
                    cos(2 * pi * Time), 
                    data = Ovary, cluster = ~ Mare) 
Ovary.lme <- lme(Ovary.lis)