Laying patterns of geese in the mid west

In the nine years from 1966 through 1974 two large flocks of geese, one Emden and the other Toulouse, averaging respectively 1959 and 734 females began laying between January 9 and February 28 with the Toulouse lagging an average of 16 days. It took a mean of 17 days to advance from the 5% to the 33-1/3% level of laying. An average rate of 29.5% was thereafter maintained for 80 days, after which it dropped to 16% in ten more days.