Sadly not all strains of the same breed will lay the text-book number of eggs since there has been a large amount of selection for specific traits desirable in the showing circuit and sometimes egg production has actually been bred out of these strains.
An astronomical unit (AU) is a measure of distance often used in astronomy, equal to the distance between the Earth and the Sun. In terms of more common units of measurement, an AU is equal to about 93 million miles (150 million km), or the distance light travels in a little over eight minutes. The symbol AU is most often used to represent the astronomical unit, though less commonly you may see UA used instead.
One AU is equivalent to a 1000 lb non-lactating cow, and represents the consumption of approximately 25 lb of dry matter per day. The animal unit equivalent (AUE) for sheep is 0.2 or, put more simply, 5 ewes are equivalent to one AU. The AUE for a ewe and her lambs is 0.3. Stocking rate is often listed in animal unit months (AUM), or the amount of forage intake of one AU for 30 days.