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erature passes 81 degrees.
It is also reported that when temperatures drop to the point that combs and wattles of birds are freezing,, little if any mating takes place. It is highly important, says Burtner, for owners of ! hatchery flocks to avoid extreme variations of temperature in their poultry houses. Storage of eggs and egg size influences hatchability to an appreciable degree. Research at Texas A & M shows that, beginning on the fifth day of storage, there is a gradual decline in the hatchability of eggs. There is no appreciable decline from 1 to 4 days, and then about a 1 percent decline for each day thereafter. As eggs are held for longer periods, this decline in hatchability increases more rapidly. It is important for eggs to be set twice a week to increase the hatch. Work at VPI shows that eggs from 22 ounces to 28 ounces hatch between 86 and 92 percent; 18 ounce and 30 ounce eggs hatch 69 and 78 percent respectively. This information indicates that average sized eggs tend to hatch better than the smaller or larger ones. It has been shown that if eggs stored beyond 4 days are given an increase in incubating time, better hatches can be had from stored eggs.
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