| Popis: |
BASED on the results of two recent State surveys, on the economics of the turkey industry, it becomes apparent that one of the outstanding needs of the industry is an improvement in hatchability. In Washington in 1942, Berryman and Buchanan (1944) have shown that an average of 53.4 salable poults were secured per 100 hatching egg set. In New York in 1943, Misner (1945) has shown that an average of 52.3 salable poults were secured per 100 hatching eggs set. Hatching results, or poults hatched per 100 eggs set, are determined by the percentage of fertile eggs produced and by the percentage of fertile eggs that hatch. The percentage of fertile eggs produced is influenced by flock management practices such as whether or not toms are rotated, whether or not artificial lighting is used and by the incidence of preferential matings and the relative difference between the size of the . . . |
