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A flock of 440 White Leghorns was kept in individual wire cages over a 10-mth. trap nesting period; 219 were inseminated between 12th April and 7th June 1956, and were, on average, 7 days older than the remaining 221 hens which served as controls. Laying rate was calculated for 4 unequal periods, 2 ...

Eefuah Veterinarith, 1957, 14, pp 172-177