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33 Poltava Clay (PC) and White Leghorn (WL) cocks were reared as follows: (1) on deep litter from hatching to 140 days of age; (2) in cages from hatching to 60 days and on deep litter from 61 to 140 days; (3) in cages from hatching to 140 days. From 140 days, the cocks were housed in cages, 3 or 5...

Byelov, L. M.; Revenko, V. I.
Ptakhivnitstvo, 1978, No. 25, pp 12-15