[On the improvement of the duck variety]
1990
Ju Lak, L. | Sok Chan, J. (Academy of Agricultural Science, Pyongyang (Korea Democratic People's Republic). Poultry Inst.)
"Hyongsan duck" is an improved female breed from "Dudan duck". The number of laying eggs/year is 250 pcs, body weight at 45 days 2657 g, and body weight at 49 days 2936 g. "Jasan duck" is an improved variety by the method of complex line. It grows rapidly and the rate of reproduction is high. Laying eggs at 40 days is 226 (275 pcs a year), body weight at 45 days 3051 g, 3426 g at 49 days, and 3843 g at 60 days
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