Effect of restricted feeding during the rearing period and a "forced moult" at 40 weeks of production on the productivity of Pekin breeder ducks

canard ducks eclosabilidad del huevo egg hatchability egg production eggs feed intake females femelle fertilidad fertilite fertility hembra huevos moulting muda mue oeuf pato peso poids prise alimentaire (animaux) production d'oeufs productividad productivity reproduction restricted feeding weight