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A total of 150 one-day-old male broiler chicks (Ross 308) and 120 one-day-old female Muscovy ducklings were distributed over 15 and 12 pens, respectively. All birds received the same diet during the first period of life. Throughout the second period (36-56 days for broiler chickens and 43-69 days for Muscovy ducks) different source plant extracts were supplemented to the basal diet for each species;...
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