China Animal Husbandry and Veterinary Medicine ›› 2022, Vol. 49 ›› Issue (2): 501-509.doi: 10.16431/j.cnki.1671-7236.2022.02.011

• Nutrition and Feed • Previous Articles     Next Articles

Study on Dietary Crude Protein Requirement of Silky Fowl During 1 to 25 Days of Age

FAN Qiuli1, JIANG Shouqun1, WANG Hanhua2, RUAN Dong1, CHENG Zhonggang1   

  1. 1. Guangdong Key Laboratory of Animal Breeding and Nutrition, Key Laboratory of Animal Nutrition and Feed Science in South China, Ministry of Agriculture and Rural Affairs, State Key Laboratory of Livestock and Poultry Breeding, Institute of Animal Science, Guangdong Academy of Agricultural Science, Guangzhou 510640, China;
    2. Guangdong Wens Foodstuff Group Co., Ltd., Yunfu 527400, China
  • Received:2021-09-23 Published:2022-01-27

Abstract: 【Obiective】 The aim of this experiment was to investigate the effects of dietary crude protein level on growth performance, carcass traits and serum biochemical indices of male Silky fowl during 1 to 25 days of age, to investigate the crude protein requirment of Silky fowl at this stage.【Method】 1 625 1-day-old male Silky fowl were randomly assigned to 5 groups with 5 replicates per group and 65 chickens per replicate, crude protein levels in five groups were 18.5%, 19.5%, 20.5%, 21.5% and 22.5% respectively, and the experiment lasted for 25 days.At the end of this experiment, two chickens with body weight close to the average were selected from each replicate for slaughter, blood was collected for serum preparation and carcasses were separated, carcass traits and serum biochemical indexes were determined.【Result】 ①Dietary crude protein level significantly affected F/G (P < 0.05), with the increasing of crude protein level, F/G was decreased linearly and quadratically (P < 0.05).Crude protein level had no significant effects on final body weight, average daily gain (ADG), average daily feed intake (ADFI) and survival rate (P > 0.05).②Crude protein level had no significant effects on carcass weight, half-eviscerated weight, eviscerated weight, breast muscle rate, leg muscle rate and abdominal fat rate (P > 0.05).③Crude protein level significantly affected the serum contents of BUN and IGF-1 (P < 0.05), and with the increasing of crude protein level, both contents of BUN and IGF-1 were increased linearly and quadratically (P < 0.05).【Conclusion】 In conclusion, dietary 21.5% to 22.5% crude protein could improve growth performance and 18.5% to 21.5% crude protein could regulate nitrogen metabolism.Using the F/G, BUN and IGF-1 contents as evaluation criteria, according to the quadratic curve model, the optimal dietary crude protein levels of Silky fowl aged from 1 to 25 days were 23.18%, 19.20% and 22.62% respectively.

Key words: Silky fowl; crude protein; optimum demand; growth performance; carcass traits; serum biochemical indices

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