China Animal Husbandry and Veterinary Medicine ›› 2022, Vol. 49 ›› Issue (2): 539-547.doi: 10.16431/j.cnki.1671-7236.2022.02.015

• Nutrition and Feed • Previous Articles     Next Articles

Effects of Dietary Metabolizable Energy Levels on Growth Performance, Carcass Traits and Serum Biochemical Indices of Ningdu Yellow Chickens

SONG Qiongli, SONG Wenjing, CHEN Xiaolian, WEI Qipeng, XIE Jinfang, ZOU Zhiheng, LIU Linxiu, XIONG Pingwen   

  1. Institute of Animal Husbandry and Veterinary Science, Jiangxi Academy of Agricultural Sciences, Nanchang 330200, China
  • Received:2021-08-09 Published:2022-01-27

Abstract: 【Objective】 This experiment was conducted to study the dietary metabolizable energy(ME) requirements for Ningdu Yellow chickens at different growth stages.【Method】 A single factor complete randomized trial design was adopted.600, 480 and 360 Ningdu Yellow chickens with similar body weight at the age of 1, 29 and 57 days were selected and randomly divided into four treatments with 6 replicates and 25, 20 and 15 chickens per replicateat at three stages, respectively.Dietary ME was set at four levels (Low, lower, medium and high).From 1 to 28 d, the ME levels were 11.50, 11.95, 12.40 and 12.85 MJ/kg, respectively, from 29 to 56 d, the ME levels were 11.68, 12.14, 12.60 and 13.06 MJ/kg, respectively, from 57 to 105 d, the ME levels were 11.60, 12.20, 12.80 and 13.40 MJ/kg, respectively.The effects of dietary metabolizable energy level on growth performance, serum biochemical indices and carcass traits were investigated.【Result】 ① At 1 to 28 days of age, feed to gain ratio (F/G) in high ME group was significantly lower than other groups (P < 0.05).②At 29 to 56 days of age, average daily feed intake (ADFI)and F/G in medium and high ME groups were significantly lower than low and lower ME groups (P < 0.05), F/G in lower ME group was significantly lower than low ME group (P < 0.05).Serum total protein (TP) in high and medium ME groups were significantly higher than those in low group (P < 0.05), albumin (ALB) in medium ME group was significantly higher than those in lower and low groups (P < 0.05).③At 57 to 105 days of age, with the ME levels increasing, final weight and average daily gain (ADG) showed an increasing trend (0.05 < P < 0.1).ADFI in medium and high ME groups were significantly lower than low and lower ME groups (P < 0.05), F/G in high ME group was significantly lower than other groups (P < 0.05), F/G in low and medium ME groups were significantly lower than that in low ME group (P < 0.05).Serum triglyceride (TG) level was increased with dietary ME levels increasing (0.05 < P < 0.1).Abdominal fat percentage at 105 days of age was increased with dietary ME levels increasing (0.05 < P < 0.1).【Conclusion】 Based on the results of this experiment, high ME level was recommended for Ningdu Yellow chickens at 1 to 28 and 29 to 56 days of age, medium ME level was recommended for Ningdu Yellow chickens at 57 to 105 days of age.

Key words: Ningdu Yellow chicken; metabolizable energy; growth performance; carcass trait; serum biochemical index

CLC Number: