饲粮不同代谢能和粗蛋白质水平对11～21周龄吉山黑鸡生长和屠宰性能、血清生化指标的影响

doi:10.16431/j.cnki.1671-7236.2025.11.013

Abstract

Abstract: 【Objective】 This experiment was conducted to explore the appropriate dietary metabolic energy (ME) and crude protein (CP) requirements for 11-21 weeks of age Jishan Black chickens. 【Method】 A total of 576 Jishan Black line Ⅰ roosters aged at 11 weeks with normal feeding and similar body weight were randomly divided into 6 groups with 6 replicates per group and 16 chickens per replicate.A 2×3 factorial design with two levels of ME (11.09 and 11.51 MJ/kg) and three levels of CP (14%,15% and 16%) was used in this experiment to prepare 6 experimental diets.The pre-trial period was 1 week,and the trial period was 10 weeks.During the experiment,the average daily feed intake (ADFI),average daily gain (ADG),and feed to gain ratio (F/G) were calculated.On the end of the 10th week of the experiment,4 chickens were taken from each replicate to measure the body length,chest width,chest depth,keel length,shank length and shank girth,and 2 chickens in each replicate were selected for blood collection and slaughter to determine the slaughter performance and serum biochemical indicators. 【Result】 The growth performance,body size traits and slaughter performance of chickens were not significantly affected by dietary ME and CP levels (P＞0.05).When the dietary ME level was 11.51 MJ/kg,the contents of total protein (TP),albumin (ALB),total cholesterol (T-CHO),triglycerides (TG),high-density lipoprotein cholesterol (HDL-C) and low-density lipoprotein cholesterol (LDL-C) in serum were significantly higher than those in the group with dietary ME level was 11.09 MJ/kg (P＜0.05).The serum biochemical indicators were not significantly affected by dietary CP levels (P＞0.05),and dietary ME and CP levels had the significant interaction on contents of uric acid (UA),T-CHO and LDL-C in serum (P＜0.05). 【Conclusion】 Considering all indices comprehensively,it was recommended that the optimal dietary ME and CP levels for Jishan Black line Ⅰ roosters aged 11 to 21 weeks were no higher than 11.09 MJ/kg and 14.00%，respectively.

Key words: metabolic energy; crude protein; Jishan Black chickens; growth performance

CLC Number:

S815.1

XIE Qingzhu, DU Yuanjun, LIU Zengmin, LIU Xiaohui, LIAO Yuxue, XIA Guangliang, SHEN Yingchao, LIU Wei. Effects of Diets with Different Levels of Metabolic Energy and Crude Protein on Growth, Slaughter Performance and Serum Biochemical Indicators of Jishan Black Chickens Aged 11 to 21 Weeks[J]. China Animal Husbandry & Veterinary Medicine, 2025, 52(11): 5157-5167.

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Effects of Diets with Different Levels of Metabolic Energy and Crude Protein on Growth, Slaughter Performance and Serum Biochemical Indicators of Jishan Black Chickens Aged 11 to 21 Weeks

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