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Outline
The purpose of this experiment is to investigate the metabolic energy requirements of 1-21-day-old rapid yellow feathered broiler chickens. A total of 900 healthy 1-day-old Xiangjia Yellow Chicken chicks （450 male and 450 female chicks） with similar body weights were randomly allocated into 5 groups for each gender， each consisting of 6 replicates with 15 birds per replicate. A single-factor completely randomized design was employed to feed different levels of metabolic energy diets over an experimental period of 21 days（Male：11.51、11.92、12.34、12.76、13.18 MJ·kg-1；Female：11.30、11.72、12.13、12.55、12.97 MJ·kg-1）. The results demonstrated that： 1） Growth performance analysis revealed quadratic patterns （P<0.01） in body weight （BW） and average daily gain （ADG） of male chicks with increasing dietary metabolizable energy （ME） levels during 1-21 days， while females exhibited significant positive linear relationships （P<0.01）. Both gender demonstrated linearly decreasing trends （P<0.01） in average daily feed intake （ADFI） and feed conversion ratio （FCR） as ME levels elevated. 2） Regarding carcass characteristics， dressing percentage， eviscerated yield， and abdominal fat rate in males increased linearly with ME supplementation （P<0.05）. Notably， females demonstrated greater sensitivity to ME stimulation in abdominal fat deposition，the abdominal fat percentage significantly increased （P<0.01）. 3） Serum biochemical profiling identified a unique quadratic fluctuation （P<0.05） in uric acid concentration of male chicks. Based on the relationship between metabolic energy intake and average daily weight gain， the metabolic energy prediction equation for rapid yellow feathered broiler chickens at this developmental stage can be established， which is： Male： Metabolic Energy Requirements （MEr）=1.653 8BW0.75（g）+12.489ADG（g）； Female： MEr=3.360 5BW0.75（g）+7.736 4ADG（g）. The corresponding metabolic energy requirement for male chicks is 379.32 kJ·d-1， while for female chicks， it is 351.66 kJ·d-1， corresponding to feed metabolic energy levels of 12.50 MJ·kg-1 for male chicks and 12.47 MJ·kg-1 for female chicks.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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