| 付敏,陈天宝,欧阳佚亭,赖靖雯,陈敏,曾洪良.饲粮能氮比对简州大耳羊粪便排泄参数及微生物区系的影响[J].农业环境科学学报,2023,42(7):1597-1605. |
| 饲粮能氮比对简州大耳羊粪便排泄参数及微生物区系的影响 |
| Effects of dietary energy to nitrogen ratios on fecal excretion parameters and microflora of Jianzhou Da'er goats |
| 投稿时间：2023-02-23 |
| DOI：10.11654/jaes.2023-0129 |
| 中文关键词: 简州大耳羊 能氮比 粪便排泄参数 氮排泄参数 微生物区系 |
| 英文关键词: Jianzhou Da'er goat dietary energy to nitrogen ratio fecal excretion parameter nitrogen excretion parameter microflora |
| 基金项目:四川省财政运行专项（SASA2023CZYX005） |
| 作者 | 单位 | E-mail | | 付敏 | 四川省畜牧科学研究院, 动物遗传育种四川省重点实验室, 成都 610000 | | | 陈天宝 | 四川省畜牧科学研究院, 动物遗传育种四川省重点实验室, 成都 610000 | 3493200595@qq.com | | 欧阳佚亭 | 四川省畜牧科学研究院, 动物遗传育种四川省重点实验室, 成都 610000 | | | 赖靖雯 | 四川省畜牧科学研究院, 动物遗传育种四川省重点实验室, 成都 610000 | | | 陈敏 | 四川省畜牧科学研究院, 动物遗传育种四川省重点实验室, 成都 610000 | | | 曾洪良 | 四川省畜牧科学研究院, 动物遗传育种四川省重点实验室, 成都 610000 | |
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| 中文摘要: |
| 为探索全价颗粒饲粮不同能氮比对全舍饲简州大耳羊粪便排泄参数、氮排泄参数以及粪便微生物区系的影响，选择32只（公母各半）（26.16±2.39）kg的6月龄健康简州大耳羊，随机分到a、b、c、d组，分别饲喂能氮比为0.59、0.51、0.43、0.35的全价颗粒饲粮，开展 12 d全收粪尿试验，并采集新鲜直肠粪便测定微生物区系。结果表明：降低饲粮能氮比对试验羊干物质采食量、粪便及尿液排泄参数、氮排泄率和粪氮排泄量均无显著影响，但粪便pH、尿总氮、尿氨氮、日排总氮、单位代谢体质量尿氮和总氮的日排泄量均呈线性增加。随着饲粮能氮比降低，a、b、c组粪便微生物区系无显著差异，但 d组 Shannon指数和 Simpson指数降低；在门水平上，d组厚壁菌门的相对丰度降低，疣微菌门和放线菌门的相对丰度提高；在细菌属水平上，艾克曼菌属的相对丰度提高。综上所述，降低全价颗粒饲粮能氮比将提高简州大耳粪便pH、增加尿氮的排泄，而且能氮比过低（0.35）会影响粪便微生物区系，进而影响机体健康。 |
| 英文摘要: |
| This study was conducted to investigate the effects of complete pellet diets with different energy to nitrogen ratios on fecal excretion parameters, nitrogen excretion parameters, and fecal microflora of Jianzhou Da'er goats. In total, 32 six-month-old healthy Jianzhou Da'er goats（16 male and 16 female）with a body weight of approximately（26.16±2.39）kg were randomly divided into groups a, b, c, and d. They were fed with whole-valent pellet diets with a ratio of metabolic energy to nitrogen（ME/N）of 0.59, 0.51, 0.43, and 0.35, respectively. We collected all feces and urine during a 12-day metabolic test, and then, the fresh rectal feces was collected on the last day to test the microflora. The results showed that reducing the ME/N did not significantly affect the dry matter intake, feces, and urine excretion parameters, or the excretion of fecal nitrogen and nitrogen excretion rate of the experimental goats in each group. However, the fecal pH, excretion of urine nitrogen, urine ammonia nitrogen, total nitrogen increased linearly with the decrease in ME/N. With declining ME/N, there were no significant differences in fecal microflora among groups a to c; however the Shannon and Simpson indices in group d decreased. At the bacterial phyla level, the relative abundance of Firmicutes was significantly decreased, and the relative abundance of Verrucomicrobiota and Actinobacteriota were significantly increased in group d. At the bacterial genus level, the relative abundance of Ekmann in group d was significantly higher than that in the other three groups. The results indicate that the fecal pH and urine nitrogen excretion would be increased with the decrease in the level of ME/N. Moreover, when the ME/N（ME/N=0.35）is extremely low, the fecal microflora will be affected, which causes negative implications for the animals. |
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