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| Effects of dietary energy to nitrogen ratios on fecal excretion parameters and microflora of Jianzhou Da'er goats |
| Received:February 23, 2023 |
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| KeyWord:Jianzhou Da'er goat;dietary energy to nitrogen ratio;fecal excretion parameter;nitrogen excretion parameter;microflora |
| Author Name | Affiliation | E-mail | | FU Min | Sichuan Animal Sciences Academy, Animal Breeding and Genetics Key Laboratory of Sichuan Province, Chengdu 610000, China | | | CHEN Tianbao | Sichuan Animal Sciences Academy, Animal Breeding and Genetics Key Laboratory of Sichuan Province, Chengdu 610000, China | 3493200595@qq.com | | OUYANG Yiting | Sichuan Animal Sciences Academy, Animal Breeding and Genetics Key Laboratory of Sichuan Province, Chengdu 610000, China | | | LAI Jingwen | Sichuan Animal Sciences Academy, Animal Breeding and Genetics Key Laboratory of Sichuan Province, Chengdu 610000, China | | | CHEN Min | Sichuan Animal Sciences Academy, Animal Breeding and Genetics Key Laboratory of Sichuan Province, Chengdu 610000, China | | | ZENG Hongliang | Sichuan Animal Sciences Academy, Animal Breeding and Genetics Key Laboratory of Sichuan Province, Chengdu 610000, China | |
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| Abstract: |
| 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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