Goats fed with non-protein nitrogen: ruminal bacterial community and ruminal fermentation, intake, digestibility and nitrogen balance
| Autor: | E.M. Santos, Celso José Bruno de Oliveira, Francisco Naysson de Sousa Santos, A.S.M. Lopes, Núbia Michelle Vieira da Silva, Ariosvaldo Nunes de Medeiros, Marinara Lemos, L.S. Sousa, Paulo Sérgio de Azevedo, Danillo Marte Pereira, J. S. de Oliveira, P. E. N. Givisiez |
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| Rok vydání: | 2020 |
| Předmět: |
0303 health sciences
Nitrogen balance 0402 animal and dairy science 04 agricultural and veterinary sciences 040201 dairy & animal science 03 medical and health sciences Rumen chemistry.chemical_compound Animal science chemistry Latin square Genetics Urea Hay Non-protein nitrogen Animal Science and Zoology Ammonium Ammoniacal nitrogen Agronomy and Crop Science 030304 developmental biology |
| Zdroj: | The Journal of Agricultural Science. 158:781-790 |
| ISSN: | 1469-5146 0021-8596 |
| DOI: | 10.1017/s0021859621000162 |
| Popis: | The current study assessed ruminal fermentation parameters and bacterial community, nutrient intake, nutrient digestibility and nitrogen balance of goats fed diets containing buffel grass hay and ruminal ammonia nitrogen (N-NH3). Five rumen-cannulated mixed-breed castrated adult goats (45 ± 2.3 kg) were used in a 5 × 5 Latin square design represented by five N-NH3 levels (3.43, 9.95, 17.2, 23.0 and 33.7 mg/dl). Control animals were fed hay exclusively. Other treatments were represented by ruminal infusion composed of a mixture containing urea, ammonium sulphate and casein. The increasing N-NH3 concentrations did not affect rumen fluid pH, which averaged 6.43. Rumen ammoniacal nitrogen increased linearly in response to N-NH3. Volatile fatty acids were not affected by increasing N-NH3 concentrations. A higher abundance of Ruminococcaceae (Ruminococcus 1, Ruminococcaceae UCG-014 and Ruminococcaceae NK4A214 group) was observed in the rumen of goats infused with higher concentrations of N-NH3 (17.2 and 33.7 mg/dl N-NH3). There was a quadratic effect (P < 0.050) of N-NH3 levels on neutral detergent fibre intake with maximum values estimated at 13.7 mg/dl N-NH3. Nutrient intake, nitrogen excretion and nitrogen balance presented a positive linear effect (P < 0.050). In conclusion, 3.43 mg/dl of N-NH3 is the minimum level to maintain microbial activity, whereas the recommended level to optimize the microbial community is 14.5 mg/dl of N-NH3 in the rumen of goats fed buffel grass. |
| Databáze: | OpenAIRE |
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