V. Fievez, Ann Vandeweghe, B. Vlaeminck, L. Mbanzamihigo, L. Carlier, D. Demeyer
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Although simultaneous feeding of maize silage with grass changed patterns of rumen ammonia concentrations, no change in urinary excretion of purine derivatives was observed. Hence, faecal or urinary N excretion was unaffected by the supplementation strategy. Microbial growth efficiency was estimated from urinary excretion of purine derivatives and fermented OM. The latter was calculated from total rumen CH4 production, based on rumen fermentation stoichiometry and taking into account proportional concentrations of individual volatile fatty acids. Higher levels of intake tended to improve rumen microbial growth efficiency slightly (rpearson=0.406), which, however, could not compensate for the reduced effective rumen DM degradability (rpearson =‐0.442). The latter was apparently associated with a partial shift of the fermentation from the rumen to the hindgut, as suggested from the negative correlation (rprarson =‐0.745) between faecal RNA concentrations and rumen effective degradability.","PeriodicalId":8141,"journal":{"name":"Archiv für Tierernaehrung","volume":null,"pages":null},"PeriodicalIF":0.0000,"publicationDate":"2001-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"1","resultStr":"{\"title\":\"Effect of N fertilisation rate, energy supplementation and supplementation strategy on efficiency of N utilisation in the sheep rumen\",\"authors\":\"V. Fievez, Ann Vandeweghe, B. Vlaeminck, L. Mbanzamihigo, L. Carlier, D. 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引用次数: 1
摘要
利用四种瘤胃模拟天气,研究了放牧季节初(5月底)和末(8月底)割草施肥氮肥(200 vs 400 kg N ha‐1年‐1)以及玉米和草同时或分开饲喂(400 kg N ha‐1年‐1)对瘤胃氮素利用效率的影响。施氮量增加一倍,草CP产量增加约60%,但瘤胃可降解氮大量过剩,尿尿素排泄量高(rpearson = 0.747)。饲喂较少施肥或较老草或添加玉米青贮时,后者较低(最高74%)。虽然玉米青贮与草同时饲喂改变了瘤胃氨浓度的变化规律,但尿中嘌呤衍生物的排泄量没有变化。因此,粪便或尿氮排泄不受补充策略的影响。通过尿中嘌呤衍生物和发酵OM的排泄来估计微生物的生长效率。后者是根据瘤胃发酵化学计量学并考虑单个挥发性脂肪酸的比例浓度,由瘤胃总甲烷产量计算得出的。较高的采食量可略微提高瘤胃微生物生长效率(rpearson=0.406),但不能弥补瘤胃DM有效降解率的降低(rpearson=‐0.442)。粪便RNA浓度与瘤胃有效降解率呈负相关(rprarson =‐0.745),后者明显与发酵从瘤胃向后肠的部分转移有关。
Effect of N fertilisation rate, energy supplementation and supplementation strategy on efficiency of N utilisation in the sheep rumen
The effect of nitrogen (N) fertilisation (200 vs. 400 kg N ha‐1 year‐1) of pasture cut in the beginning (end of May) and the end (end of August) of the grazing season and of simultaneous or separated feeding of maize and grass (400 kg N ha‐1 year‐1) on efficiency of N utilisation in the rumen has been studied using four rumen canulated wethers. Doubling N fertiliser rate increased grass CP production by about 60%, but induced extensive excess of rumen degradable N, reflected in high urinary urea excretion (rpearson = 0.747). The latter was lower (74% at the maximum) when feeding less fertilised or older grass or when supplementing with maize silage. Although simultaneous feeding of maize silage with grass changed patterns of rumen ammonia concentrations, no change in urinary excretion of purine derivatives was observed. Hence, faecal or urinary N excretion was unaffected by the supplementation strategy. Microbial growth efficiency was estimated from urinary excretion of purine derivatives and fermented OM. The latter was calculated from total rumen CH4 production, based on rumen fermentation stoichiometry and taking into account proportional concentrations of individual volatile fatty acids. Higher levels of intake tended to improve rumen microbial growth efficiency slightly (rpearson=0.406), which, however, could not compensate for the reduced effective rumen DM degradability (rpearson =‐0.442). The latter was apparently associated with a partial shift of the fermentation from the rumen to the hindgut, as suggested from the negative correlation (rprarson =‐0.745) between faecal RNA concentrations and rumen effective degradability.