Urinary purine derivatives excretion, rumen microbial nitrogen synthesis and the efficiency of utilization of recycled urea in Tibetan and fine-wool sheep

Zhou, Jianwei; Mi, Jiandui; Degen, A. Allan; Ding, Luming; Guo, Xusheng; Shang, Zhanhuan; Wang, W.W.; Long, Ruijun

doi:10.1016/j.anifeedsci.2017.03.005

Cited by 19 publications

(9 citation statements)

References 33 publications

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“…This led Hervás et al () to conclude that a lower acetate:propionate ratio may “reflect a more efficient microbial nitrogen assimilation and growth.” However, the acetate:propionate ratio was generally higher in yaks than in cattle and C × Y in winter but not in summer. Similarly, Zhou et al () reported that Tibetan sheep had a higher ratio than fine‐wool sheep. These authors concluded that this was a result of better cellulose digestibility in the Tibetan sheep.…”

Section: Discussionmentioning

confidence: 89%

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Rumen parameters of yaks (Bos grunniens) and indigenous cattle (Bos taurus) grazing on the Qinghai‐Tibetan Plateau

Shi

Wang

Degen

et al. 2019

Animal Physiology Nutrition

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Yaks and indigenous Qaidam cattle and cattle‐yak crosses (C × Y) graze on the Qinghai‐Tibetan Plateau (QTP) throughout the year, but yaks are raised at higher elevations than cattle. Yaks do not receive supplementary feed whereas cattle require supplementary feed during harsh winter. We hypothesized that yaks would cope with the severe conditions of the QTP better than cattle and utilize the pasture more efficiently. We also hypothesized that differences between species would be pronounced in winter, when conditions are particularly harsh. To test these hypotheses, seasonal rumen fluid parameters of yaks, C × Y and cattle (n = 3 for each) were examined. Rumen fluid was collected in summer and winter from each genotype 2, 5 and 12 hr after a day of grazing. Concentrations of total volatile fatty acid (VFA), acetate, propionate, isobutyrate and isovalerate were greater in yaks than in cattle in summer (p < 0.05), while propionate concentration was lower in yaks than in cattle in winter (p < 0.05). Concentrations of ammonia and urea were greater (p < 0.001) in yaks than in cattle (p < 0.001) in summer, whereas, concentrations of free amino acids (AA) were greater in cattle than in yaks in summer and winter (p < 0.001). Concentrations of total VFA, acetate, propionate and butyrate decreased linearly (p < 0.05), whereas concentrations of isobutyrate and isovalerate increased linearly for yak and C × Y with sampling time (p < 0.05) in summer. In summer, concentrations of isobutyrate and isovalerate were greater in yaks than in cattle (p < 0.05). In conclusion, rumen fermentation characteristics of yaks showed that they coped better than cattle or C × Y in the harsh climate as we hypothesized. However, in contrast to our hypothesis, this emerged only in summer, when pasture was plentiful and not in winter, when pasture was scarce.

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Section: Discussionmentioning

confidence: 89%

“…However, the acetate:propionate ratio was generally higher in yaks than in cattle and C × Y in winter but not in summer. Similarly, Zhou et al (2017) reported that Tibetan sheep had a higher ratio than fine-wool sheep. These authors concluded that this was a result of better cellulose digestibility in the Tibetan sheep.…”

Section: Rumen Ph and Vfamentioning

confidence: 95%

Rumen parameters of yaks (Bos grunniens) and indigenous cattle (Bos taurus) grazing on the Qinghai‐Tibetan Plateau

Shi

Wang

Degen

et al. 2019

Animal Physiology Nutrition

View full text Add to dashboard Cite

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“…The lower acetate-to-propionate ratio provides faster and higher energy for the body, which is beneficial to improve the growth performance of animals (Ma et al 2020a ). The higher acetate-to-propionate ratio means better cellulose digestibility (Zhou et al 2017 ). Our study found that the YAK group exhibited a slightly higher acetate-to-propionate ratio, which matched the fiber digestibility.…”

Section: Discussionmentioning

confidence: 99%

Comparative study of growth performance, nutrient digestibility, and ruminal and fecal bacterial community between yaks and cattle-yaks raised by stall-feeding

Dai

Cao

et al. 2021

AMB Expr

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The experiment was conducted to compare the growth performance, rumen fermentation, nutrient digestibility, and ruminal and fecal bacterial community between yaks and cattle-yaks. Ten male yaks (36-month-old) were used as the yak (YAK) group and 10 male cattle-yaks with similar age were selected as the cattle-yak (CAY) group. All the animals were fed same ration and the experiment lasted for 60 days. The results showed that the average daily gain and dry matter intake of CAY group were higher (P < 0.05) than those of YAK group. The ruminal concentrations of total volatile fatty acids, acetate, and butyrate were higher (P < 0.05) in CAY group than those in YAK group. However, the neutral detergent fiber and acid detergent fiber digestibility exhibited an opposite between two groups. In the rumen, the relative abundances of Prevotella 1 and Prevotellaceae UCG-001 were higher (P < 0.05) and Succiniclasticum and Butyrivibrio 2 were lower (P < 0.05) in YAK group compared to CAY group. In the feces, the unclassified Lachnospiraceae, Lachnospiraceae NK4A136 group, and Lachnospiraceae AC2044 group were significantly enriched (P < 0.05) in YAK group, whereas the Ruminococcaceae UCG-010, Ruminococcaceae UCG-013, and Succiniclasticum were significantly enriched (P < 0.05) in CAY group. Overall, under the same diet, the yaks have higher fiber utilization and cattle-yaks have higher energy utilization.

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“…Tibetan sheep, indigenous to the Qinghai–Tibetan Plateau and well‐adapted to the harsh conditions, are raised at altitudes between 3,000 and 5,000 m. They are maintained under traditional management and grazed on the rangeland all year round without receiving any supplements, even in the harsh winter when pasture is scarce and of poor quality (Zhou et al, ). Consequently, forage intake can fluctuate greatly over the year; daily dry matter intake of grazing Tibetan sheep was 116 g/kg 0.75 in summer, but was only 59 g/kg 0.75 in winter (Dan, Long, Zhang, Zhang , & Ding, 2).…”

Section: Introductionmentioning

confidence: 99%

Effect of dietary energy on digestibilities, rumen fermentation, urinary purine derivatives and serum metabolites in Tibetan and small‐tailed Han sheep

Zhou

Jing

Degen

et al. 2019

Animal Physiology Nutrition

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Tibetan sheep are indigenous to the Qinghai–Tibetan Plateau, graze the grassland all year round without supplementation and are well‐adapted to the harsh conditions. Small‐tailed Han sheep were introduced to the plateau and are raised mainly in feedlots. Based on their different backgrounds, we hypothesized that the ability to cope with poor diets would be better in Tibetan than in Han sheep. To test our prediction, we examined the effect of dietary energy on apparent digestibilities, rumen fermentation, urinary purine derivatives and serum metabolites by using a 4 × 4 Latin square design in each sheep breed. Four diets were formulated to be low in crude protein (~7%) but to differ in metabolizable energy concentration. Average daily gain was greater in Tibetan than in Han sheep (p < 0.01) and increased linearly with an increase in energy intake (p < 0.001). The digestibilities of dry matter, organic matter, gross energy, and neutral and acid detergent fibres were greater in Tibetan than in Han sheep (p < 0.05). Ruminal pH was lower (p < 0.05), while volatile fatty acids (VFAs), urea‐N, ammonia‐N and soluble protein‐N concentrations were higher (p < 0.05) in Tibetan than in Han sheep. As a molar proportion of total VFA, acetate decreased (p < 0.001) with an increase in dietary energy whereas propionate and butyrate increased (p < 0.05). Urinary purine derivative excretion was greater in Tibetan than in Han sheep (p < 0.01), as was microbial nitrogen production; both parameters increased with dietary energy (p < 0.01). Serum concentrations of glucose, insulin and insulin‐like growth factor‐1 increased (p < 0.05) as energy level increased, while non‐esterified fatty acids and growth hormone decreased (p < 0.05). It was concluded that Tibetan sheep were better able to cope with low‐protein, low‐energy diets and, consequently, our prediction was supported.

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Urinary purine derivatives excretion, rumen microbial nitrogen synthesis and the efficiency of utilization of recycled urea in Tibetan and fine-wool sheep

Cited by 19 publications

References 33 publications

Rumen parameters of yaks (Bos grunniens) and indigenous cattle (Bos taurus) grazing on the Qinghai‐Tibetan Plateau

Rumen parameters of yaks (Bos grunniens) and indigenous cattle (Bos taurus) grazing on the Qinghai‐Tibetan Plateau

Comparative study of growth performance, nutrient digestibility, and ruminal and fecal bacterial community between yaks and cattle-yaks raised by stall-feeding

Effect of dietary energy on digestibilities, rumen fermentation, urinary purine derivatives and serum metabolites in Tibetan and small‐tailed Han sheep

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