Faculty Opinions recommendation of Extensive management promotes plant and microbial nitrogen retention in temperate grassland.

The aim of this study was to evaluate the nutritional value of three sorghum cultivars with different concentrations of condensed tannins in sheep diets. Six adult sheep (LW=56kg) with rumen and duodenal fistulas were assigned to experimental groups using two 3x3 Latin Square designs. The diets were formulated using three sorghum cultivars: LTC (low-tannin cultivar), MTC (medium-tannin cultivar) and HTC (high-tannin cultivar). Microbial nitrogen (MN) concentration in the duodenum was measured using a 15N trace technique. LTC, MTC and HTC diets presented values of 788, 722 and 747 (SE=20.6) g kg-1 for dry matter digestibility and 633, 535 and 530 (SE=35.8) g/kg for crude protein digestibility. The LTC diet was significantly different from the other diets (P<0.05). The nitrogen balance was 145.5, 94.8 and 83.8g kg-1 (SE=13.0) for LTC, MTC and HTC, respectively, with LTC showing greater nitrogen retention (P<0.05). Values obtained for MN in the digesta were 301, 364 and 469 (SE=30.6) g kg-1 for LTC, MTC and HTC, respectively, and there was no statistical difference (P>0.05) between the diets. The presence of condensed tannins in the sorghum interfered with the sheep's nitrogen retention; however, the microbial protein supply to the duodenum of the animals was not inhibited.

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The Effects of Dietary Crude Protein Levels on Nutrient Digestibility, Nitrogen Retention, Rumen Environment and Microbial Nitrogen Synthesis of Growing Female Bach Thao Goats in Vietnam

Modern Agricultural Science and Technology ◽

10.15341/mast(2375-9402)/03.03.2017/006 ◽

2017 ◽

Vol 3 (3) ◽

pp. 30-36

Author(s):

Nguyen Van Thu

Keyword(s):

Crude Protein ◽

Nitrogen Retention ◽

Nutrient Digestibility ◽

Protein Levels ◽

Dietary Crude Protein ◽

Microbial Nitrogen

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Effect of dietary replacement of alfalfa with urea-treated almond hulls on intake, growth, digestibility, microbial nitrogen, nitrogen retention, ruminal fermentation, and blood parameters in fattening lambs1

Journal of Animal Science ◽

10.2527/jas.2015-9437 ◽

2016 ◽

Vol 94 (1) ◽

pp. 349-358 ◽

Cited By ~ 5

Author(s):

M. Imani Rad ◽

Y. Rouzbehan ◽

J. Rezaei

Keyword(s):

Nitrogen Retention ◽

Blood Parameters ◽

Ruminal Fermentation ◽

Microbial Nitrogen

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Ruminal and post-ruminal protein digestion in sheep fed on subterranean clover harvested at four stages of maturity

Australian Journal of Agricultural Research ◽

10.1071/ar9750199 ◽

1975 ◽

Vol 26 (1) ◽

pp. 199 ◽

Cited By ~ 16

Author(s):

ID Hume ◽

DB Purser

Keyword(s):

Nitrogen Retention ◽

Subterranean Clover ◽

Causal Factor ◽

Protein Digestion ◽

Microbial Protein ◽

Dietary Nitrogen ◽

Microbial Nitrogen ◽

Digestible Organic Matter ◽

Faecal Nitrogen ◽

Ruminal Digestion

Digestion of the protein of subterranean clover harvested at four stages of maturity was studied in Merino wethers fitted with re-entrant duodenal cannulae. The relative proportions of dietary and microbial nitrogen flowing into the duodenum were estimated from the incorporation into microbial protein of sulphur-35 from ruminal infusions of Na235SO4. Sheep given immature clover consumed more digestible organic matter (DOM) and retained more nitrogen per 100 g DOM intake than sheep given wilted and mature clovers. More protein of the immature clover was degraded in the rumen (73%) than of the mature clover (43–53%); post-ruminal digestibility of dietary protein escaping ruminal proteolysis was also higher for the immature clover (67–70% versus 51–53%). The quantities of clover protein (per 100 g DOM intake) digested post-ruminally were therefore similar at all stages of maturity. The yield of microbial protein (mean 19.9 g per 100 g OM digested in the rumen) was also similar on all treatments. However, ruminal digestion of the DOM of the immature clover was more complete (84%) than that of the mature clover (60–71%); consequently, microbial protein production per 100 g DOM intake was greater on the immature clover. Greater nitrogen retention by animals consuming immature clover was associated with a greater DOM intake. Whether the causal factor was the greater supply of microbial protein per 100 g DOM, or whether the causal factor was a greater DOM intake controlled by factors associated with ruminal digestion, is unresolved. It is also apparent that the greater faecal nitrogen losses per 100 g DOM intake on the mature clover compared with the immature clover were attributable entirely to differences in the amounts of dietary nitrogen excreted at different stages of maturity of the clover.

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