scholarly journals Influence of Level of Feed Intake on Concentration of Purine Derivatives in Urinary Spot Samples and Microbial Nitrogen Supply in Crossbred Bulls

2006 ◽  
Vol 19 (9) ◽  
pp. 1291-1297 ◽  
Author(s):  
S. K. George ◽  
M. T. Dipu ◽  
U. R. Mehra ◽  
A. K. Verma ◽  
P. Singh
Keyword(s):  
Feed Intake ◽  
Nitrogen Supply ◽  
Purine Derivatives ◽  
Microbial Nitrogen

Post-weaning excretion of purine derivatives by young calves

1995 ◽  
Vol 75 (1) ◽  
pp. 153-156 ◽  
Author(s):  
M. Funaba ◽  
K. Kagiyama ◽  
T. Iriki ◽  
M. Abe
Keyword(s):  
Organic Matter ◽  
Key Words ◽  
Nitrogen Supply ◽  
Purine Derivatives ◽  
Purine Derivative ◽  
Microbial Nitrogen ◽  
Digestible Organic Matter

Intestinal flow of MN was estimated from urinary purine derivative output in calves. Although estimated MN output (g d−1) increased with age, it was restricted to the period between weeks 6 and 11 after weaning when expressed as g d−1 kg−0.75. The estimated MN output to digestible organic matter ratio decreased with time after weaning, although the cubic contrast indicated to be highest on wks 1 and 11. Key words: Microbial nitrogen supply, purine derivatives, growing calves

The effect of species of grass, stage of maturity and level of intake on the degradation of protein and organic matter in the rumen of steers

1990 ◽  
Vol 41 (4) ◽  
pp. 791 ◽  
Author(s):  
FJ Hart ◽  
J Leibholz
Keyword(s):  
Organic Matter ◽  
Feed Intake ◽  
Retention Time ◽  
Avena Sativa ◽  
Nitrogen Flow ◽  
Paspalum Dilatatum ◽  
Microbial Nitrogen ◽  
Late Maturity ◽  
Grass Stage ◽  
Two Stages

Six Friesian steers (300 kg liveweight) were prepared with rumen and abomasal cannulae, and fed three artificially dried grasses at three levels of organic matter (OM) intake and at two stages of maturity. The grasses were paspalum (Paspalum dilatatum), oats (Avena sativa) and kikuyu (Pennisetum clandestinum). The apparent digestion of organic matter (OM) in the whole tract decreased with increasing maturity for all grasses. The proportion of OM digested in the rumen was greater for paspalum and kikuyu than oats, and increased with advancing maturity for paspalum and kikuyu. Microbial nitrogen flow from the rumen was 26 and 25 g/kg of OM apparently digested in the rumen for paspalum, 32 and 36 for oats and 25 and 14 for the early and late maturity kikuyu. The true degradation of grass protein in the rumen was between 0.70 and 0.80 for all three grasses, at all three feed intakes and for both stages of maturity of the grasses. Total rumen pool size was less for oats than paspalum or kikuyu. The retention time of particles and fluid in the rumen increased with decreasing feed intake for oats.

Purine derivatives in spot urine samples and plasma of sheep: a possible index of microbial protein supply

1993 ◽  
Vol 1993 ◽  
pp. 5-5 ◽  
Author(s):  
X. B. Chen ◽  
Adriana T. Mejia ◽  
D. J. Kyle ◽  
E. R. Ørskov
Keyword(s):  
Urinary Excretion ◽  
Feed Intake ◽  
Urine Samples ◽  
Plasma Samples ◽  
Microbial Protein ◽  
Purine Derivatives ◽  
Feeding Regime ◽  
Spot Urine ◽  
Alternative Index ◽  
Protein Supply

In ruminants, daily urinary excretion of purine derivatives (PD) reflects the absorption of microbial purines and can be used as an index of microbial protein supply (Chen, Ørskov and Hovell, 1991). The application could be extended to farm conditions if measurements based on spot urine samples or plasma could serve as an alternative index. The objective of this study was to examine whether PD concentrations in spot urine or plasma samples vary diurnally during a given feeding regime and if they reflect differences in daily PD excretion induced by varying feed intake.

Effects of yeast culture on rumen fermentation and liveweight gain in bulls fed isonitrogenous diets of barley/urea or barley/soya

1992 ◽  
Vol 1992 ◽  
pp. 211-211
Author(s):  
S.M. Elhassan ◽  
R.J. Wallace ◽  
C.J. Newbold ◽  
X.B. Chen ◽  
I.E. Edwards ◽  
...  
Keyword(s):  
Microbial Growth ◽  
Rumen Fluid ◽  
Rumen Fermentation ◽  
Feed Additive ◽  
Yeast Culture ◽  
Purine Derivatives ◽  
Stomach Tube ◽  
Cane Molasses ◽  
Microbial Nitrogen ◽  
Soyabean Meal

Yeast culture (YC) based on Saccharomyces cerevisiae is gaining increasing acceptance as a feed additive for ruminants. Production responses to YC have been reported in growing and lactating animals. It has been suggested that these responses are at least partly due to enhanced microbial growth in and microbial nitrogen flow from the rumen (Williams and Newbold, 1990). The aim of the present study was to investigate the effect of YC on rumen fermentation, microbial growth and liveweight gain in bulls fed isonitrogenous diets containing either urea or soya.Thirty two Limousin cross Friesian bulls (liveweight 344 kg) were allocated to treatments on the basis of previous growth rate and initial liveweight. Animals received mixed diets of barley/urea (92% rolled barley, 5% cane molasses, 1.5% urea and 1.5% minerals/vitamin mix) or barley/soya (86.75% rolled barley, 5% cane molasses, 0.75% urea, 6% soyabean meal and 1.5% minerals/vitamin mix) plus or minus 1.5 kg/ tonne YC (Yea-sacc1026 , Alltech, UK) (Table 1). YC was added to the diet prior to mixing. All rations were offered ad libitum twice daily until slaughter (460 kg). Rumen fluid samples were withdrawn by stomach tube 5 and 10 weeks after the beginning of the trial. The outflow of microbial nitrogen from the rumen was estimated from the appearance of purine derivatives in the urine as described previously (Chen et al., 1990).

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