The use of cell wall organic matter components and in vitro degradability characteristics to predict intake and digestibility of white clover for sheep

1995 ◽  
Vol 46 (6) ◽  
pp. 1111 ◽  
Author(s):  
KS Nandra ◽  
VH Oddy ◽  
JF Ayres ◽  
PJ Nicholls ◽  
B Langevad ◽  
...  
Keyword(s):  
Cell Wall ◽  
Organic Matter ◽  
White Clover ◽  
Good Precision ◽  
Digestible Organic Matter ◽  
Predictive Relations ◽  
Voluntary Intake ◽  
Organic Matter Digestibility

The relations of the laboratory measurement of cell wall organic matter (CWOM) components and of the in vitro degradability characteristics of CWOM with in vivo digestibility and voluntary intake for high quality white clover were investigated. The voluntary intake, apparent digestibility and apparent rumen retention time of CWOM of white clover harvested at various stages of maturity were measured in rumen-cannulated Merino wether sheep. The in vitro degradability characteristics of CWOM of these diets were also measured. This study has quantified strong predictive relations between structural fibre constituents or degradation parameters and both digestibility and intake for white clover. The CWOM, cellulose and hemicellulose contents and potential degradability of CWOM of the white clover predicted in vivo organic matter digestibility with good precision (r2 = 0.74, 0.67, 0.72 and 0.72 respectively). The voluntary intakes of organic matter and digestible organic matter of the white clover were strongly related to CWOM, cellulose and hemicellulose contents and to the rate of degradation of CWOM in the rumen and the fits of these relations were at least as good as those predicting organic matter digestibility. The predictive equations based on CWOM: OMD (g/kg) = 97.6-0.081 (� 0.012) CWOM OMI (g/kg) = 83-0.085 (� 0.018) CWOM DOMI (g/kg) = 71.4-0.098 (� 0.015) CWOM are recommended because of the ease of analysis of CWOM in the laboratory.

The prediction of digestibility by rumen fluid and enzymatic methods

1996 ◽  
Vol 1996 ◽  
pp. 211-211
Author(s):  
Peter Young ◽  
F. P. O'Mara ◽  
M. Rath ◽  
P. J. Caffrey
Keyword(s):  
Organic Matter ◽  
Rumen Fluid ◽  
Organic Matter Digestibility ◽  
Enzymatic Methods

Rumen fluid and cellulase based techniques are widely used to predict the digestibility of compound feeds and their ingredients. Recently gammanase enzymes have been added to some cellulase based techniques (Dowman, 1993; De Boever et al., 1994). Few comparisons of these techniques have involved by-product concentrate ingredients. The objective of this experiment was to compare the ability of three techniques, in vitro rumen fluid (RF), pepsin cellulase gammanase (PCG), and neutral detergent cellulase gammanase (NCDG), to predict the in vivo organic matter digestibility (OMD) of concentrate ingredients.

The prediction of digestibility by rumen fluid and enzymatic methods

1996 ◽  
Vol 1996 ◽  
pp. 211-211
Author(s):  
Peter Young ◽  
F. P. O'Mara ◽  
M. Rath ◽  
P. J. Caffrey
Keyword(s):  
Organic Matter ◽  
Rumen Fluid ◽  
Organic Matter Digestibility ◽  
Enzymatic Methods

Rumen fluid and cellulase based techniques are widely used to predict the digestibility of compound feeds and their ingredients. Recently gammanase enzymes have been added to some cellulase based techniques (Dowman, 1993; De Boever et al., 1994). Few comparisons of these techniques have involved by-product concentrate ingredients. The objective of this experiment was to compare the ability of three techniques, in vitro rumen fluid (RF), pepsin cellulase gammanase (PCG), and neutral detergent cellulase gammanase (NCDG), to predict the in vivo organic matter digestibility (OMD) of concentrate ingredients.

Prediction of forage digestibility from some laboratory procedures. 2. Comparison of in vivo digestibility at two institutes.

1971 ◽  
Vol 19 (2) ◽  
pp. 106-113
Author(s):  
B. Deinum
Keyword(s):  
Cell Wall ◽  
Organic Matter ◽  
Sulfuric Acid ◽  
Lignin Content ◽  
Forage Digestibility ◽  
Significant Difference ◽  
Laboratory Procedures ◽  
Sulfuric Acid Lignin

For part 1 see Abst. 1564, Vol. 40. 2. The relation between digestibilities of organic matter in vivo and in vitro did not differ significantly between the institutes at Hoorn and Wageningen. No difference was found in digestibility of the cell wall constituents in relation to the lignin content, nor was there a significant difference in the relation between the percentage of digestible cell contents and the percentage of cell contents in forage from well managed pastures. Twelve forages of highly digestible perennial ryegrass deviated from these farm forages at Wageningen, showing smaller excretion of bacterial and endogenous residue. Comparison of the 2 lignin procedures showed that 72% sulfuric acid lignin gave consistent residual standard deviations of digestibility of cell wall constituents; permanganate lignin gave smaller errors in forages at Wageningen but greater errors in forages at Hoorn. (Abstract retrieved from CAB Abstracts by CABI’s permission)

Nutritive value of the olive leaf: effects of cultivar, season of harvesting and system of drying

1992 ◽  
Vol 119 (2) ◽  
pp. 205-210 ◽  
Author(s):  
A. Cabrera-Gomez ◽  
A. Garrido ◽  
J. E. Guerrero ◽  
V. Ortiz
Keyword(s):  
Organic Matter ◽  
Chemical Composition ◽  
Nutritive Value ◽  
Drying Procedures ◽  
Significant Difference ◽  
Different Seasons ◽  
Organic Matter Digestibility ◽  
Olive Trees

SUMMARYLeaves of olive trees (Olea europaea L.) of eight cultivars, Manzanilla, Picual, Hojiblanca, Edremit, Conservolia, Picholine-Marroqui, Chemlali and Frantoio, were collected in different seasons and years in Córdoba, Spain. Their chemical composition and in vitro organic matter digestibility values were determined. Differences in composition and nutritive value between cultivars, years and seasons were studied in Manzanilla, Picual and Hojiblanca, the three most important local cultivars. There were significant differences both between cultivars and seasons (P < 0·05) and a non-significant difference between years.The effect of various drying procedures (fresh, oven-dried, air-dried indoors or air-dried outdoors) on chemical composition, in vitro digestibility and in vivo digestibility in sheep was also examined. The in vivo organic matter digestibility of fresh leaves was significantly higher than that of dried leaves. No difference was found between leaves air-dried indoors and oven-dried leaves. However, leaves air-dried outdoors were significantly less digestible. Quick drying in an oven reduced the digestibility of crude protein and acid detergent fibres compared to air drying indoors. There was a significant decrease in digestibility of 11% when leaves were dried separated from the branches as compared to leaves dried on the branches.

The effects of grinding, supplementation and incubation period on cellulose digestibility in vitro and its relationship with cellulose and organic matter digestibility in vivo

1970 ◽  
Vol 74 (3) ◽  
pp. 445-451 ◽  
Author(s):  
R. J. Wilkins ◽  
D. J. Minson
Keyword(s):  
Organic Matter ◽  
Incubation Period ◽  
Soluble Organic Matter ◽  
Rhodes Grass ◽  
Residual Standard Deviation ◽  
Cellulose Digestibility ◽  
Organic Matter Digestibility ◽  
Residual Errors

SUMMARYThe in vitro cellulose digestibility of thirteen cuts of perennial ryegrass, cocksfoot and two varieties of Rhodes grass was determined under different conditions. Cellulose digestibility was increased by increasing the length of the incubation period (1,2 and 6 days), the fineness of grinding of the samples and by addition of a supplement. The effects of fineness of grinding and of supplement were greatest after incubation for 1 day and least after 6 days. Between-run variation in cellulose digestibility was reduced by the supplement and by increasing the length of the incubation period.In a comparison of different methods of predicting in vivo organic matter digestibility the lowest residual standard deviation ( ± 2·29) was with in vitro organic matter digestibility (1 mm screen and incubated with supplement for 2 days). Other residual errors were: in vitro cellulose digestibility ± 2·40, pepsin-soluble organic matter ± 4·93, total available carbohydrate ± 6·39, cellulose ± 6·40 and nitrogen ± 6·46.

A note on the storage of sodium hydroxide-treated whole-crop barley beneath grass and lucerne silage

1983 ◽  
Vol 36 (1) ◽  
pp. 143-146 ◽  
Author(s):  
A. Moore ◽  
C. Harris
Keyword(s):  
Organic Matter ◽  
Chemical Analysis ◽  
Thin Layer ◽  
Dairy Cows ◽  
Sodium Hydroxide ◽  
Dry Matter ◽  
Microbiological Examination ◽  
Digestible Organic Matter ◽  
Organic Matter Digestibility

ABSTRACTOne hundred tonnes of spring-sown barley harvested as whole crop were treated on a commercial farm with pearl sodium hydroxide at 46 g/kg dry matter.The treated material was stored in a silage clamp beneath grass and lucerne silage. A thin layer of grass, cut and wilted to hay-making dry matter, was placed immediately on top of the barley to absorb any silage effluent.Monthly samples were taken for microbiological examination and chemical analysis throughout winter storage, while the material was fed to British Friesian dairy cows. There was no evidence of fermentation by clostridia in the whole-crop barley or wilted grass and there was no spoilage of the exposed feeding face. The treatment increased the in vitro organic matter digestibility and the in vitro digestible organic matter in the dry matter of the whole-crop barley. No excessive urination or other ill effects were observed in the stock.The method proved practical for the satisfactory storage and feeding of sodium hydroxide-treated whole-crop barley.

The constancy of the digested cell wall in grass

1974 ◽  
Vol 83 (2) ◽  
pp. 295-298 ◽  
Author(s):  
K. W. Moir
Keyword(s):  
Cell Wall ◽  
Organic Matter ◽  
Nitrogen Fertilizer ◽  
Total Cell ◽  
Digitaria Decumbens ◽  
Different Levels

SUMMARYThe quantity of in vitro digested cell wall was determined in the separated leaf and stem of Digitaria decumbens (pangola grass) fertilized at three different levels of nitrogen and cut after two different periods of regrowth. The treatment means ranged from 39·6 to 41·5 g digested cell wall per 100 g forage organic matter in leaf, and from 37·5 to 41·6 g in stem. For both leaf and stem the lowest mean amounts of digested cell wall were associated with the highest levels of fertilizer and the longer periods of regrowth. The results for nitrogen fertilizer were consistent with those from previous in vivo digestibility experiments, but when the effect of the total cell wall on digested cell wall was taken into account there were inconsistencies. The previous in vivo digestibility data were used in conjunction with the present results in support of a view that interpretation of digestibility data for grasses is best made by reference to a constant digested cell wall of 39·5 g/100 g forage organic matter.

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