088 Effect of level of dietary sulfur on in vitro true digestibility of a commercial ration fed to Dorper wethers

2017 ◽  
Vol 95 (suppl_4) ◽  
pp. 44-44
Author(s):  
V. Garza ◽  
K. C. McCuistion ◽  
G. Faz ◽  
C. L. Lara ◽  
J. J. Martinez ◽  
...  
Keyword(s):  
True Digestibility

EFFECT OF STRUCTURAL AND CHEMICAL FACTORS OF FORAGES ON POTENTIALLY DIGESTIBLE FIBER, INTAKE, AND TRUE DIGESTIBILITY BY RUMINANTS

1988 ◽  
Vol 68 (3) ◽  
pp. 787-799 ◽  
Author(s):  
V. GIRARD ◽  
G. DUPUIS
Keyword(s):  
Cell Wall ◽  
Dry Matter ◽  
Plant Cell Wall ◽  
Neutral Detergent Fiber ◽  
Optimum Number ◽  
Apparent Digestibility ◽  
Cool Season ◽  
Dry Matter Digestibility ◽  
True Digestibility

In view of the large variation found in plant cell wall digestibilities with ruminants, an attempt was made to group 124 feeds into different lignification classes (clusters) on the basis of chemical characteristics. Each feed cluster was described using a structural coefficient [Formula: see text] that related the potentially digestible fiber (PDF, %) to the ratio between lignin and cell wall volume. The optimum number of clusters was determined iteratively by performing a regression of the apparent digestibility of dry matter at maintenance level (DDM1, %) against the PDF and cell soluble (SOL, %) contents of feeds. The [Formula: see text] coefficients varied from 0.05 (grains, N = 13) to 1.85 (corn silage, N = 3) and increased with the maturity of the grasses from 0.88 (legumes, vegetative cool season grasses, N = 26) to 1.33 (mature, cool season grasses, N = 19). Predicted PDF were closely correlated (r > 0.9, P < 0.01) to in vitro cell wall disappearances (IVCWD). Apparently digestible cell wall in four grasses and four legumes increased linearly with 96-h IVCWD and standard error (SE) was similar to the SE of predicted apparent digestible SOL from SOL concentrations. Assuming that similarity between SE could be also observed in larger samples, PDF and SOL were used in summative equations to predict apparent dry matter digestibility. DDM1 discounted for intake (DDM1 – 4, %) was regressed against SOL and PDF concentrations of 87 feeds:[Formula: see text]with ds and df, the true digestibilities of SOL and PDF. Estimates of ds and df were 0.98 and 0.95 for a zero-production (maintenance) level of intake, and 0.91 and 0.79 for an intake level four times maintenance. Since the true digestibility of the PDF component was only 4% – 13% lower than that of the cell soluble component, the concentration of PDF in cell wall was the major determinant in the variation in apparent digestibility of forages. Key words: lignin, neutral detergent fiber, true digestibility, cluster analysis, feeds

scholarly journals Substitution of Filter Paper for Crucibles in the in Vitro Rumen True Digestibility Determination

1972 ◽  
Vol 55 (9) ◽  
pp. 1305-1307 ◽  
Author(s):  
J.B. Robertson ◽  
P.J. Van Soest ◽  
Filemon Torres
Keyword(s):  
Filter Paper ◽  
True Digestibility

552 Effects of fibrolytic enzyme on in-vitro true digestibility of by-products commonly fed to cattle

2017 ◽  
Vol 95 (suppl_4) ◽  
pp. 270-270
Author(s):  
L. Barbosa Kondratovich ◽  
J. O. Sarturi ◽  
M. A. Ballou ◽  
D. Sugg ◽  
P. R. B. Campanili ◽  
...  
Keyword(s):  
True Digestibility ◽  
By Products

Leaf and stem nutritive value of timothy genotypes under varying N fertilization

2004 ◽  
Vol 84 (4) ◽  
pp. 1101-1104 ◽  
Author(s):  
G. Bélanger ◽  
A. Brégard ◽  
R. Michaud ◽  
G. F. Tremblay
Keyword(s):  
Cell Wall ◽  
Nutritive Value ◽  
N Fertilization ◽  
Phleum Pratense ◽  
Neutral Detergent Fiber ◽  
Acid Detergent Fiber ◽  
True Digestibility ◽  
Sib Families ◽  
Phleum Pratense L

Populations and half-sib families of timothy (Phleum pratense L.), contrasting in forage N concentration, were studied in two experiments conducted in growth rooms with varying N applications. They differed in leaf and stem in vitro true digestibility (IVTD) of DM and in vitro cell wall digestibility (IVCWD), and in stem neutral detergent fiber (NDF) concentration; this confirms the presence of genetic variability for leaf and stem nutritive value in timothy under both limiting and non-limiting N conditions. Key words: Digestibility, grasses, Phleum pratense, neutral detergent fiber, acid detergent fiber

scholarly journals Preservation Method of Rumen Fluid Collected From Harvested Cattle Alters in vitro Digestibility of Reference Feedstuffs

2021 ◽  
Vol 2 ◽  
Author(s):  
Taylor J. Garcia ◽  
Nichole M. Cherry ◽  
Kimberly A. Guay ◽  
Jeffrey A. Brady ◽  
James P. Muir ◽  
...  
Keyword(s):  
Rice Bran ◽  
Rumen Fluid ◽  
In Vitro Digestibility ◽  
Viable Option ◽  
Liquid Samples ◽  
Coastal Bermudagrass ◽  
Preservation Method ◽  
True Digestibility ◽  
Design Factors

The objective of our experiment was to evaluate preservation and revitalization strategies for rumen inoculum anticipating research and veterinary applications. Rumen fluid samples were collected from 12 harvested cattle. Liquid samples were divided into five 500-mL aliquots which were randomly allocated to one of five treatments in a 2 × 2 + 1 augmented factorial design. Factors included preservation method [freezing (FZN) or lyophilization (LYO)] and preservative (glycerol; + or –). A fresh control (CON) was maintained from each sample. Feedstuffs used in this experiment were alfalfa hay, Coastal bermudagrass hay, cracked maize, rice bran, and soybean meal. Reference feedstuffs were subjected to batch culture in vitro true digestibility (IVTD) and in vitro NDF digestibility (IVNDFD) assays using inoculum from each of the five treatments. There was an effect (P &lt; 0.05) of preservation method, preservative, and their interaction for both IVTD and IVNDFD of each of the five references feedstuffs. Freezing or lyophilization of rumen inoculum reduced (P &lt; 0.05) IVTD and IVNDFD of reference feeds relative to the CON. Despite lower degradation of feeds when frozen or lyophilized rumen fluid was used rather than fresh, differences between them in IVTD and IVNDFD suggest that, in the absence of fresh inoculum, preserved rumen fluid may be a viable option for veterinary applications, such as transfaunation, but likely will not be viable for research applications.

Chemical composition, dry matter and crude protein digestibilities of some tropical browse plants estimated in vitro

1998 ◽  
Vol 22 ◽  
pp. 297-299
Author(s):  
C. M. Shayo ◽  
P. Udén
Keyword(s):  
Chemical Composition ◽  
Phenolic Compounds ◽  
Crude Protein ◽  
Dry Matter ◽  
Regression Line ◽  
Dry Season ◽  
Important Food ◽  
True Digestibility ◽  
The Tropics

Browse plants are generally regarded as important food resources for ruminants in the tropics due to their high levels of nitrogen. Particularly during the dry season livestock eat browse which may contain considerable amounts of phenolic compounds including tannins at levels of up to half of the dry matter (Reed, 1986). Tannins are known to react with proteins to form rumen undegradable or totally indigestible complexes.A uniform food fraction is assumed to have the same true digestibility irrespective of source and level in the food. In the test of uniformity developed by Lucas (1964) and applied by Van Soest (1967) the digestible fraction per unit food is regressed upon its concentration in the food. The slope of the line gives its true digestibility, the intercept, the potential metabolic fraction and the variation around the regression line explains the extent of uniformity of the fraction.

scholarly journals Season production of 11 Panicum maximun cultivars harvested at a 45-day interval

1969 ◽  
Vol 75 (1) ◽  
pp. 61-66
Author(s):  
Rafael Ramos-Santana ◽  
José E. Rodríguez-Arroyo
Keyword(s):  
Dry Matter ◽  
Long Day ◽  
True Digestibility ◽  
Harvest Intervals ◽  
Productive Potential ◽  
Guinea Grass ◽  
Short Days

The productive potential of 11 guinea grass forage genotypes was evaluated at harvest intervals of 45 days during the short and long day seasons. Guinea grass genotypes PRPI 3637 and 3622 produced the highest dry matter yields. P. maximun PRPI 12917 (cultivar Makueny) was not different from 3637 or 3622 during short days; however, during long days it differed from cultivar 3637. In vitro true digestibility (IVTD) estimated by the predicting equation of Arroyo-Aguilú and Coward-Lord was similar for most cultivars under evaluation. Cultivar Guadalupe produced the highest IVTD values during both seasons. Among all genotypes, P. maximun 3637 and 3634 consistently had the highest average regrowth percentages and the best capacity to recover.

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