Document Detail


Predicting forage indigestible NDF from lignin concentration.
MedLine Citation:
PMID:  9621956     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
We used chemical composition and in vitro digestibility data from temperate and tropical forages to develop relationships between indices of lignification and forage indigestible NDF. Neutral detergent fiber indigestibility increased nonlinearly as the lignin concentration of the NDF increased. Differences in estimated indigestible NDF using equations developed for a specific forage class (C3 and C4 grasses and legumes) were small and are probably not biologically significant when compared to those estimated from a common equation. Selected equations were compared with the Cornell Net Carbohydrate and Protein System (CNCPS) for the prediction of ADG. The linear equation (2.4 times NDF lignin content) used by the CNCPS and the Beef NRC had some of the largest errors due to mean bias. A log-log model [4.37 x (lignin/NDF)(.84)] provided the best combination of low total prediction error, low mean bias, and minimal error due to regression bias when permanganate lignin was used. A similar equation based on sulfuric acid lignin [6.17 x (lignin/NDF)(.77)] also met the above criteria. These equations then were evaluated with the CNCPS model against animal growth data from diets ranging in forage quality. Regardless of the equation used for predicting unavailable fiber, the CNCPS underpredicted daily gain, with mean biases ranging from -.10 to -.22 kg/d. Regression bias ranged from .13 to .14 kg/d and the coefficients differed from unity (P = .0001). The new equations gave numerically lower energy allowable ADG by steers compared to the linear equation currently used by the CNCPS model. The estimates were lower due to a higher predicted indigestible NDF, which resulted in a lower estimated forage energy value.
Authors:
M J Traxler; D G Fox; P J Van Soest; A N Pell; C E Lascano; D P Lanna; J E Moore; R P Lana; M Vélez; A Flores
Related Documents :
15260266 - Modeling optical properties of liquid-crystal devices by numerical solution of time-har...
24130526 - Challenges for the understanding of the dynamics of social coordination.
24257936 - Use of large enclosures for perturbation experiments in lentic ecosystems: a review.
22517676 - Avian predators as a biological control system of common vole (microtus arvalis) popula...
8381236 - Application of a natural diamond detector for the measurement of relative dose distribu...
23715116 - Molecular dynamics studies of material property effects on thermal boundary conductance.
Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Journal of animal science     Volume:  76     ISSN:  0021-8812     ISO Abbreviation:  J. Anim. Sci.     Publication Date:  1998 May 
Date Detail:
Created Date:  1998-07-09     Completed Date:  1998-07-09     Revised Date:  2003-11-14    
Medline Journal Info:
Nlm Unique ID:  8003002     Medline TA:  J Anim Sci     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  1469-80     Citation Subset:  IM    
Affiliation:
Department of Animal Science, Cornell University, Ithaca, NY 14853, USA.
Export Citation:
APA/MLA Format     Download EndNote     Download BibTex
MeSH Terms
Descriptor/Qualifier:
Animal Feed / analysis*
Animals
Dietary Fiber / analysis*
Digestion
Fabaceae / chemistry*
Fermentation
Florida
Latin America
Lignin / analysis*
Linear Models
Models, Biological*
Plants, Medicinal*
Poaceae / chemistry*
Rumen / physiology
Tropical Climate
Chemical
Reg. No./Substance:
9005-53-2/Lignin

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


Previous Document:  Uterine and ovarian responses to puberty induction and pregnancy in prepubertal gilts.
Next Document:  Effects of a dietary mixture of meat and bone meal, feather meal, blood meal, and fish meal on nitro...