Journal ArticleDOI
A net carbohydrate and protein system for evaluating cattle diets: II. Carbohydrate and protein availability.
Charles J. Sniffen,J D O'Connor,P.J. Van Soest,Danny G. Fox,James B. Russell,James B. Russell,James B. Russell +6 more
TLDR
The Cornell Net Carbohydrate and Protein System has a submodel that predicts rates of feedstuff degradation in the rumen, the passage of undegraded feed to the lower gut, and the amount of ME and protein that is available to the animal.Abstract:
The Cornell Net Carbohydrate and Protein System (CNCPS) has a submodel that predicts rates of feedstuff degradation in the rumen, the passage of undegraded feed to the lower gut, and the amount of ME and protein that is available to the animal. In the CNCPS, structural carbohydrate (SC) and nonstructural carbohydrate (NSC) are estimated from sequential NDF analyses of the feed. Data from the literature are used to predict fractional rates of SC and NSC degradation. Crude protein is partitioned into five fractions. Fraction A is NPN, which is trichloroacetic (TCA) acid-soluble N. Unavailable or protein bound to cell wall (Fraction C) is derived from acid detergent insoluble nitrogen (ADIP), and slowly degraded true protein (Fraction B3) is neutral detergent insoluble nitrogen (NDIP) minus Fraction C. Rapidly degraded true protein (Fraction B1) is TCA-precipitable protein from the buffer-soluble protein minus NPN. True protein with an intermediate degradation rate (Fraction B2) is the remaining N. Protein degradation rates are estimated by an in vitro procedure that uses Streptomyces griseus protease, and a curve-peeling technique is used to identify rates for each fraction. The amount of carbohydrate or N that is digested in the rumen is determined by the relative rates of degradation and passage. Ruminal passage rates are a function of DMI, particle size, bulk density, and the type of feed that is consumed (e.g., forage vs cereal grain).read more
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Polpa citrica em dietas de vacas em lactacao. 2. Digestibilidade dos nutrientes em dois periodos de coleta de fezes, pH e nitrogenio amoniacal do liquido ruminal
Anderson Jorge de Assis,José Maurício de Souza Campos,Augusto César de Queiroz,Sebastião de Campos Valadares Filho,Ricardo Frederico Euclydes,Rogério de Paula Lana,André Luiz Rodrigues Magalhães,Josué Mendes Neto,Sandro de Souza Mendonça +8 more
TL;DR: In this paper, the effects of replacing corn meal by pelleted citrus pulp in the concentrate in total mixed rations were evaluated on the parameters digestibility of the nutrients and ruminal pH and ammonia concentration during two periods of collection of sample of feces (2 and 5 days).
Journal ArticleDOI
Utilização de óleo de soja em rações para vacas leiteiras no período de transição: consumo, produção e composição do leite
Anselmo Domingos Ferreira Santos,Ciro Alexandre Alves Torres,Francisco Palma Rennó,Mariana Resende Soares Drumond,José Esler de Freitas Júnior +4 more
TL;DR: Em virtude da maior densidade energetica da racao com oleo de soja, as vacas apresentaram maior consumo of nutrientes digestiveis totais e energia liquida no pos-parto no periodo pre e pos- parto.
Journal ArticleDOI
Influência da monensina sódica no consumo e na digestibilidade de dietas com diferentes teores de proteína para ovinos
Marcus Vinicius Morais de Oliveira,Rogério de Paula Lana,Eduardo da Costa Eifert,Dirce Ferreira Luz,José Carlos Pereira,Juan Ramón Olalquiaga Pérez,Fernando Miranda de Vargas Junior +6 more
TL;DR: In this article, the effect of monensin in the apparent digestibility of nutrients in diets with different levels of CP was evaluated and no significant effect on nutrient digestibility was observed.
Journal ArticleDOI
Effects of 2-methylbutyrate on rumen fermentation, ruminal enzyme activities, urinary excretion of purine derivatives and feed digestibility in steers
Wang Chao,Q. Liu,Pei Caixia,H.Y. Li,Wang Yongxin,H. Wang,Y.S. Bai,Z.G. Shi,Liu Xiaoni,Peng Li +9 more
TL;DR: In this article, the effects of 2-methylbutyrate (2MB) supplementation on rumen fermentation, ruminal enzyme activities, urinary excretion of purine derivatives and feed digestibility in the total tract of steers were evaluated.
Journal ArticleDOI
Evaluation of the dry matter intake predictions of the Cornell Net Carbohydrate and Protein System with Holstein and dual-purpose lactating cattle in the tropics
TL;DR: In this article, the authors evaluated the dry matter intake prediction of version 5.0 of the Cornell Net Carbohydrate and Protein System (CNCPS) and found that the CNCPS model underpredicted DMI in Experiment 2 and different degrees of accuracy and bias were evident in Experiment 3.
References
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Journal ArticleDOI
Methods for dietary fiber, neutral detergent fiber, and nonstarch polysaccharides in relation to animal nutrition.
TL;DR: In addition to NDF, new improved methods for total dietary fiber and nonstarch polysaccharides including pectin and beta-glucans now are available and are also of interest in rumen fermentation.
Forage fiber analyses (apparatus, reagents, prcedures, and some applications)
H.K. Goering,P.J. Van Soest +1 more
Journal ArticleDOI
A net carbohydrate and protein system for evaluating cattle diets: I. Ruminal fermentation.
TL;DR: The Cornell Net Carbohydrate and Protein System (CNCPS) has a kinetic submodel that predicts ruminal fermentation and the protein-sparing effect of ionophores is accommodated by decreasing the rate of peptide uptake by 34%.