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      Evaluation of models for prediction of the energy value of diets for growing cattle from the chemical composition of feeds

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          Abstract

          The objective of this study was to estimate and evaluate the contents of apparently digestible fractions of crude protein, ether extract and non-fibrous carbohydrates, the digestible fraction of the neutral detergent fiber and the content of total digestible nutrients (TDN) from the chemical composition of feeds in growing cattle fed different diets. Fourteen F1 Red Angus × Nellore young bulls with average age and weight of 12 months and 287±36 kg were used. Animals were fed elephant grass silage, corn silage or signal grass hay, with or without supplementation of 200 g concentrate per kg of the total diet. The experiment consisted of two 13-days periods, in which the concentrate supplementation was crossed over animals. The values of digestible fractions and the TDN content observed were obtained based on total collection of feces. Several sub-models applied to the different digestible fractions were assessed and discussed. Estimates of the TDN content in the diet were produced from the combination of sub-models applied to the individual digestible fractions. The TDN content was more efficiently predicted from the sub-models proposed by Detmann et al. (2010) when biological procedures for the estimation of the undegradable fraction of the protein and the potentially degradable fraction of the neutral detergent fiber were considered.

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          Most cited references27

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          Gravimetric determination of amylase-treated neutral detergent fiber in feeds with refluxing in beakers or crucibles: collaborative study.

          As an important constituent of animal feeds, fiber represents the portion of feeds that is bulky and difficult to digest. The neutral detergent fiber (NDF) method, developed over 30 years ago, is the method of choice for measuring total fiber in forages and other feeds. Several modifications that were made to improve its general applicability to all feeds and others developed in individual laboratories often resulted in variability among laboratories in measuring NDF. The amylase-treated NDF (aNDF) method, therefore, was developed as an accurate and precise method of measuring total insoluble fiber in feeds. A collaborative study was conducted to evaluate the repeatability and reproducibility of the aNDF method over the full range of animal feed materials. Twelve laboratories representing research, feed company, regulatory, and commercial feed testing laboratories analyzed 11 materials as blind duplicates. The materials represented feed matrixes, including animal products; high-protein, high-fat, and high-pectin feeds; oil seeds; grains; heated by-product feeds; and legume and grass hays and silages. Materials selected varied in chemical composition and contained 0-90% aNDF, 1-16% ash, 1-20% crude fat, 1-40% crude protein, and 0-50% starch. Correcting results for changes in blanks and reporting results as ash-free aNDF organic matter (aNDFom) improved the repeatability and reproducibility of results when aNDF was 10% fat. However, standard deviations of repeatability and reproducibility for feeds with >10% fat were similar to those of other materials. It is recommended that the aNDF method be accepted for Official First Action status.
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            Nutritional Ecology of the Ruminant

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              Standardization of procedures for nitrogen fractionation of ruminant feeds

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                Author and article information

                Journal
                rbz
                Revista Brasileira de Zootecnia
                R. Bras. Zootec.
                Sociedade Brasileira de Zootecnia (Viçosa, MG, Brazil )
                1516-3598
                1806-9290
                September 2012
                : 41
                : 9
                : 2110-2123
                Affiliations
                [01] Viçosa MG orgnameUniversidade Federal de Viçosa orgdiv1Programa de Pós-Graduação em Zootecnia Brazil
                [02] Viçosa MG orgnameUniversidade Federal de Viçosa orgdiv1Departamento de Zootecnia
                [03] Itapeting BA orgnameUniversidade Estadual do Sudoeste da Bahia orgdiv1Departamento de Estudos Básicos e Instrumentais Brazil
                [04] Campos dos Goytacazes RJ orgnameUniversidade Estadual do Norte Fluminense orgdiv1Centro de Ciências e Tecnologias Agropecuárias Brazil
                Article
                S1516-35982012000900020 S1516-3598(12)04100920
                10.1590/S1516-35982012000900020
                5277e964-a0ab-4462-97c4-e8719531e4ca

                This work is licensed under a Creative Commons Attribution 4.0 International License.

                History
                : 26 April 2012
                : 16 June 2011
                Page count
                Figures: 0, Tables: 0, Equations: 0, References: 29, Pages: 14
                Product

                SciELO Brazil

                Categories
                Ruminants

                apparently digestible fractions,total digestible nutrients,feed analysis

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