Comparison of methods to determine the energy value of feeds for ruminants
Journal Title: Revista MVZ Cordoba - Year 2012, Vol 17, Issue 3
Abstract
Objective. Compare different methods (MET) to calculate TND based on chemical analysis of diets and digestibility trials. Materials and methods. in vivo digestibility trials were determined using zebu animals fed hay (Cynodon dactylon L. Pers. cv. Tifton 85), corn and soybean meal. The in vitro digestibility followed the Tilley and Terry (1963) methodology (TT). Methods for estimating TND were: conventional (MET 1), calorimetric based on the combustion values quantified in a bomb calorimeter (MET 2), calorimetric based on table combustion heat values (MET 3), based on the in vivo e in vitro organic matter digestibility (MET 4), and based on the multi-compartment model by the NRC (2001) (MET 5). Data was analyzed by a completely randomized design and comparison of the average effect was conducted using Tukey test (α=5%). The Bland-Altman method was used to evaluate the exchangeability between TND values obtained from TT assay (MET 4) and MET 5. Results. The TND values estimated in vivo by MET 1, MET 3 y MET 4 showed no statistical difference (p>0.05) but differed from the value obtained by MET 2 (p<0.05), which was lower. TND values estimated by MET 5 were not exchangeable with those obtained by TT assay, which were above the ranges established by literature. Conclusions. TND estimate by MET 2 proved to be more reliable, because it did not include assumptions or omissions for energy values of the organic components. MET 5 proved to be promising for the calculation of TND.
Authors and Affiliations
Sandra Posada O, Ph. D *| Universidad de Antioquia, Facultad de Ciencias Agrarias, Grupo de Investigación en Ciencias Animales-GRICA, AA 1226, Medellín, Colombia.Correspondencia: slposada@agronica.udea.edu.co, Ricardo Rosero N, Ph. D| Universidad de Antioquia, Facultad de Ciencias Agrarias, Grupo de Investigación en Ciencias Animales-GRICA, AA 1226, Medellín, Colombia., Norberto Rodríguez, Ph. D| Universidade Federal de Minas Gerais, Escola de Veterinária, CEP 31270-901, Belo Horizonte, Brasil., Ana Costa C, Ph. D| Universidade Federal de Minas Gerais, Escola de Veterinária, CEP 31270-901, Belo Horizonte, Brasil.
Keywords
Related Articles
- EP ID EP3274
- DOI -
- Views 467
- Downloads 22
The productive performance of brown egg-laying hens induced to molt at different ages
Objective. The application of the ovarian rest technique on brown egg layer birds was evaluated in this investigation as well as the effect of age and feed duration withdrawal have over their productive behavior. Materia...
Seasons and planting densities interaction on forage production of eight hybrids maize, Ecuador
Objective. To assess the interaction effect of the season and planting densities on the production of eight INIAP corn hybrids. Materials and methods. A research process was conducted in 2013. It was applied a split - sp...
Neospora caninum serostatus in dairy cattle of the Northern plains of Antioquia, Colombia
Objectives. To determine Neospora caninum seroprevalence in nonvaccinated dairy cattle from the Northern plains of Antioquia. Materials and methods. A cross-sectional study was conducted to determine the prevalence of ne...
Effect on weight gain, rumen bioactivity and rumen pH in weaned sheep using fresh rumen fluid from cattle
Objetive. To determine the effect on weight gain, rumen bioactivity and rumen pH in weaned sheep using fresh rumen fluid (FRF) from cattle. Materials and methods. Nine weaned sheep with (aproximated same age and weight),...
GLOBALIZATION AND HEALTH: The case of tropical and neglected diseases
This paper aims to review the impact of globalization on the determinants of illness-health and well-being and provides a look at possible mitigation actions. This paper is based upon on a systematic review of the litera...