The significance of small vs large intestinal digestion of cereal grain and oilseed protein in the equine |
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| Authors: | P.G. Gibbs PhD G.D. Potter PhD G.T. Schelling PhD J.L. Kreider PhD C.L. Boyd DVM |
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| Affiliation: | 1. Department of Agriculture, Forestry and Food Sciences, University of Torino, Grugliasco, Italy;2. Accademia di Agricoltura di Torino, Torino, Italy;3. Institute of Sciences of Food Production, National Research Council, Grugliasco, Italy;1. UMR PAM A 02.102 Université Bourgogne-Franche-Comté/AgroSup Dijon, Dijon, France;2. Lab to Field, Dijon, France;1. Departamento de Zootecnia, Escola de Veterinária, Universidade Federal de Minas Gerais, Belo Horizonte, Minas Gerais, Brazil;2. Autonomous Veterinarian, Montes Claros Minas Gerais, Brazil;3. Emerita, Department of Animal Science, School of Environmental and Biological Sciences, Rutgers, the State University of New Jersey, Howell, NJ;1. Plant & Food Research Ltd., Private Bag 11600, Palmerston North 4410, New Zealand;2. AgResearch Ltd., Private Bag 3123, Hamilton 3240, New Zealand;3. AgResearch Ltd., Private Bag 11008, Palmerston North 4410, New Zealand;4. Riddet Institute, Massey University, Palmerston North 4442, New Zealand;5. Gravida: National Centre for Growth and Development, The University of Auckland, Auckland 1142, New Zealand |
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| Abstract: | Mature ponies fitted with permanent ileal cannulas were used in two 3×3 Latin square experiments to quantify prececal, postileal and total tract digestion of N. In trial 1, corn, oats and sorghum were each fed with coastal Bermuda grass hay in 75:25 ratios. Apparent prececal digestibilities were similar (P>.05) and averaged 46.6%. By-difference procedures were employed to calculate digestibility of the cereal grain N only and apparent prececal N digestibility averaged 57.1%. In trial 2, a basal corn and hay diet was supplemented with cottonseed meal and soybean meal. Apparent total tract N digestibilities were similar (P>.05) across treatments, and prececal digestibility averaged 45.6%. By-difference calculations were used to determine digestibility of SBM and CSM N alone. Apparent prececal digestibility of SBM was 52.5% and was lower (P<.05) than 81.2% for CSM. It is possible that inadequate or excessive heat treatment of SBM affected enzymatic digestion. True digestibility of total rations fed in trial 2 was estimated by linear regression of nitrogen digested on nitrogen intake or N presented to the large intestine. True N digestibility of diets containing SBM and CSM was 54.7% and 69.4%, respectively. |
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| Keywords: | Horses Digestion Nitrogen Grains Supplements |
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