Evaluation of Kinetic Models of Ruminant Intake And Digestibility Utilizing Tropical Grasses
Evaluation of Kinetic Models of Ruminant Intake And Digestibility Utilizing Tropical Grasses
Abrams, Stephen M.
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Initial analysis of NDF residue, as a function of time and the discrete variables in the statistical model, was accomplished by least squares analysis (Snedecor and Cochran, 1967), using the GLM procedure of SAS (SAS Institute, 1976). TYPE-1 sums of squares were used for polynomial effects and TYPE-3 sums of squares for all other effects. NDF residue was then fitted, one run at a time, to three models, utilizing the NUN procedure of SAS: NDF residue - De" kl ^ t_L ^+ U (for t>L) (1) = D + U (fo...r t ( t_L) + D:>e~ kl 2 ( t_L) + U (for t>L) (2) = Dj + D 2 + U (for t ki 2 , k 13 , and km. Model (1) is a lag time model, model (2) assumes two separate potentially digestible pools ( a fast and a slow digesting pool, Di or D 2 ), each with its own rate of digestion (kn or ki 2 ), and model (3) is a sequential model that assumes NDF disappearance occurs in two phases, disappearing at k i3 and k lk , respectively.
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