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Rumen liquor from slaughtered cattle as inoculum for feed evaluation

Animal Nutrition 2017年第3期3卷 300-308页

作者： Pius Lutakome Fred Kabi Francis Tibayungwa Germana H.Laswai abiliza kimambo Cyprian Ebong World Agroforestry Centre(ICRAF) Uganda Country Office Department of Agricultural Production School of Agricultural SciencesCollege of Agricultural and Environmental Sciences Makerere University Department of Animal Aquaculture and Range SciencesSokoine University of Agriculture Association for Strengthening Agricultural Research in East and Central Africa(ASARECA) Secretariat

Use of nonlinear mathematical models has been majorly based on in vitro gas production(GP) data generated when substrates are incubated with rumen liquor from fistulated steers. However,existing evidence suggests that rumen liquor from slaughtered cattle of unknown dietary history also generates quantifiable in vitro GP data. Fitting and description of GP data obtained from 4 diets incubated with rumen liquor from slaughtered cattle was evaluated using single-pool exponential model with discrete lag time(EXPL), logistic(LOG), Groot's(GRTS) and Gompertz(GOMP) models. Diets were formulated by varying proportions of Rhodes grass(Chloris gayana) hay and a concentrate mixed on dry matter basis to be: 1,000 g/kg Rhodes grass hay(RGH) and 0 of the concentrate(D1), 900 g/kg RGH and 100 g/kg concentrate(D2), 800 g/kg RGH and 200 g/kg concentrate(D3), 700 g/kg RGH and 300 g/kg concentrate(D4). Dietary kinetics for the models were determined by measuring GP at 2,4.8,10.18,24.36,48.72,96 and 120 h. Model comparison was based on derived GP kinetics, graphical analysis of observed versus predicted GP profiles plus residual distribution and goodness-of-fit from analysis of root mean square error(RMSE), adjusted coefficient of determination(Adj-R^2) and Akaike's information criterion(AIC). Asymptotic GP, half-life and fractional rate of GP differed(P < 0.001) among the 4 models. The RMSE, Adj-R^2 and AIC ranged from 1.555 to 4.429,0.906 to0.984 and 2.452 to 15.874, respectively, forall diets compared across the 4 models. Based on the goodness-of-fit statistical criterion, GP profiles of D1 were more appropriately fitted and described by GRTS and GOMP than the EXPLand LOG models. The GRTS model had the lowest AIC value for D2(2.452). Although GRTS model had the most homogenous residual dispersion for the 4 diets, all the 4 models exhibited a sigmoidal ***, rumen liquor from slaughtered cattle of unknown dietary history can be used to derive nutritionally important fee

关键词： In vitro gas production technique Model comparison Model selection Nonlinear mathematical models Rhodes grass hay Rumen liquor

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