Estimation of energetic value of Sistan & Balochestan range plants through mathematical models based on Tilly and Terry method

This study was conducted to determine the amount of usable energy in Sistan and Baluchestan range plants for livestock to obtain of regression equations and completing the Iranian feed composition tables. The raw data were collected from the Animal Nutrition Laboratory of Animal Science Research Institute (ASRI) (from 1987 to 2011) and Animal Nutrition Laboratory of Tehran University as well as final report of some research projects. The Tilly & Terry experimental data used. Linear, logarithmic, inverse, quadratic, cubic, power, S, and exponential fitted equations with SPSS software from DOMD data were very significant. Among the fitted equations, the linear for its precision was chosen. For ME estimation of Sistan & Balochestan range plants DOMD as independent predictor and in this regard estimated metabolizable energy was equal: ME (Mcal/ DM) = -6.147E - 15 0.0037 (DOMD g/Kg). ME estimation of metabolizable and net energy for lactation (NEL) of Sistan & Balochestan range plants was 1.78 base on tilly & terry method and NEL was 1.09 Mcal/Kg DM. Net energy for maintenance (NEm) and net energy for growth (NEg) were receptively 0.94 and 0.38 Mcal/Kg DM.