Determination of nutritive value of fruit and vegetable wastes in animal nutrition using in vivo and in vitro techniques

A study was conducted to evaluate the nutritive value of fruit and vegetable wastes (FVW) as ruminant feed. Samples were obtained from central fruit and vegetable market of Karaj, weekly during six months of July, August, September, October, November and December and analysed according to AOAC (1990) procedure. The average of DM, CP, Ash, CF, EE, NFE, NFC, NDF, ADF, ADL, Ca and P in percentage, Cu, Zn and Pb, as mg/Kg and GE in cal/gr DM were respectively in Summer: 11.62, 14.73,22.55,12.24,1.44,49.04,28.55,32.71,20.47, 3.57, ].4], 0.34, 13.22, 61.74, 4.16 and 3308.7 and in Autumn: 11.11, 13.3, 26.05, 12.3, 1.76, 46.57, 25.97, 32.9, 21.33, 3.66, 1.81, 0.32, 15.49, 91.41, 14.34 and 3152.38 . In summer no significant differences were observed among the above mentioned measurements except for DM, Ash, NDF and P (p0.05). In autumn the differences among the months for DM, ADL, Cu and Pb were not significant but differences between other chemical composition were significant (p0.05). The average of in vitro DMD, OMD and DOMD were 73.68::1:6.08, 77.32::1:6.14 and 60::1:7.1 percent in summer and 68.73::1:0.607, 72.61::1:0.359 and 53.67::1:2.14 percent in autumn respectively, but the differences among the different months were not significant. The in vivo digestibility of FVW was measured only for air-dried sample of August and November in each season. Total fecal collection method was appJied using four wether sheep. The digestibility of DM, OM, CP, CF, EE, NFE and GE were: 56.22::1:1.32, 70.24::1:0.78, 66.44::1:1.2, 55.02::1:2.85, 59.1 ]::1:1.98, 75.17::1:0.17 and 68.38::1:1.38 percent in summer and 58.9::1:1.41, 73.63::1:1.32, 67.29::1:1.91, 59.2::1:4.27, 53.21::1:3.31, 80.08::1:0.59 and 70.94::1:1.91 percent in autunm respectively. The TDN content of the sample was 50.9.:i:0.57 and 55.16::1:1.85 percent in summer and autumn respectively. In another experiment, characteristics of silages with three levels of molasses (0, 2 and 4 percent) and 4 levels of initial dry matter (25, 30, 35 and 40 percent) evaluated by factorial method in CRD. Results expressed that in summer, silage with 4 percent of molasses and 35 percent of dry matter via pH equal to 4.98 and evaluatiOn grade of 16.58 from 20 and in autumn silage with 4 percent of molasses and 30 percent of dry matter via pH equal to 4.27 and evaluation grade of 15.8 from 20 were selected as the best silages.