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Author: RAJA KISHORE, K × Thesis Type: M.V.Sc. ×
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    ThesisItemOpen Access
    A NEW APPROACH FOR PREDICTING TOTAL DIGESTIBLE NUTRIENT VALUES OF FORAGES - OHIO SUMMATIVE MODEL
    (SRI VENKATESWARA VETERINARY UNIVERSITY TIRUPATI - 517 502. (A.P.) INDIA, 2007-09) RAJA KISHORE, K; PARTHASARATHY, M(MAJOR); RAVI, A; SUDRAKARA REDDY, P
    ABSTRACT: In the present study, an attempt has been made to predict the TDN content of various forages and top feeds by Ohio surnmative model i.e., the equations of Weiss et al. (1992) and compare with the estimated values, and to rank the various forages and tree foliage by the forage quality indices (RFV and RFQ). Thirty feedstuffs (eight cultivated grasses, eight leguminous forages, eight tree leaves and six crop residues) were evaluated using the criteria such as proximate principles, detergent fiber components, ADIN and NDIN. TDN content was calculated using the summative approach of Weiss et al. (1992). Gliricidia, APBN-1 and groundnut haulms were evaluated as sole feed for total tract digestibility of nutrients and nutritive value using four growing male goats. The CP (%) ranged from 5.5 to 10.9 for Cenchms ciliaris and sorghum among grasses, from 1 1.7 to 16.9 for groundnut haulms and sunnhemp among leguminous forages, from 11.5 to 25.6 for acacia and sesbania among tree leaves and from 2.9 to 6.6 for rice straw and horse gram straw among crop residues, on DMB. NDF (%) ranged from 56.1 to 70.4 (grasses), 42.4 to 5 1.8 (leguminous forages), 39.2 to 5 1.8 (top feed resources) and 65.9 to 74.7 (fibrous crop residues). Lignin content (%) was observed to be highest in crop residues (8.7) compared to tree foliage (8.2), leguminous forages (8.2) and cultivated grasses (5.9). Total available N (% of total N) was found to be highest in leguminous forages (94.1) followed by grasses (91. l), tree leaves (90.8) and crop residues (80.8). ADF values (%) predicted from the analysed NDF values using NRC (2001) equations for grasses (39.1) and leguminous forages (37.7) are in conformity with those of estimated ADF values by laboratory analyses. The average TDN (%), ME (Mcal/kg) and q, were found to be on a higher side in tree leaves (59.7, 2.2 and 0.52) in comparison to leguminous forage crops (56.0, 2.0 and 0.50), cultivated grasses (51.9, 1.9 and 0.48) and fibrous crop residues (46.0, 1.6 and 0.42), respectively . Classification of forage crops and top feed resources basing on forage quality indices (RFV and RFQ) showed that the tree leaves rank first ( 14 1 and 134) while crop residues rank last (74 and 64). The total tract digestibility (%) of nutrients with male kids (19.1 f 0.2) was obtained for gliricidia, APBN-1 or GN haulms as sole feed. DM, CP and NDF digestibilities were 54.1, 61.8 and 61.4 (gliricidia), 57.9, 62.6 and 58.0 (APBN-l), 52.6, 54.2 and 41.7 (GN haulms), respectively. The apparent digestibility (%) of CP and NDF in APBN-1 fodder was found to be higher (P<0.01t)h an those of gliricidia and G N haulms in male kids. DCP (%) and TDN (Oh) were 1 1.9 and 53.5 (gliricidia), 3.8 and 61.8 (APBN-I), 6.8 and 55.4 (GN haulms), respectively in kids from in vivo studies. The TDN (%) obtained by the Weiss et al. (1992) equations for gliricidia (55.4). APBN- 1 (60.3) and GN haulms (53.3) are in conformity with that of TDN obtained by in vivo studies. From the present study, it is concluded hat the ine~ilodology of Ohio summative equations of Weiss et al. (1992) prov~de an accurate means to calculate the energy density (TDN) of forages based on chemical analyses and empirical equations, thereby saving time, labour and cost of animal experimentation. Ranking of roughage feed resources as premium, good, fair or poor quality is feasible with the forage quality indices (RFV and RFQ) as suggested by Wisconsin workers (Undersander, 2003).