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20111
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Subject: Animal Nutrition × Author: MALISETTY VENKATESWARLU, U × End date: 2011 × Start date: 2011 × Thesis Type: Ph.D ×
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    ThesisItemOpen Access
    DEVELOPMENT OF FEEDING PRACTICES FOR OPTIMUM GROWTH AND CARCASS CHARACTERISTICS IN WEANED/GROWING RAM LAMBS
    (SRI VENKATESWARA VETERINARY UNIVERSITY TIRUPATI - 517 502. (A.P.) INDIA, 2011-02) MALISETTY VENKATESWARLU, U; RAMANA REDDY, Y(MAJOR); NAGALAKSHMI, D; RAJASEKHAR KEDDY, A; MAHENDER, M
    ABSTRACT: The first experiment was conducted to develop a suitable feeding system to early weaned Nellore ram lambs by feeding traditional creep (R-I), creep plus berseem hay (R-11) and sorghum straw (unconventional) based creep (R-111) for the first one month followed by sorghum straw based wmplete ration (50:50) for remaining four months period to all the three groups for obtaining optimum growth at lower cost. The second investigation was carried out by feeding sorghum straw (Sorghum bicolor) based wmplete rations at the ratio of 70:30 (CR-I), 60:40 (CR-II), 50:50 (CR-111) and 40:60 (CR-IV) for I80 days to find out suitable ratio of sorghum straw and concentrate feed in the economic wmplete ration (mash form) for optimum growth, production and carcass characteristics in Nellore ram lambs. The third experiment was conducted on-farm in Nellore ram lambs by feeding intensively for five months period with sole maize silage (R-I), silage + concentrate at 0.5 per cent body weight (R-11). silage + concentrate at 1.0 per cent body weight (R-III), silage + wncentrate at 1.5 per cent body weight (R-IV), silage + lucerne hay (R-V) and silage + GN haulms (R-VI) to develilp a feeding system based on maize (Zea mays) silage with supplementation of wncentrate mixture and or legume hay/straw at appropriate level for optimum growth, production and carcass characteristics and compared with the performance of ram lambs fed sweet sorghum bagasse based complete diet (R-VII). The first experiment with early weaned ram lambs. the weight gain (kg) and average daily gains (g) were non significantly different among the lambs fed different creep rations. The FCR was significantly (Pc0.01) higher by 9.17 and 19.98 per cent in ram lambs fed R-I and R-I1 rations, respectively in comparison to lambs fed R-111 ration (unconventional creep). Cost (Rs.)/kg live weight gain was significantly (P<0.01) lower by 14.60 and 16.56 per cent in lambs fed R-I and R-I11 rations, respectively in comparison to those fed R-I1 ration. The DCP intake (g/d or g/kg w0 ") was significantl y (P<0.05) higher by 1 1.9 1, 1 8.75 and 1 3.90 and 1 5.14 per cent in ram lambs fed R-I ration in comparison to those fed R-I1 and R-Ill rations, respectively. TDN (g/d) and ME (W/d) intake in early weaned ram lambs fed R-I, R-I1 and R-I11 rations were comparable among the creep rations. In the second growth trail with complete rations containing different ratios of sorghum straw and concentrate in Nellore ram lambs, the ADG was significantly (PK0.05) different among the four experimental complete rations. No difference was found in ADG between CR-I and CR-I1 rations and also between CR-111 and R-IV rations. There was 69.35, 39.58 and 17.72 per cent higher gain, respectively in lambs fed CR-IV ration than CR-I, CR-I1 and CR-I11 rations. The FCR was lower (P<0.01) by 1 1.87, 16.91 and 22.54 per cent with CR-111, CR-I1 and CR-I rations, respectively in comparison to CR-IV ration. Cost (Rs.) per kg live weight gain was significantly (P<0.01) highest in the ram lambs fed CR-rV ration and was lowest in CR-I and it was lower by 4.53, 14.33 and 20.84 per cent, respectively in comparison to CR-11, CR-I11 and CR-IV rations. The DM1 (g/d) increased significantly (P<0.05) as the level of concentrate increased in the complete rations. No significant difference was found in digestibilities of DM, OM, EE, CF and NFE. However, CP digestibility was higher either significantly or non significantly by 2.12, 5.50 and 9.36 per cent, respectively in lambs fed CR-I1 (P>0.05), CR-111 (P>0.05) and CR-IV (P4.05) rations in comparison to lambs fed CR-I ration. Further, CP digestibility was higher by 7.09 and 3.66 per cent in lambs fed CR-IV ration than those fed CR-I1 (P<0.05) and CR-I11 (PB0.05) ration. The average NDF, ADF, hemicelluloses and cellulose digestibility coefficients were non significantly different among the four rations. The DCP content of complete rations was progressively increased significantl y (P<0.05) by 19.49, 4 1.1 7 and 64.12 per cent in CR-11. CR-111 and CR-IV rations, respectively in comparison to CR-I ration as the level of concentrate increased from 30% to 60% in the diet. TDN (%), DE (MJkg DM) and ME (MJAcg DM) values were higher either significantl y or non significantly by 5.13-5.16, 9.39-9.51 and 14.65-14.67 per cent in lambs fed CR-I1 (P>O.OS), CR-I11 (Pc0.05) and CR-IV (Pc0.05) rations, respectively. The N intake (g/d) was significantly (PO.O5), 133.46 (P<0.01) and 198.87 (Pc0.01) per cent with CR-11, CR-I11 and CR-IV rations, respectively in comparison to CR-I ration. The N balance expressed as per cent intake or per cent absorbed was comparable among the four complete rations. The DCP intake (g/d) was significantly higher by 34.26, 56.80 and 99.86 per cent, respectively with CR-11, CR- 111 and CR-IV rations in wmparison to CR-I ration. Intakes of TDN (gld), DE (MJId) and ME (MJ/d) were significantly (P