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View the PDF document Studies on voluntary feed intake, growth, optimal energy and protein requirements of growing lambs of the Fiji Fantastic (FF) sheep
Author:Rokomatu, Isikeli.
Institution: University of the South Pacific.
Award: M.Sc.
Subject: Sheep -- Feeding and feeds -- Fiji , Sheep -- Fiji -- Nutrition, Sheep -- Feed utilization efficiency -- Fiji
Date: 2004.
Call No.: pac SF 376 .R65 2004
BRN: 977884
Copyright:Over 80% of this thesis may be copied without the authors written permission

Abstract: Two experiments were carried out to investigate the voluntary feed intake, growth rate, protein and energy requirements of the farm born Fiji Fantastic (FF) sheep. In experiment 1 (dry season) eighteen FF sheep with pre-experimental body weight of 25.6±0.82 kg and between 5- 6 months were randomly allotted to three groups of six sheep per dietary treatments of forage, concentrate mixture and crushed wheat in a completely randomized design experiment for 92 days, These three diets had 8.2, 16.4 and 13.8 % crude protein (CP) and gross energy (GE) contents of 15.5, 13.1 and 13.9 MJ/kg, respectively. Voluntary dry matter intake (DMI) and average daily gain (ADG), blood urea-N (BUN) and blood glucose concentrations were significantly higher (P<0.001) in FF sheep on concentrate mixture than for sheep on forage and crushed wheat which were not significantly different from each other. ADG of sheep on forage, concentrate mixture and crushed wheat were 34, 75 and 42g/d, respectively. Water intake (WI) of sheep on forage was significantly higher (P<0.001) than those on concentrate mixture and crushed wheat diets. Apparent digestibility coefficients of dry matter (DM), crude protein (CP), organic matter (OM), acid detergent fibre (ADF), acid detergent lignin (ADL) and energy; digestible energy (DE) and metabolizable energy intake (MEI), were significantly higher (P<0.001) in sheep on concentrate mixture. Also, daily crude protein (DCP) intake of sheep were significantly (P<.001) different at 3.39, 10.39 and 5.60 g/kg0.75/day for forage, concentrate mixture and crushed wheat, respectively. The FF sheep on the concentrate mixture performed better than those on forage alone and crushed wheat diets in all parameters investigated. In experiment 2 (wet season) thirty sheep with pre-trial average body weight of 20.9±0.46kg and between 4-5 months were divided into five groups of six sheep per dietary treatment in a completely randomized design experiment for 84 days. The experimental diets were high protein, high energy (HPHE), high protein, medium energy (HPME), high protein, low energy (HPLE), medium protein, medium energy (MPME) and low protein, medium energy (LPME). The protein and gross energy levels of the diets ranged from 13 to 16.5 % and 17.60 to 21.60 MJ/kg DM, respectively. Total DMI and ADG of sheep on HPHE, HPME, HPLE, MPME and LPME diets were 671, 676, 735, 708 and 641 g/day and 82, 121, 109, 111 and 80 g/d, respectively. Significant (P<0.001) differences existed among sheep in DMI, but not in ADG (P>0.001). Differences in WI were not significant (P>0.001) among the FF sheep on HPHE, HPME, HPLE, MPME and LPME. Blood urea-Nitrogen (BUN) and Blood glucose (BG) were significantly different (P<.001) among sheep on the five experimental diets. The digestibility of DM, OM, CP, ADF, ADL, and hemicellulose were significantly (P<0.001) different among sheep on the five diets. Sheep on the LPME diet had the lowest DM, OM, CP and ADF digestibility, but highest in the digestibility of ADL and hemicellulose. DCP intake was lowest (P<0.001) in sheep on LPME, while MEI was significantly (P<0.001) higher in sheep on HPHE diet than on other diets. This study has provided information on the level of voluntary feed intake and also demonstrated the need for supplementation of forage diet for FF sheep in Fiji. Dietary CP of 15 to 16.5 % and GE of 17.6 to 19.0 MJ GE/kg will satisfy the requirements of the FF sheep for maximum growth in the tropical environment of Fiji. HPME diet that had 16.5 % CP plus 19.0 MJ GE/kg body weight was the best and the FF sheep on it had the highest live weight gain of 121 g/d.
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