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Matching Livestock Systems with Available Resources |
MEKARN Regional Conference 2007 |
Faculty of
Animal Husbandry, Brawijaya University
Jl. Veteran – Malang, East-Java – Indonesia
kusmartono_ub@yahoo.com
Two experiments involving eighteen growing fat-tailed sheep (Expt1) and three rumen fistulated sheep (Expt 2) were conducted. Average initial body weight of sheep were 25.5 kg (±3.36 kg) and 34.9 kg (± 4.79 kg) in Expts 1 and 2 respectively and they were placed in metabolism cages and subjected to the following treatments: JFW-MUB= Rice straw (ad lib)+Jackfruit wastes (ad lib)+Molasses-Urea-Block (ad lib); JFW-MUBG= JFW-MUB + gliricidia leaves hay (3% of body weight); JFW-MUBC= JFW-MUB + cassava leaves hay (3% of body weight). Parameters measured in Expt 1. were feed intake and daily gain, whilst feed intake, digestibility, rumen pH, concentrations of VFA and nitrogen retention were measured in Expt 2. Data obtained were statistically analysed using a Randomized Block Design (Expt 1), and a Latin Square Design (Expt 2.)
The results showed that intake of JFW was dominant and ranged from 58 up to 70% of total DMI. Crude protein intake (Expt 1) and CPI and digestibility (Expt 2) were increased significantly (P<0.05) by supplementating either gliricidia or cassava leaves hay. A similar value in crude protein digestibility was observed between sheep fed on JFW-MUBG (69.7%) and JFW-MUBC (73.0), but the amount of nitrogen retained was significantly higher in sheep fed on JFW-MUBC (22.2 g/day) than JFW-MUBG (19.22 g/day) and JFW-MUB (13.6 g/day). As a consequence, daily gain obtained was higher in sheep fed on JFW-MUBC (112.0 g/day) than JFW-MUBG (97.1 g/day) and JFW-MUB (95.6 g/day).
It is concluded that roles of JFW as energy source in combination with cassava leaves hay at 3% of animal's body weight as protein sources were significant in improving intake and digestibility value of the ration. A higher CP consumed and nitrogen retained in the body of sheep receiving cassava leaves hay supplementation relative to the other nitrogen source has led to a higher daily gain achieved (112 g/day) than JFW-MUBG (97.1 g/day) and JFW-MUB (95.6 g/day)