Graduate Thesis Or Dissertation
 

Evaluation of tropical forages and by-product feeds for rabbit production

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  • An evaluation was made on the nutritive value of tropical forages and by-product feeds for rabbit production. Digestibility of nutrient fractions, feed preferences, growth, combination of forages, supplementation of micro and macro nutrients and/or effects of drying temperature on the quality of four groups of forages, namely woody legumes (WL), non-woody legumes (NWL), agricultural by-products (AGBP) and grasses, and by-product feeds such as rice bran and wheat bran were studied. Animals used were crossbred (Flemish Giant x New Zealand White) or pure New Zealand White rabbits. The roles of fiber on the bioavailability of nutrients and their relationships to the inherent characteristics of tropical plants were also studied. Composition, palatability and digestibility of nutrients of the forages were dependent on the species of plants, but were generally highest in the WL and poorest in grasses. Feeding leucaena and sesbania (WL group) produced the highest bodyweight gain (BWG) and efficiency of feed utilization (FCR) among the forage species. The combination of leucaena with papaya leaves or elephant grass improved BWG by 43 and 58 % and FCR by 7 and 17 %, respectively. The rate of depression of forage quality was dependent on the drying temperature and the forage species. Calliandra and leucaena, which have the highest tannin contents, underwent the most severe reduction in their nutrient digestibility. Inclusion of rice bran up to 60 % in the diet produced comparable growth performance with the control diet. Supplementation of micro and macro nutrients to the rice bran in the forage-feeding system improved growth significantly. The rate of depression of nutrient digestibility by the indigestible ADF content differed between nutrients or between forage species. Poorest nutrient digestion of grasses is associated with their high content of indigestible fiber, which is related to the properties of plants with the C-4 photosynthetic pathways. The reproductive and growth performance of rabbits fed a 16 % crude protein (CP) alfalfa-wheat bran diet were comparable to those receiving 21 % CP containing soybean meal. In conclusion, this study indicates that a simple diet of forages and grain-milling by-products, with no cereal grain and protein supplements, can be converted into high quality meat through rabbit production. The findings in this study can be applied to Indonesian conditions, and probably other tropical areas, for the selection of feedstuffs which will maximize the efficiency of small scale rabbit production under village conditions.
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file details RaharjoYonoCahyanto1987.pdf 2017-08-22 公开 下载