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| Author(s): |
Paulo Rossi Junior
Total Authors: 1
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| Document type: | Master's Dissertation |
| Press: | Piracicaba. |
| Institution: | Universidade de São Paulo (USP). Escola Superior de Agricultura Luiz de Queiroz (ESALA/BC) |
| Defense date: | 1994-12-27 |
| Advisor: | Max Lazaro Vieira Bose |
| Abstract | |
Four Bos indicus (Nelore) rumen fistuladed animals, averanging 36 months of age and 520 kg, were used in a randomized block design to study the ruminal degradability of the nitrogen and carbohydrates fractions of corn silage, soybean meal and sorghum grain. The experimental diets consisted of two levels of concentrate (20 and 40%), plus corn silage. The concentrate ingredients used were: soybean meal, cotton seed meal, corn grain and sorghum grain. The nitrogen and carbohydrates fractions were analysed according to "The Cornell net carbohydrates and protein system for evaluating cattle diets" (CNCPS). The nitrogen fractions of corn silage were very similar to those published by the Cornell system. However the starch level estimated in this study was smaller than the values proposed by the CNCPS, probably due to different laboratory methods for determining the starch content in feedstuffs. The degradation rates of the several nitrogen and carbohydrates fractions were similar to the values estimated by the CNCPS system. The diets higher in concentrade (40%) showed a lower rate and extent of degradation for corn silage and soybean meal and higher values for sorghum of compared to the diets lower in concentrate (20%). (AU) | |