COMPARATIVE EVALUATION BETWEEN THE KUDZU HAY (Pueraria phaseoloides) AND THE Centrosema macrocarpum HAY IN CHEMICAL AND NUTRITIONAL PARAMETERS.
I was measured, in comparative form, chemical and nutritional aspects of Kudzu hay and Centrosema macrocarpum hay (varieties 5062 and 5434) harvested at the age of 4.5 months of sprout. With a simple reversion design, four commercial young bulls Zebu were used per treatment (Kudzu, TK and C. macrocarpum, TC) with an average weight of 313 kg. The animals were managed under confinement in individual stockyard, with food suppy ad libitum. The relationship leaf/stem of the offered material in TK and TC was of 0.456 and 0.448, respectively. The chemical composition did not significantly differ among the materials, with averages to the leaf and stem of 22.4 and 8.9%; 69.9 and 80.0%; 0.98 and 0.57%; 0.22 and 0.16%; and 4.35 and 0.15% for the brute protein, neutral fraction detergent, calcicum, phosphorus and tannins, respectively. The TK showed higher values of digestible energy than TC (1.93 and 1.78 Mcal/kg MS, P≤0.07) and metabolizable energy (1.64 and 1.49 Mcal/kg MS, P≤0.04). The consumption of dry matter, brute protein and brute energy was higher for TC with values of 36.8 and 49.0 g (P≤0.02), 4.84 and 5.97 g (P≤0.01), and 176.0 and 214.0 Kcal/kg 0.75/day (P≤0.03) for TK and TC, respectively. There was not difference (P≤0.41) in the consumption of digestible energy (x̄= 73 Kcal/kg 0.75/day) and metabolizable energy (x̄= 60 Kcal/kg 0.75/day). The apparent digestibility in vivo of the dry matter and energy of TK and TC was of 41.8 and 39.2% (P≤0.01), respectively. On the other hand, there was not difference (P≥0.93) in the apparent digestibility in vitro of the protein (x̄= 51.7%). The solubility of N in buffer of borate/phosphate and in pepsin were very simmilar between legumes, with average for the leaf and the stem of 15.1 and 33.6%, and 68.0 and 65.7%, respectively. The rate of degradation in situ of the dry matter and brute protein of TK was of 0.045 and 0.057%/hour and of TC was of 0.049 and 0.050%/hour, respectively. The ruminant pattern of pH, N-NH3 and volatile fatty acids were very similar between legumes, with averages of 6.76, 26.5 mg/100 ml and 58.8, 18.4, and 17.3% for the acetic, propionic and butyric acids, respectively. It is concluded that in chemical and nutritional terms there were not significant differences between the hays of both legumes and that these showed energetic limitations.
| Main Authors: | , , |
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| Format: | Digital revista |
| Language: | spa |
| Published: |
Instituto de Innovación Agropecuaria de Panamá
1995
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| Online Access: | http://www.revistacienciaagropecuaria.ac.pa/index.php/ciencia-agropecuaria/article/view/475 |
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| Summary: | I was measured, in comparative form, chemical and nutritional aspects of Kudzu hay and Centrosema macrocarpum hay (varieties 5062 and 5434) harvested at the age of 4.5 months of sprout. With a simple reversion design, four commercial young bulls Zebu were used per treatment (Kudzu, TK and C. macrocarpum, TC) with an average weight of 313 kg. The animals were managed under confinement in individual stockyard, with food suppy ad libitum. The relationship leaf/stem of the offered material in TK and TC was of 0.456 and 0.448, respectively. The chemical composition did not significantly differ among the materials, with averages to the leaf and stem of 22.4 and 8.9%; 69.9 and 80.0%; 0.98 and 0.57%; 0.22 and 0.16%; and 4.35 and 0.15% for the brute protein, neutral fraction detergent, calcicum, phosphorus and tannins, respectively. The TK showed higher values of digestible energy than TC (1.93 and 1.78 Mcal/kg MS, P≤0.07) and metabolizable energy (1.64 and 1.49 Mcal/kg MS, P≤0.04). The consumption of dry matter, brute protein and brute energy was higher for TC with values of 36.8 and 49.0 g (P≤0.02), 4.84 and 5.97 g (P≤0.01), and 176.0 and 214.0 Kcal/kg 0.75/day (P≤0.03) for TK and TC, respectively. There was not difference (P≤0.41) in the consumption of digestible energy (x̄= 73 Kcal/kg 0.75/day) and metabolizable energy (x̄= 60 Kcal/kg 0.75/day). The apparent digestibility in vivo of the dry matter and energy of TK and TC was of 41.8 and 39.2% (P≤0.01), respectively. On the other hand, there was not difference (P≥0.93) in the apparent digestibility in vitro of the protein (x̄= 51.7%). The solubility of N in buffer of borate/phosphate and in pepsin were very simmilar between legumes, with average for the leaf and the stem of 15.1 and 33.6%, and 68.0 and 65.7%, respectively. The rate of degradation in situ of the dry matter and brute protein of TK was of 0.045 and 0.057%/hour and of TC was of 0.049 and 0.050%/hour, respectively. The ruminant pattern of pH, N-NH3 and volatile fatty acids were very similar between legumes, with averages of 6.76, 26.5 mg/100 ml and 58.8, 18.4, and 17.3% for the acetic, propionic and butyric acids, respectively. It is concluded that in chemical and nutritional terms there were not significant differences between the hays of both legumes and that these showed energetic limitations. |
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