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Articles by T.P. Wang
Total Records ( 2 ) for T.P. Wang
  Lanyasunya , T.P. Wang , H. Rong , E.A. Mukisira , S.A. Abdulrazak and N.K. Kibitok
  An In vitro gas production study was conducted to determine the effect of age and soil treatments on fermentation characteristics of Sorghum almum, Commelina benghalensis and Vicia villosa Roth. The soil treatments were: T1-not fertilized and T2 received DAP fertilizer. Forage samples used were obtained from herbage materials harvested at 6, 8, 10, 12 and 14 weeks of growth. Dry samples (65 C for 24 h, 200 mg DM) of the harvested materials, were incubated in glass syringes with rumen fluid obtained from 2 Friesian steers fitted with permanent fistula. The gas volumes were recorded at 0, 4, 6, 12, 24, 36, 48, 72, 96 and 120 h and the data fitted to the model P = a + b (1e-ct) after correction with blanks using in vitro gas fit-curve program. Forage chemical analyses were done according to standard procedures. The resulting data was analyzed using SAS. Results showed that nutrient composition of this forage, varied with both age at harvest and treatment. The overall means of the fermentation fractions (b) and (a + b) in T2 were higher than in T1 (p< 0.01) across the 3 forages. Strong correlation was observed between chemical composition and gas production. Pattern of gas production was strongly influenced by both treatment and age at harvest. It was therefore, concluded that, age at harvest, negatively affected rumen fermentation of these forages. Application of fertilizer improved in vitro gas production, suggesting enhanced fermentation.
  Lanyasunya , T.P. Wang , H. Rong , A.L. Chek , E.A. Mukisira and S.A. Abdulrazak
  This study was conducted in Naivasha, Kenya over a period of 15 weeks to determine the effect of maturity on mineral content in Commelina benghalensis (Giant var M). Immediately after field preparation, representative soil samples were taken for mineral profiling. Thereafter, 60 plots of 2x2 sq. m size were demarcated and allotted to 5 similar blocks of 12 plots each in a randomized complete block design. Each plot received a total of 50 vines (15 cm long with 3 nodes each) evenly planted in 5 rows (2 m length and 30 cm apart). All the plots were planted on the same day and kept weed free throughout the study. The forage was harvested at 6, 8, 10, 12 and 14 weeks after planting (excluding the 1st 7 days considered as rooting period) in sequential manner beginning with block 1 to 5, each time leaving a stubble height of 5 cm. From each plot, representative herbage grabs were made, chopped into 2 cm pieces and mixed thoroughly. Two composite samples of about 1 kg each were then taken for dry matter determination and mineral analysis through the standard procedures. Results showed wide variations in the plant tissue concentration change patterns of different mineral elements over the study period. From the results, it was noted that P and Mg levels recorded a marginal decline of 0.6 and 13.8% respectively between 6 and 14 weeks. This represented decline rates of 8.93 and 7.14 mg kg -1 DM d -1. On the contrary, K registered a 31.39% increase from 6.18 at 6 to 8.12% at 14 weeks. Sodium and Ca recorded 35.19 and 49.78% drop in concentration over the same period. The level of Cu was fairly consistent throughout the study. That of Mn was observed to be inconsistent. Zinc levels however showed rapid decline 66.68% over the study period. From the results presented it was concluded that, macro-mineral content in Commelina benghalensis significantly decreased with advancing age of the forage. Trace elements, though were not significantly affected by age, their concentration occurred in quantities below ruminant livestock requirements suggesting the need for trace mineral supplementation. It was further concluded that, owing to high macro-mineral content, the giant Commelina benghalensis has a potential for enhancing the levels of essential minerals in the diets of ruminant livestock on smallholder farms in Kenya.
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