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Articles by H.R. Wang
Total Records ( 2 ) for H.R. Wang
  T.P. Lanyasunya , H.R. Wang , W.O. Ayako and D.M. Kuria
  This study was conducted in Kenya over 15 weeks to determine the effect of manure or fertilizer application on quality of Vicia villosa Roth. After field preparation, 60 plots of 2x2 m2 size were then demarcated and divided into 5 similar units comprising of 4 blocks of 3 plots each and independently allotted to 3 treatments in a Randomized Complete Block (RCB) design. Treatments were: T1-control (No fertilizer), T2 and T3 received beef cattle manure and fertilizer, respectively. All units were planted on the same day and harvested at 6, 8, 10, 12 and 14 weeks, in a sequential manner, starting with unit 1-5. All the blocks in each unit were harvested on the same day and the entire freshly harvested materials (per plot) were weighed. Representative grab samples were collected, chopped to pieces of 2 cm length, mixed and 2 composite samples (500 g each) were then taken for dry matter determination and chemical analysis following standard procedures. Yield of nutrients was also determined. Collected data was stored in MS-Excel and analyzed using SAS. From the results it was observed that, NDF in T1, T2 and T3 increased by 19.7, 14.1 and 19.2% between 6 and 14 weeks, respectively. ANOVA showed that treatment had effect on DMY (r2 = 0.7341; p< 0.01) at 14 weeks but not on CPY (r2 = 0.3705; p>0.05). Mean ME concentration in the forage was not influenced by either manure or fertilizer application. Strong correlation between nutrients and V. villosa age at harvest was observed. It was therefore concluded that, though fertilization had no effect on nutrient content, it improved their overall yield.
  H.R. Wang , M.Z. Wang and L.H. Yu
  The objectives of this study were to investigate how rumen fermentation, microbial community and Microbial Protein (MCP) yields changed with dietary protein. Experiments were conducted using four goats fitted with rumen cannula in a 4x4 Latin square design. Experimental diets were divided into 4 groups according to their nitrogen source, which was feather meal (A), corn gluten meal (B), soybean meal (C) and fish meal (D), respectively. The results showed that the mean pH value of group A and C were high, the reverse was true for group B and D (p<0.05); the change patterns of pH with time differed from each other although, the mean pH value of group A and C (B and D) seemed to be similar. Concentration of NH3-N ranged between 6.77-21.67 mg/100 mL, the lowest average NH3-N concentration (11.08 mg/100 mL) was observed in feather meal supplemental diet (A), while, the highest peak occurred in soybean meal supplemental diet (C) (15.04 mg/100 mL). No significant difference was detected in VFA concentrations among groups, except for valeric acid. Yields of microbial protein also varied with diets; microbial protein of the group C and D were comparatively higher than that of the group A and B (p<0.05); while, bacterial protein yields of group C was significantly higher than that of other 3 groups, protozoa to bacteria ratio was also lowest in group C. Further genetic fingerprint analysis revealed that microbial profile was modified by dietary protein within bacteria or protozoa community. It was concluded that rumen fermentation, microbial profile and rumen microbial protein could be modified properly by dietary protein.
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