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Articles by V. Muchenje
Total Records ( 2 ) for V. Muchenje
  B. Gunya , V. Muchenje and P.J. Masika
  Objective: This study aimed to investigate the effects of Eisenia foetida (E. foetida) meal on the carcass characteristics and physicochemical attributes of broiler chickens. Materials and Methods: A total of 180, 12 per treatment un-sexed day-old broiler chicks were randomly assigned to five dietary treatments (T) as follows: 0% (EW0), 1% (EW1), 3% (EW3) 5%, (EW5) and 10% (EW10) earthworm meal inclusion. At day 35, carcass characteristics and meat quality were measured. Results: The results revealed the dietary effect on the wing and drumstick yield (p<0.05), however, supplementation of E. foetida meal linearly (p<0.05) reduced wing yield. The gizzard yield was increased linearly (p = 0.05) by worm meal inclusion. In addition, there were dietary treatments effects (p<0.05) on the colour of breast muscles over time. The highest values for L* (lightness) and b* (yellowness) were found in EW5 birds while the highest values for a* (redness) were found in EW1 birds. The pH values were affected (p<0.05) by the dietary treatments at 1h post-mortem with the highest pH values observed in birds in EW3 and EW1. Dietary treatments had a significant influence (p<0.05) on cooking loss; even though, there were no differences (p>0.05) observed on shear force values. The cooking loss increased linearly (p = 0.009) by the inclusion of worm meal. Conclusion: In conclusion, the inclusion of E. foetida meal into diets of broilers had positive effects on carcass characteristics and physicochemical attributes.
  C.E. Oyeagu , V. Mlambo and V. Muchenje
  Background and Objective: Recently, the term “resistant starch” has been increasingly used in the literature to describe starch that escapes digestion in the small intestine together with non-starch polysaccharides. Exogenous enzymes have been employed to ameliorate these challenges. Hence, the optimum performance of Aspergillus xylanase on maize-soy bean meal has not been fully investigated. This study was designed to test the effects of Aspergillus xylanase on apparent nutrient digestibility, protein utilization efficiency, growth performance and size of visceral organs on broilers. Materials and Methods: Three-hundred-day-old mixed sex Cobb 500® chicks were randomly allocated to five dietary treatments with five replicates of 12 birds each. Dietary treatments include, xylanase (XYL) 0 (0 g kg–1), XYL10 (1 g kg–1), XYL15 (1.5 g kg–1), XYL20 (2 g kg–1) and XYL25 (2.5 g kg–1). Results: Results showed that birds fed XYL20 and 25 had higher (p<0.05) crude fiber and dry matter digestibility. Dietary treatment XYL20 promoted the highest (p<0.05) body weight gain (BWG) in the final week. Birds fed XYL20 recorded the best (p<0.05) feed conversion ratio during all phases of the feeding trial and the highest (p<0.05) BWG during the starter phase. Birds fed XYL20 had the highest (p<0.05) values for thigh, breast, wing and carcass yields. Both protein and energy efficiency ratios (PER and EER, respectively) were improved (p<0.05) for birds fed XYL20 during all phases. The small intestine lengths decreased (p<0.05) but spleen weights increased (p<0.05) as Aspergillus xylanase enzyme levels increased. Conclusion: The optimum Aspergillus xylanase inclusion levels that caused the greatest response for all measured parameters was 2 g kg–1.
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