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Articles by Mohamed El-Sherbiny
Total Records ( 2 ) for Mohamed El-Sherbiny
  Mostafa Sayed Abdellatif Khattab , Salah Abdelmoneim Hassan Abo El-Nor , Ahmed Mahmoud Abdeltawab and Mohamed El-Sherbiny
  Background and Objectives: The growth of the ethanol industry has increased the need for alternatives to corn in lactating cow diets. Glycerol has the potential to replace corn in the diet. Due to high potential fermentation of glycerol in the rumen, the study aimed to investigate the efficiency of encapsulation and nano-dispersed techniques to protect glycerol from ruminal degradation and fermentation. Materials and Methods: The current study was carried out using batch culture technique using 9 treatments as follow: Control diet (50% concentrate: 50% roughage), G20: replacing 20% of corn in control diet with glycerol, G30: replacing 30% of corn in control diet with glycerol, G40: replacing 40% of corn in control diet with glycerol, B20: replacing 20% of corn in control diet with glycerol encapsulated beads, B30: replacing 30% of corn in control diet with glycerol encapsulated beads, B40: replacing 40% of corn in control diet with glycerol encapsulated beads, N20: replacing 20% of corn in control diet with nano-dispersed glycerol solution, N30: replacing 30% of corn in control diet with nano-dispersed glycerol solution and N40: replacing 40% of corn in control diet with nano-dispersed glycerol solution. Results: The results showed a negative effect of using crude glycerol and encapsulated glycerol beads on ruminal digestibility and pH, while using nano-dispersed solution were similar to control diet. Conclusion: It could be concluded that the nano-dispersed glycerol solution might be more effective under rumen condition and fermentation.
  H.H. Azzaz , Mohamed El-Sherbiny , H.A. Murad and H.M. Ebeid
  Pionibacteria are natural inhabitants of the rumen that make up 1.4% of ruminal microflora and produce propionate, a major precursor for glucose production by hepatic gluconeogenesis. Several mechanisms have been suggested for the mode of action of direct-fed bacteria in ruminants include stimulation of desirable microbial growth in the rumen, alteration of ruminal fermentation pattern and end product formation, increasing postruminal nutrient flow, increasing nutrient digestibility and alleviation of stress through enhanced immune response. Propionibacteria have the ability to convert lactic acid and glucose to acetic and propionic acids, reduce the risk of acidosis and increase weight gain and milk production of treated animals. On the other hand, enteric CH4 is the single largest contributing source of greenhouse gases production which causes global warming crisis. Propionibacteria also act to alter the biohydrogenation of polyunsaturated fatty acids in the rumen and increasing the generation of health-promoting fatty acids such as Conjugated Linoleic Acid (CLA). The impact of feeding of propionibacteria on the performance of the ruminant animals has been evaluated but results were inconsistent, this may be attributed to many of factors involved the used bacterial strain and its viability, bacterial inclusion level in the diet, diet composition and frequency of feeding, animal status including age, breed, health and physiological condition. In this review the focus will be on surveying impact of feeding propionibacteria on the productive performance of the ruminants including the effects on nutrients digestibility, rumen activity, blood parameters, milk yield and milk composition.
 
 
 
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