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Articles by D.Y. Feng
Total Records ( 4 ) for D.Y. Feng
  W.G. Xia , A.Y. Abdullahi , J.J. Zuo , L. Chen and D.Y. Feng
  Nine hundred, 42 days old male yellow-feathered broilers were used to evaluate the effects of Creatine Monohydrate (CMH) on growth performance, carcass characteristics and meat quality. The birds received either a no-CMH diet (0 mg kg-1) a low (250 mg kg-1), a moderate (500 mg kg-1) or a high-CMH diet (1000 mg kg-1) for 21 days. CMH supplementation did not affect the average daily weight gain, average daily feed intake or feed efficiency. Additionally no significant differences were discovered in the dressing, eviscerated, breast muscle or thigh muscle percentage. However, there was a decreasing trend in the pH values of the pectoralis major at 24 h postmortem and of the thigh muscle at 45 min postmortem as the level of CMH supplementation increased. No significant difference was observed in cooking loss, shear force value, moisture or crude protein percentages. However, supplementing with CMH increased the slow-twitch red and the fast-twitch white fiber ratio in the gastrocnemius muscles. The results suggested that CMH supplementation has no effect on growth performance or carcass characteristics but it potentially triggered a transition from fast-twitch red muscle fibers to slow-twitch red and fast-twitch white muscle fibers.
  J.J. Zuo , W.G. Xia , J.H. Liu , A.Y. Abdullahi , L. Chen , M.H. Xia and D.Y. Feng
  The object of the study was to investigate the effects of Creatine Monohydrate (CMH) supplementation on glucose absorption, glucose oxidation and glycogen synthesis in skeletal muscle of broilers. Nine hundred, 42 days old broilers were randomly assigned to four treatments with five replicates per treatment and 45 birds per replicate. The birds received either a no-CMH diet (0 mg kg-1), a low (250 mg kg-1), a moderate (500 mg kg-1) or a high-CMH diet (1000 mg kg-1) for 21 days. The results showed that CMH supplementation did not affect serum glucose concentration but did increase lactate concentration (linear and quadratic, p<0.001) as CMH supplementation increased. The concentration of lactate in pectoralis major showed a quadratic effect (p = 0.036) in response to increasing CMH supplementation. For the thigh muscle, the concentration of lactate presented a decreasing effect (linear, p = 0.042). Pyruvic acid in the pectoralis major increased markedly (linear, p<0.004; quadratic, p<0.003) with increasing CMH comcentration but an opposite effect to that in the thigh muscle. The HK1 mRNA abundance in the pectoralis major was decreased by CMH supplementation (linear and quadratic, p<0.001) but the HK1 mRNA abundance in the thigh muscle was increased with a quadratic effect. CMH supplementation had increased Lactate Dehydrogenase (LDH) activity in pectoralis major (linear, p = 0.003; quadratic, p<0.001) while no significant effect on thigh muscle as CMH concentration increased. Thus, it was inferred that CMH supplementation may improve glucose oxidation with distribution difference in skeletal muscle. Additionally, CMH supplementation had no effect on the Glycogen Synthase (GYS), Glucose Transporter 1 (GLUT1) and Glucose Transporter 3 (GLUT3) mRNA abundance, macroglycogen or total glycogen concentration of the breast and thigh muscles. CMH supplementation significantly increased the AMPKα phosphorylation of the pectoralis major and demonstrated a quadratic effect (p = 0.002) as CMH supplementation increased. CMH supplement did not affect the AMPKα phosphorylation of the thigh muscle but presented the same effect as the pectoralis major. The results suggested that CMH supplementation did not affect glucose uptake and glycogen storage of skeletal muscle but it accelerate the glucose oxidation in the thigh muscle or decelerate glycolysis in the pectoralis major, possibly regulated by AMPKα phosphorylation.
  J.J. Zuo , A.H. Guo , X.Y. Yan , M. Xu , W.G. Xia and D.Y. Feng
  The objective of this study was to assess the effects of commercial β-mannanase enzyme supplementation in low-energy corn-soybean meal diets on performance, intestinal morphology and mRNA expression of intestinal tight junction proteins in 1-21 days broiler chickens. The 1800, 1 day old broiler chicks were divided into 5 treatment groups, 6 pens in each treatment. The study was performed in a randomised complete block design. The 5 treatments were Positive diet Group (PG) with basal energy level, Negative diet Group (NG) with lower energy of 502.08 kJ kg-1 and other groups supplemented with 150, 300 and 450 mg kg-1 β-mannanase based on NG. Decrease of energy in NG resulted in loss of the Average Daily Gain (ADG) (p<0.05) and Feed Conversion Ratio (FCR) (p<0.05). Based on the NG, supplementation with β-mannanase in diet significantly improved the Average Daily Gain (ADG) (p<0.05) and Feed Conversion Ratio (FCR) (p<0.05) of birds. ADG of groups with enzyme and lower energy reached to the level of PG. Supplementation with 300 g ton-1 β-mannanase increased the villus height of the small intestine (p<0.05) and 450 g ton-1 β-mannanase significantly decreased the crypt depth (p<0.01). The addition of β-mannanase at 150, 300 and 450 g ton-1 to the diets increased the ratio of crypt depth to villus height of the duodenum and jejunum in birds (p<0.01). The ratio of crypt depth to villus height of the ileum was also increased with 300 and 450 g ton-1 β-mannanase supplementation compared to the low-energy diet group (p<0.01). Chicks fed diet with the β-mannanase showed an increased mRNA expression of ZO-1 in the duodenum compared with the low energy diet (p<0.05). Supplementation with 300 and 450 g ton-1 β-mannanase to the diets enhanced the mRNA expression of Occludin and ZO-1 in the jejunum (p<0.05) and 300 g ton-1 β-mannanase increased enhanced the mRNA expression of Occludin and ZO-1 in the ileum (p<0.05). Thus, the addition of β-mannanase to low energy diets improved the performance, gut morphology and mRNA expression of intestinal tight junction proteins.
  A.Y. Abdullahi , J.J. Zuo , H.Z. Tan , W.G. Xia , S. Wei , J.H. Liu , Q. Ai , S.Y. Zhao , M.H. Xia , Y.H. Liu , C.D. Xia , F. Wu , J.P. Yu and D.Y. Feng
  Six hundred and forty, 1 day old Yellow feather broiler chicks were fed wheat-corn soybean diet plus xylanase ENOLZYMETM 100 g ton-1 (enzyme activity = 1256.244 U mL-1) to study additive effect of the enzyme on serum glucose and IGF-1 concentration relative to performance. The birds were randomly divided into 2 treatment groups with 64 birds/pen in 5 replicates. For the periods of 63 days body weight, feed efficiency and daily feed intake were not differed at 21 and 42 days. However, they were all differ significantly at 63 days (p<0.05); particularly feed efficiency from 1-63 days was highly significant (p<0.01). Carcass characteristics were not differed in all three stages but at finishing stage breast and thigh muscles, heart, gizzard and abdominal fat weights were numerically increased. Mortality rate was <0.02%. Serum glucose concentration levels at three feeding phases were not differed among groups. However, serum IGF-1 differ significantly at starter phase (21 days) (p<0.05). Correlation between treatments and feeding periods existed at growing (42 days) and finishing (63 days) stages (p<0.05). The present findings on supplementation of xylanase to corn wheat soy bean broiler diet hasincreased market weight cost value by 1.33% at finishing stage (43-63 days). The serum glucose and IGF-1 concentration have correlated positively on treatments offered, feeding periods and performance. Further research is needed on IGF-1 and GH (Growth Hormone) at molecular level to understand their influence in broiler’s growth and development.
 
 
 
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