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Articles by C.T. Zheng
Total Records ( 4 ) for C.T. Zheng
  X.F. Yang , Z.Y. Jiang , X.Y. Ma , C.T. Zheng , Y.C. Lin , S.K. Wang , S.Q. Jiang , F. Chen and G.L. Zhou
  The pork industry is dedicating to provide fast-growing pigs with high-grade meat; this study aimed to explore the relationship between dietary energy and growth output. Thirty two individually-penned male Lantang pigs (initially weighed 20.21±0.63 kg) were randomly assigned to one of four dietary treatments, with 4 replicates of 2 pigs each. The Digestive Energy (DE) of T (treatment) 1~4 were 9.24, 11.02, 12.66 and 14.29 MJ kg-1 feed, respectively. Feeding trail was terminated when all pigs within a treatment averaged 60±2 kg b.wt. and all pigs were slaughtered. The feeding time to reach terminal b.wt. were longer in both T1 and T2 in contrast with T3 and T4 (p<0.01). Average daily energy intake increased linearly with dietary energy concentration (p<0.01). Compared with the other three groups, average daily gain (p<0.05) and feed to gain ratio (p<0.05) of T4 were significantly increased and decreased, respectively. Relative contents of major white fat and perinephric fat, as well as adipocyte size of T4 were higher than those of the other groups (p<0.05). These results indicated that increasing dietary energy content improved fat accumulation in Lantang growing pigs possibly through direct deposition of fat in adipocyte. Higher content of dietary energy tend to increase growth rate of the pig, yet the over-deposition of body fat as well as its possible impact on carcass quality and marketing profit need to be further explored.
  A.M. Fouad , Y. Li , W. Chen , D. Ruan , S. Wang , W. Xie , Y.C. Lin and C.T. Zheng
  Objective: Manganese (Mn) is a crucial trace element for poultry nutrition because it has multiple physiological functions. Thus, the main goal of this study was to evaluate the effects of dietary Mn supplementation on laying performance, egg quality and antioxidant status in Shanma laying ducks. Methodology: Five hundred and four Shanma laying ducks, at 17 weeks of age, were randomly assigned to 7 treatments, with 6 replicates per treatment and 12 ducks per replicate. Birds were fed the same basal diet, which was supplemented with 0.0 (control), 15, 30, 45, 60, 75 or 90 mg Mn/kg in the form of Mn-sulfate. Results: Results showed that dietary Mn supplementation did not affect egg production, egg weight, feed conversion ratio, egg mass, egg quality, tibia characteristics, total antioxidant capacity, copper-zinc superoxide dismutase or lipid peroxidation (malondialdehyde), but supplementing 90 mg Mn/kg diet significantly (p<0.05) improved the activities of total superoxide dismutase, Mn-containing superoxide dismutase and increased Mn content in egg yolk compared with the control group. Conclusion: These results indicate that corn-soybean meal diet containing sufficient amount of Mn for laying performance and egg quality in Shanma laying ducks under the conditions of current experiment, but adding 90 mg Mn/kg basal diet is required to improve the activities of Mn-containing superoxide dismutase and total superoxide dismutase and elevate Mn content in their egg yolk.
  A.M. Fouad , W. Chen , D. Ruan , S. Wang , W.G. Xia and C.T. Zheng
  Modern strains of poultry have been produced to meet the demands of consumers in terms of quantity and they are affected by problems associated with immunity (sensitivity to infection with different diseases), stressors (high sensitivity to different stressors) and product quality (meat and egg quality). In particular, heat stress (HS) negatively affects the productive performance, meat yield, egg yield, meat quality (visual appearance and chemical characteristics), egg quality (internal and external), reproductive performance, intestinal functions and immune response. In addition, there is increased awareness among consumers of the quality of food and the industry must aim to satisfy the higher requirements of consumers. Thus, there is increased pressure on poultry producers to improve their production quantity and quality. As a consequence, it is important to know how HS affects the meat quality, egg quality, immune organs, intestinal functions and reproductive organs in order to protect against any negative effects. In addition, it is essential to determine the roles of nutritional factors and the possibility of using them to overcome the negative effects of HS. This review summarizes current research in these areas.
  A.M. Fouad , Y. Li , W. Chen , D. Ruan , S. Wang , W.G. Xie , Y.C. Lin and C.T. Zheng
  This study was designed to investigate the influences of dietary copper (Cu) on laying performance, egg quality, plasma total cholesterol (TC), high-density lipoprotein cholesterol (HDLC) and low density lipoprotein-cholesterol (LDLC) concentrations in Shanma laying ducks. A total of 504 egg laying ducks aged 17 week were randomly allotted to seven groups (twelve ducks per replicate and six replicates each treatment). The control group was fed a corn-soybean meal diet, whereas the treatment groups were fed corn-soybean meal diets supplemented with 4, 8, 12, 16, 20, or 24 mg Cu-sulfate/kg. Egg production, egg weight, egg mass, feed conversion ratio, broken egg rate, abnormal egg rate, Haugh unit, yolk color, albumen height, eggshell weight, eggshell percent, eggshell breaking strength, eggshell thickness, plasma TC, HDLC and LDLC concentrations did not appear response to dietary Cu levels. Our results indicated that corn-soybean meal diet containing sufficient amount of Cu for laying performance and egg quality in laying ducks under the conditions of current experiment. Also, laying performance, plasma TC, HDLC, LDLC concentrations and egg quality were not sensitive traits to low levels of Cu.
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