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Articles by Li Fadi
Total Records ( 4 ) for Li Fadi
  Zheng Chen , Hao Zhengli , Li Fadi , Guo Yanli and Jin Yanmei
  This study was conducted to investigate the effects of adding Mannan-Oligosaccharide (MOS) to different concentrate-to-roughage diets on ruminal fermentation in vitro. A 4x6 two factorial experimental design (the concentrate-to-roughage ratio, 20:80, 30:70, 40:60, 50:50 and the MOS level, 0, 0.4, 0.8, 1.2, 1.6 and 2.0%) was carried out. The gas production technique was adopted and used the 100 mL cultivated bottles, 50 mL graduated syringes and thermostatic water bath pans as in vitro cultivated device. The in vitro incubation continued 24 h and collected samples at 3, 6, 9, 12 and 24 h. Each treatment executed five replicates at each fermentation time. The results showed the gas and methane production were not impacted by concentrate-to-roughage and MOS and the combination of two factors did not influence all items significantly (p>0.05). The In vitro Dry Matter Digestibility (IVDMD) was impacted by concentrate-to-roughage ratio (20:80<40:60, 9 and 12 h, p<0.05, 24 h, p<0.01; 20:80<50:50, 3, 12 and 24 h, p<0.01). The In vitro Crude Protein Digestibility (IVCPD) was affected by both concentrate-to-roughage ratio (20:80>40:60, 3 h, p<0.05; 20:80>50:50, 12 h, p<0.01; 30:70>40:60, 3 h, p<0.01, 6 h, p<0.05; 30:70>50:50, 3 and 12 h, p<0.01; 6 and 9 h, p<0.05) and MOS (0<1.6%, 24 h, p<0.01; 0<2.0%, 24 h, p<0.05). The pH also influenced by concentrate-to-roughage ratio (50:50<20:80, 3, 6, 9 and 12 h, p<0.01; 50:50<30:70, 3, 6 and 12 h, p<0.01; 50:50<40:60, 12 h, p<0.05; 20:80>40:60, 6 and 12 h, p<0.01; 3 and 9 h, p<0.05) and MOS (0>1.6%, 6 and 12 h, p<0.01; 0>2.0%, 6, 12 and 24 h, p<0.05; 0.4>2.0%, 6 h, p<0.05). The NH3-N content was affected by concentrate-to-roughage ratio (50:50<20:80, 3 and 9 h, p<0.05; 50:50<30:70, 12 h, p<0.01) and MOS (2.0>0%, 24 h, p<0.01). The concentrate-to-roughage impacted the ratio of acetic acid to propionic acid (20:80>50:50, p<0.05), acetic acid to TVFAs (20:80>40:60 and 20:80>50:50, p<0.01) and butyric acid to TVFAs (20:80<40:60 and 20:80<50:50, p<0.05). We could find the IVCPD, pH, NH3-N content increased with the reducing of concentrate approximately while opposite to the IVDMD and the IVCPD and NH3-N content increased with the rising of MOS roughly while opposite to pH.
  Zhang Zi-Jun , Ren Chun-Huan , Guo Xiao-Fei , Huang Ya-Feng , Luo Jian-Chuan , Zhao You-Zhang , Li Fadi , Yao Jun , Zhang Xiao-Rong and Ling Ying-Hui
  The Borderdale and Poll Dorset rams were introduced from New Zealand to intercross and improve local sheep breeds in Gansu province in North-West China. The research showed that the F1 lambs have quick speed of live-weight gain, high dressing percentage, high meat yield and with good economic efficiency; their carcasses contain plenty of essential and nonessential amino acids with fresh colour of red and clear fatting strip, ideal rib-eye area and thickness of fat. The results also indicate that Borderdale and Poll Dorset are perfect paternal breeds to improve local sheep breeds in North-West China and necessarily to be extended during lamb production; the Borderdale F1 is better than the Poll Dorset F1 in meat gaining ability, ratio of investment to output and economic efficiency. It is better to fat the male F1 lambs without castration from 5 months old. The high quality of lamb meat that produced in the testing plot is up to the standard of soft food.
  Weng Xiuxiu , Bu Dengpan , Li Fadi , Zhang Yangdong and Wang Dandan
  An experiment was conducted to investigate responses in milk production, milk composition and rumen fermentation of dairy cows receiving a corn straw or mixed forage diet. Ten primiparous and rumen-cannulated Holstein dairy cows averaging 127±13 days in milk (mean±SD) were randomly assigned to CS (37.1% corn straw as sole forage) or MF diet (3.7% Chinese wildrye+28.4% alfalfa hay+26.5% corn silage as mixed forage). Feed intake, body weight, body condition score and milk production were monitored. Milk fat, protein, lactose and total solids were analyzed by near-infrared analysis. Samples of rumen fluid were collected via cannula every 6 h over a 72 h duration to analyze pH, ammonia-N and VFA concentrations. Results showed that cows fed MF diet significantly increased dry matter intake (p<0.01) as well as yields of milk (p<0.05), 4% FCM (p<0.01), milk fat (p<0.05), lactose (p<0.05) and total solids (p<0.05). Cows fed MF diet had higher (p<0.01) ruminal acetate concentrate and ratio of acetate to propionate and lower concentrations of ammonia-N (p<0.01), propionate (p<0.05), butyrate (p<0.01), isobutyrate (p<0.01), valerate (p<0.01) and isovalerate (p<0.01) than cows fed CS diet. Collectively, these results suggest that cows fed MF diet improve DMI and milk production. In addition, cows fed CS diet had minor differences in rumen pH and total VFA concentration which may suggest that corn straw played an important role in maintaining rumen function when cows were fed this higher concentrate diet.
  Zhang Junxia , Zheng Chen , Hou Shengzhen , Li Fadi and Ma Liaowei
  The study was evaluated the effects of dietary energy levels on ruminal fluid parameters in Tibetan ewes. Tibetan ewes with similar weight, age, pregnant period and after delivering were assigned to three dietary treatments (Digestion Energy (DE) levels: 13.00, 13.50, 14.00 MJ kg-1) and pasturing group as control. After 60 days of experimental treatments, 14 sheep were selected rationally and ruminal fluid were collected to determine the content of Volatile Fatty Acid (VFA), pH, the concentrate of ammonia Nitrogen (NH3-N), urea N, protein N and total N of ruminal fluid. The results showed that concentration of TVFAs in ruminal fluid with higher DE than that of control group (p<0.05), meanwhile, TVFA concentration differed at every treatment group (p<0.05). Acetic/propionic, acetic, propionic, delphinic acid of treatments significantly differed with control groups (p<0.05) but no difference between each treatment group, butyric and pentanoic acid were not difference among all groups (p<0.05). Supplemental concentration might improve total N and protein N while different energy level did not affect total N significantly (p>0.05). Compared to pasturing group, the ewes’ supplementations with different energy levels did not significantly affect pH and the relative abundance of total N, NH3-N, urea N and protein N (p>0.05).
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