Y. H. Moon has completed his PhD in ruminant nutrition at the age of 31 years from GNU in Korea and works in the university as a professor for 20 years. He has published more than 100 papers in reputed journals and has been serving as an editorial board member of repute.
A hundred twenty six Hanwoo steers (8-9 month of age) were used to know the correlation between blood composition and carcass traits. Steers fed the formula feed and rice straw(30 heads) or total mixed rations(96 heads) and were slaughtered at 30 month of age. Blood samples were corrected from jugular vein at the growing(8-12mo), early fattening(13-23mo) and late fattening(24-30mo) phases. Blood metabolites and hormones were analyzed and determined the correlation coefficients and regression equations with carcass traits.Average concentrations of retinol, insulin and leptin were 1.10IU, 30.34ng and 235.35ng per ml of blood plasma, respectively, and blood retinol has negative correlations significantly(P<0.01) with insulin and leptin. With the age of steers, blood insulin and total protein decreased, but blood retinol, AST, glucose, cholesterol and triglyceride were increased. At the late fattening phase, significant(P<0.01) negative correlations occurred between blood retinol concentration and marbling score, and also blood total protein and longissimus muscle area of 13th rib, and obtained the regression equations as follows; Marbling score(1-9) = -0.009×Retinol(IU/100 ml) +9.125(R2 = 0.643) Ribeye muscle area(㎠) = -0.250×AST(U/L)+112.498 (R2 = 0.450) From the results obtained in the current study, it might be possible to make a high marbled beef by control the blood retinol content during the fattening phase in steers.
Vanja completed her Bachelor of Science (Honours) in AnimalBiology with distinctionat the University of Guelph in January 2014. She is currently furthering her knowledge in the field of animal nutrition by pursuing a Master’s degree by thes is under the supervision of Dr. Vern Osborneat the University of Guelph.
Thisprojectis part of alargertaskpursuing thedevelopment of naturallyproduced,health-contributing, polyphenol-enrichedmilkproductsthat are derived from byproductplantmatter from agriculturalsources. Apple pomace (AP), an abundantagricultural by product in Canada has a high polyophenolcontent (1000-1415g gallic acid equivalent/100g dry weight).17,36The objective of thisstudyis to evaluate the effects of in vitrorumendigestion on the totalpolyphenolcontent and free radical scavengingactivity of AP. AP will be collectedfresh andkeptat -20°C untilanalysis. Rumeninoculumwill be collected from a mature lactating cow and in vitrodigestionwill be performedfor 24 and 48hr of digestion in an ANKOM RF Gas Production System as per manufacturer’s instructions.3Afterdigestion, the sampleswill be centrifugedat 26 940g and filteredthrough 0.2um polyethersulfonefilters to removebacterial cells.10Allsamples (treated and untreated) will be freezedried and ground, afterwhichpolyphenolswill be extracted by solventextraction (80% methanolat21°C for 1hr).33 Fast Blue BB assay for totalpolyphenolquantificationand 2,2-diphenyl-1-picrylhydrazyl (DPPH) free radical scavengingactivityassaywill be performed on allsamples in triplicate with 3 technical replicates to assess the extent of polyphenoldegradation in the rumen33.The fraction of polyphenolsremainingafterin vitro digestionwill be roughlyrepresentative of the amountavailablefor absorptioninto the cow’sbloodstream and subsequently the mammarygland.