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Immunomodulating activities of prebiotics-producing lactic acid bacteria strains
Seoyoung Jeong,Chaeeun Lee,Ayeon Kwon,Young-Seo Park 한국식품영양과학회 2021 한국식품영양과학회 학술대회발표집 Vol.2021 No.10
Prebiotics serve as nutrients for probiotics and strengthen the probiotic properties. The probiotic properties and immunomodulating activities of three prebiotics-producing lactic acid bacteria strains, Leuconostoc lactis CCK940, L. lactis SBC001, and Weissella cibaria YRK005, were investigated. Three strains survived in acid and bile acid environments as well as produced antioxidants. All strains showed high adhesion abilities to human colon cancer cell line, HT-29. Three strains had no cytotoxicity against RAW264.7 macrophages at the cell number ratio of bacteria to macrophages (MOI) of 100. When macrophages were treated with three strains, the production of nitric oxide increased in concentration-dependent manner. When macrophages were treated with three strains, the mRNA expression levels of TNF-α in macrophages increased and those of iNOS were similar to those in LPS-treated cells at MOI 100, which were identified by qPCR. The expression of P38, ERK, and JNK, which identified by western blot, increased in macrophages treated with strains CCK940 and SBC001. These results indicated that three strains showed high immunostimulating activities through MAPKs signaling pathway.
( Seoyoung Jeon ),( Mingyung Lee ),( Jakyeom Seo ),( Jeong-hoon Kim ),( Dong-Keun Kam ),( Seongwon Seo ) 한국축산학회 2021 한국축산학회지 Vol.63 No.5
Recently, a high level of dietary crude protein (CP) has become of interest as a possible practice to improve the carcass quality of beef cattle, and its level has been increasing in the field. However, there is little scientific evidence that supports this. This study was conducted to test whether a high dietary CP level would improve growth performance, body metabolism, and carcass traits in Hanwoo beef cattle. A total of 32 Hanwoo finishing beef cattle (18 multiparous cows, six heifers, and eight steers) participated in a 12-weeks feeding trial. Two kinds of total mixed rations were prepared to contain two different CP; 156 g/kg for the control (CON) and 173 g/kg of CP for the treatment (HCP), while maintaining a similar level of metabolizable energy. The experiment was ended when more than half of the steers reached the target body weight (730 kg). Blood was collected at the end of the experiment. After harvesting, the carcass trait was evaluated at the slaughterhouse according to Korean standards. The carcass yield score and grade were also calculated based on revised criteria. Overall, dry matter intake, average daily gain, blood metabolites concentration, and the carcass traits, except for backfat thickness and the yield score, did not differ between the treatments. The HCP had lower backfat thickness than those of CON. There was no difference in the carcass yield grade, but the yield score was higher in the HCP treatment. According to the newly revised carcass grading criteria, both yield score and grade were higher in HCP than in CON. Increasing CP supply decreased the carcass’s backfat thickness without altering growth performance and body metabolism, resulting in improved yield score and grade. Therefore, feeding a high CP diet may be beneficial in the farm income, although it may also increase feed cost and nitrogen excretion to the environment.
Effects of tannin supplementation on growth performance and methane emissions of Hanwoo beef cows
Jeong, Sinyong,Lee, Mingyung,Jeon, Seoyoung,Kang, Yujin,Kang, Heejin,Seo, Seongwon 충남대학교 농업과학연구소 2019 Korean Journal of Agricultural Science Vol.45 No.3
The objective of this study was to investigate the effects of dietary hydrolysable tannin on growth performance and methane emissions of Hanwoo beef cows. Fifteen cows participated in a seven-week experiment. The cows were stratified by initial methane emissions and assigned to one of two treatments: Control and tannin supplementation. Commercial hydrolysable tannin was top-dressed to a concentrate mix at 3 g/kg based on the dry matter. Enteric methane production was measured for 4 consecutive days at 1 week before and 1, 3 and 7 weeks after the initiation of the experiment using a laser methane detector. The feed intake was measured daily during the methane measurement periods and an additional two days prior to each measurement. The body weight of the cows was measured every 4 weeks. Hydrolysable tannin had no effect (p > 0.05) on body weight, average daily gain, dry matter intake (DMI) and feed conversion ratio. After one week, the methane emission of the tannin supplementation group was 3.66 ppm-m / kg DMI, which was about 3.4% lower (p = 0.078) than that of the control group; however, this tendency disappeared at 3 weeks after the start of the experiment (p > 0.05). The results of this study show that hydrolysable tannin supplementation can reduce enteric methane emissions for a limited period in Hanwoo beef cows. More research, however, is needed to determine the optimal level of hydrolysable tannin supplementation to reduce enteric methane emissions for a longer period without adversely affecting the animal performance of Hanwoo beef cattle.