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덖음차 제조중 기계적 첫 비빔시간이 품질에 미치는 영향
한재석(J.S. Han),박장현(J.H. Park),최형국(H.K. Choi),허원녕(W.N. Hou) 한국차학회 1999 한국차학회지 Vol.5 No.1
The contents of moisture of green tea were on the decrease with the prolongation of 1st rolling time, and the yield of green tea at 10 min. rolling time was the highest value of 23.46%. Mineral contents of these mechanical rolling green teas were higher than those hand rolling green teas. All organic compound contents of those except chlorophyll were lower than these. Particularly 10 min. rolling green tea had higher contents of total nitrogen. total amino acid and chlorophyll. and lower content of tannin than the other rolling periods. The content of caffeine wa: not different significantly, but The content of vitamin C went down with the extension of rolling period. Sixteen kinds of free amino acid detected by HPLC had higher contents of theanine, glutamic acid, alanine, tyrosine and total amino acid. The taste-determinants such as theanine, aspartic acid, serine. glutamic acid and arginine in green tea liquor. occupied as much as 83.4~94.2% of T.A.A.s. Among these. theanine was more than 50%. Lightness and yellowness of green tea were increased with delay of rolling time, while green color(redness) appeared to be more distinct at 10 min. rolling time than other treatments. Consequently. these results meant that 10 min. rolling time was considered to be the best rolling time.
Hou, W.X.,Cheng, S.Y.,Liu, S.T.,Shi, B.M.,Shan, A.S. Asian Australasian Association of Animal Productio 2014 Animal Bioscience Vol.27 No.10
This experiment was conducted to investigate the effects of dietary supplementation of magnesium sulfate ($MgSO_4$) during late gestation and lactation on sow and litter performance, fecal moisture, blood biochemistry parameters, immunoglobulin levels and milk composition in sows. Forty-eight sows ($Yorkshire{\times}Landrace$, 4th to 5th parity) were randomly allocated to 1 of 4 dietary treatments supplemented with 0, 200, 400, or 600 mg/kg $MgSO_4$ (n = 12). The experiment started on day 90 of gestation and continued through day 21 of lactation. Blood samples were collected on day 107 of gestation, day 0 (farrowing) and 21 (weaning) of lactation for the analyses of the blood biochemistry parameters and immunoglobulin levels. The colostrum and milk samples were obtained on day 0 and 14 of lactation, respectively. Fecal samples were collected from the sows on day 107 of gestation as well as day 7 and 20 of lactation to determine fecal moisture content. The results showed that the survival percentage of piglets and the litter weight at weaning were decreased linearly (p<0.05) and other parameters of the sow or litter performance were not influenced (p>0.05) by $MgSO_4$ supplementation. The fecal moisture content of the sows were increased (p<0.05) linearly as dietary $MgSO_4$ increased on day 7 and 20 of lactation. Supplementation with $MgSO_4$ increased the plasma magnesium (Mg) level linearly (p<0.05) and had a trend to increase total protein level (p>0.05 and p<0.10). However, an increase in the dietary $MgSO_4$ level resulted in a linear decrease in the colostrum fat content (p<0.05). Dietary $MgSO_4$ supplementation enhanced the immunoglobulin G (IgG) level (linear, p<0.05) in plasma on day of farrowing and immunoglobulin A (IgA) level in colostrum (quadratic, p<0.05) and milk (linear, p<0.05) of the sows. These results indicated that supplementation with $MgSO_4$ during late gestation and lactation may have the potential to prevent sow constipation, but may also result in some negative effects.