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정지택(J. T. Jeong),최영석(Y. S. Choi),이진규(J. K. Lee),최정석(J. S. Choi),정영철(Y. C. Jung),정종현(J. H. Jung),최양일(Y. I. Choi) 충북대학교 동물생명과학연구소 2016 동물생명과학연구 Vol.8 No.-
This study was conducted to compare the quality characteristics of pork loin from crossbred combination in pigs. The crossbred combination were Y×Y, YL×Y, YL×D and YL×L(L:Landrace, Y:Yorkshire, D:Duroc). In the proximate composition, the moisture content of YL×D was higher compared with the other crossbred combination. The fat content of YL×Y was significantly higher compared with the other crossbred combination(p<0.05). There ware no significantly difference in share force, WHC, dip loss and cooking loss. The lightness (L<SUP>*</SUP>) value of YL×Y was significantly higher compare with the other crossbred combination(p<0.05). The redness (a<SUP>*</SUP>) values of Y×Y was higher compared with the other crossbred combination. In sensory characteristics, the juiciness, tenderness, flavor and overall acceptability of YL×D were higher compared with the other crossbred combination. As results, it is considered that this information about crossbred combination pigs would be used as a basic data for improvement of pork quality.
김낙환(N . H . Kim),김성훈(S . H . Kim),정영철(Y . C . Jung),박영일(Y . I . Park) 한국축산학회 1992 한국축산학회지 Vol.34 No.3
The data from 3,366 litters of pigs farrowed from November. 1988 to April, 1991 at J Swine Breeding Farm in Icheon, Kyunggi Province were statistically analysed by least squares method to compare the reproductive performance of eight different crosses, D × YL, D × LY, D × DYL. D × DLY, Y × DYL., Y × DLY, Y × L and L × Y. The 3-breed crosses, D × YL and D × LY had the best performance in the number born alive per litter and in the number suckled per litter. Y × DLY, D × YL and D × LY had the largest number born per litter. Of the multiple crosses produced by the 3-breed cross females, D × DYL, Y × DLY and Y × DYL had relatively good performance. The number of stilborn pig per litter was largest in Y × DLY.
정영철(Y . C . Jung),김성훈(S . H . Kim) 한국축산학회 1991 한국축산학회지 Vol.33 No.1
A sample of 3 breed crossed marketing hogs (Duroc × Landrace × Large White, n=133) was evaluated and measured for marbling score of loin eye muscle and the average backfat thickness. The average marbling score was 2.30 and the average backfat thickness was 3.20cm. The effect of sire was close to statistically significant to the marbling score (P$lt;.06) and it was significant to the backfat thickness (P$lt;.01). The effects of dam within sire, sex and age were not significant to both of marbling score and backfat thickness, The heritabilities for marbling score and backfat thickness were 0.37±0.19 and 1.12±0.58, respectively. The genetic correlation between marbling score and backfat thickness was 0.18.
정영철 ( Y . C . Jung ) 한국축산학회 1990 한국축산학회지 Vol.32 No.12
Selection emphasis on reducing subcutaneous fat has long been in pork production. It has been successful to reducing the fat layer around the pig meat, however, it also has reduced intramuscular fat as well. For those countries exporting pork, it is important to keep a higher degree of marbling in pork. Higher fat content in the loin eye muscle favorably influences the palatability of the cooked meat. Measuring the degree of marbling is subjective, while assessing fat content by chemical method is objective. However, measuring marbling can be a method to estimate the total fat content in porcine longissimus since the genetic correlation between two traits is high. Heritabililties of marbling and fat content in the longissimus are moderate and high, respectively. The strategy of breeding program to select for the highly marbled porcine longissimus muscle is to perform simple selection of animals with a high degree of marbling. New technologies are being developed and on trial to measure the degree of marbling in live animals.
돼지의 성장형태에 관한 연구 Ⅰ. 특정병원균부재 ( SPF ) 돼지의 성장형태
정영철(Y . C . Jung),김성훈(S . H . Kim),정정수(C . S . Chung),박영일(Y . I . Park) 한국축산학회 1989 한국축산학회지 Vol.31 No.11
Growth curves and average daily gain were estimated on the basis of the data from 70 primary SPF, and 238 secondary SPF pigs composed of Large White and Landrace breeds. The results of this study are as follows: l. The measurements of live weight have shown the typical sigmoid curves cmmon in primary and secondary SPF pigs. 2. The estimated growth curves of primary SPF Large White were loge W = 7.9368 -5 .53 × 10^-5D²- 4.9922 loge D + 0.90758(loge D)²(R²=0.972) and loge W = 0.227 + 0.05126 D - 1.955 ×10^-4D² + 2.5 × 10^-7D²(R²=0.984) for males and females respectively, and those of Landrace were loge W = -2.610 + 9.68 × 10^-5D²- 4.0 × 10^-7D³ + 1.2508 loge D(R² = 0.989) and loge W = 0.14886 + 0.0584 D - 2.72 × 10^-4D² + 4.7 × l0^-7D³(R²=0.988) for males and females. respectively. Those of secondary SPF Large White were W = 7.993 - 0.3428D + 0.01206D² - 3.75 X 10^-5 D³(R²=0.970) and W = 5.0253 - 0.1888D + 0.010291D²- 3.43 × 10^-5D³ (R² = 0.973) for males and females respectively, and W = 1.8349 + 0.007559D² - 2.346 × 10^-5D³(R² = 0.959) and W = 2.7623 + 0.007695D² - 2.56 × 10^-5D³(R² = 0.949) for Landrace males and females respectively. 3. The peak weight spurt of daily gain occured earlier and of lesser magnitude in female Pigs than male Pigs. 4. Average daily gain of secondary SPF pigs(0.684kg) from 21 days old to 154 days old was higher than that of primary pigs(0.618kg) significantly. Average daily gain of males(0.678kg) was also higher than that of females(0.624kg). However, there was not significant average daily gain difference between two breeds, although it was shown that interaction exist between breeds and different SPF types. 5. The peak weight spurts in primary SPF Large White were 1.019kg(occured at 130.0 days of age and 67.l㎏ of live wt.) and 0.824㎏(123.9days, 57.5㎏) for males and females respectively, and those of Landrace were 1.013㎏(132.7days, 72.5㎏) and 0.780㎏(112.4 days, 51.6㎏) for males and females, respectively. Those in secondary SPF pigs were 0.950㎏(107.2 days, 63.6㎏)and 0.840㎏(100.0days, 54.75㎏) for Large White males and females and 0.810㎏(107.3days, 59.86㎏) and 0.771㎏(100.2days, 54.27㎏) for Landrace males and females, respectively.
정영철(Y . C . Jung),김광주(G . J . Jeon),김성훈(S . H . Kim),박홍양(H . Y . Park),박영일(Y . I . Park),(M . F . Rothschild) 한국축산학회 1992 한국축산학회지 Vol.34 No.1
An animal model with the best linear unbiased prediction properties was used to evaluate the genetic trend of a Landrace herd. The Landrace base population was imported from Sweden and has been closed and linebred for 7 generations. The average number of parental animals per generation were 45 gilts and 15 boars and a total of 1,402 pigs were tested for performance. An average inbreeding coefficient of the 7th generation was 6.19%. The animal model used in the study included a complete additive genetic relationship matrix among all the pigs. The phenotypic trends for days to 90 ㎏ (DAYS 90), average daily gain (ADG), feed conversion rate (FCR). and selection index (INDEX) showed a favorable increase except backfat thickness (BF), but the increase was statistically insignificant. However, the genetic trends for the 5 traits were statistically highly significant (P$lt;0.01). The annual genetic gains with corresponding S.E. were .95±.14 days (.62%) for DAYS90, 9.97±1.73g (1.16%) for ADG, .008±.002㎝ (.56%) for BF, .003±.001% (.11%) for FCR, and 1.65±.14 (.95%) for INDEX, respectively. The values in the parentheses are the corresponding ratio of annual genetic change to phenotypic means.