한우의 체중과 체척치에 대한 일반능력

양영훈,오봉국,이문연,이득환 ( Y . H . Yang,B . K . Ohh,M . Y . Lee,D . H . Lee ) 한국축산학회 1990 한국축산학회지 Vol.32 No.11

The purpose of this paper is to investigate the performances of the body weights and the 11 body measurements of Hanwoo raised between 1987 and 1989 in farms and Hanwoo progeny test center. The body weights at birth, 6, 12, 18 and 24 months of age were 22.49kg, 148.18kg, 223.48kg, 267.76kg, and 291.77kg respectively. The body measurements were increased rapidly up to about 6 months of along with the body weight. Feeding managements and the nursing capacity of dam were considered important. factors to develop the body size of a calf early growing stage. As compared with the previous reports, for the body weights at 6 and 12 months of age and the measurements for body length, chest girth, and shank circumference at 6, 12 and 18 months of age were somewhat increased. This might be come from the improved feeding managements and the change of growth type by selection. The hipbones width(pinbones width), which had not been reported, at birth, 6, 12, 18 and 24 months of age were 8.96cm, 19.09cm, 19.26cm, 21.04cm, and 22.19cm respectively. The body measurements of 11 traits of male calves at 7 months of age shown to be similar to those of female calves at 12 months of age.

산란계종에 있어서 산란곡선의 유전적 모수추정과 이용에 관한 연구

양영훈,오봉국 ( Y . H . Yang,B . K . Ohh ) 한국축산학회 1985 한국축산학회지 Vol.27 No.8

These studies were carried out to estimate the parameters of egg production curve of McMillan Model (1970 a, b) and to try genetic analysis of the parameters and some other parameters, and finally to investigate the usefulness of egg production curve. A total of 477 hen records from one strain (A1, 1977; A2, 1978) of S. C. White Leghorn at College of Agri., Seoul National Univ, and 388 hen records from two strains (C, D, 1975) of Rhode Island Red at Dejon Branch Farm, National Animal Breeding Experimental Station were used in these studies. The parameters of egg production curves in all from fitting the model to mean egg production on monthly time scale were from 29.45 to 36.04 for the potential maximum monthly egg production, from 1.226 to 2.918 for the rate of increase, from 4.773 to 5.563 for the initial month of egg laying, from 0.023 to 0.053 for the rate of decrease. Heritability estinates of the parameters from combined sire and dam variance components in the whole population were 0.18 for the potential maximum monthly egg production, 0.11 for the rate of increase, 0.29 for the rate of decrease, 0.28 for the initial month of egg laying, 0.31 for the peak production, 0.46 for the total egg production (from the day of first egg to 36kws). Genetic correlations were 0.23 between rate of increase and rate of decrease, 0.60 between rate of increase and initial month of egg laying. There were high positive genetic correlation (0.80%) between peak production and total egg production. Comparisons of egg productions by extending production periods through egg production models were interesting.

종모우모형에서 직접법과 반복법의 해의 비교

양영훈,오봉국,이득환 ( Y . H . Yang,B . K . Ohh,D . H . Lee ) 한국축산학회 1990 한국축산학회지 Vol.32 No.11

For the evaluation of breeding values of animals, A trial to get solutions from the Iterative(SUR: Successive underrelaxation method) and the G-inverse was carried out using a sire model with 76 levels of 7 independent factors in this study. The results showed no differences between the solutions from directive(G-inverse) method and that from iterative method. For the four(0.1, 0.2, 0.3, 0.35) different relaxation factors(W) to speed up the convergence to the final solution, even though the number of rounds of interaction was affected, there were no differences in the final solutions. The numbers of rounds of iteration t get final solutions from a restriction({ b₁^n+1 - b₁} $lt;0.0001) under for the 0.1, 0.2, 0.3 and 035 relaxation factors were 1729. 928, 649 and 563 rounds respectively. It is the good iteration parameter(w) whether the convergence is speeded up or not. Since Iterative method is very simple to be programized and needs relatively small computer memory, it could be useful for solving large and complex equations in animal evaluation.

부화시 체중 및 정강이 길이가 꿩의 육성기 체중에 미치는 영향

양영훈,이현종,김규일,김준,김대철,Yang, Y.H.,Lee, H.J.,Kim, K.I.,Kim, J.,Kim, D.C. 한국가금학회 1995 韓國家禽學會誌 Vol.22 No.1

A total of 514 birds were used to investigate the influence of body weight and shank length at hatch on the body weights at various ages in growing pheasant. Statistical model included the terms of hatch and sex as fixed effects and the two covariates of body weight and shank length at hatch. In this model, the effects of hatch and sex on the body weights at the age of 4, 8, 12, 16 and 20 wk, and the average daily gains from hatch to 8 wk and from 8 to 16 wk of age were highly significant(P<0.01). All the regression coefficients of body weights and average daily gains on the body weight at hatch were also significant(P<0.01). Their estimates were 3.05.7.21. 13.89, 15.18 and 15.33 for the body weights at 4. 8, 12, 16 and 20 wk of age ; 0.111 and 0.142 for the average daily gains from hatch to 8 wk, and from 8 to 16 wk of age, respectively. On the shank length, only the regression coefficients of the body weights at 4 and 8 wk of age and the average daily gains from hatch to 8 wk of age were significant(P<0.01). Results of this study suggest that body weight at hatch do significantly affect the body weights in the growing periods up to' the 20 wk of age, but the shank length at hatch influences the body weights only at early age.1)

육성기 꿩의 주령별 체중과 정강이 길이의 측정치에 나타나는 부화차순과 성별의 효과

양영훈,김준,Yang, Y.H.,Kim, J. 한국가금학회 1993 韓國家禽學會誌 Vol.20 No.4

육성기 꿩의 체중과 정강이 길이의 측정치에 나타나는 부화차순과 성별의 효과를 조사하고자 개체별 20주령까지 측정된 육성기 꿩에 대한 분석을 한 결과 다음과 같았다. 육성기 암꿩의 체중은 부화시, 4, 8, 12, 16 및 20주령에서 각각 17.9, 96.0, 296.4, 563.4, 709.0 및 757.4g 이었으며, 수꿩은 주령별 각각 18.3, 104.4, 349.1, 728.5, 1001.4 및 1101.6g 으로 나타났다. 부화차순의 환경효과은 일반적으로 정강이 길이보다 체중에 더 많이 영향을 미치는 것으로 나타났으며, 체중과 정강이 길이에 대한 성별효과는 부화시에는 없었으나(P>0.05), 그 후 사육주령이 경과할수록 뚜렷하게 나타났다. 암수에 따른 성별의 차이는 부화시를 제외하고 4, 8, 12, 16 및 20주령에서 체중과 정강이 길이 모두 유의차(P<0.05)를 보여주었고, 부화시에 차이가 없었던 체중이 20주령에서는 수꿩의 암꿩에 비해 약 344g 이나 더 무거웠다. 정강이 길이의 성장은 암수 모두 16주령까지 거의 완성되는 것으로 나타났다. The objective of this study was to investigate the effects of hatch and sex on the body weight and shank length of growing pheasant. Least squares means of body weight at the age of 0, 4, 8, 12, 16 and 20 wks were 17.9, 96.0, 296.4, 563.4, 709.0 and 757.4 g for female, and 18.3, 104.4, 349.1, 728.5, 1001.4 and 1101.6 g for male, respectively. The hatch effect on body weight was significant at the age of 4, 8, 12 and 16 wks (P<0.05), but the effects on shank length were significant at the age of birth and 8 wks only. There was no significant hatch effect on both the body weight and shank length at the age of 20 wks(P>0.05). Least squares mean differences between female and male were significant(P<0.01) over all wks of age except at hatch.

육성기 꿩의 주령별 체중과 정강이 길이의 상관과 회귀

양영훈,김준,Yang, Y.H.,Kim, J. 한국가금학회 1993 韓國家禽學會誌 Vol.20 No.4

육성기 꿩의 주령별 체중과 정강이 길이에 관한 상호관계를 조사하고, 조기 체중과 정강이 길이가 종꿩으로의 최종 선발주령인 20주령의 체중에 대한 회귀분석 결과 다음과 같았다. 부화시부터 20주령까지 성장기 꿩의 동일주령에서 체중과 정강이 길이는 암꿩에서 0.50~0.83, 수꿩에서 0.57~0.85의 정의 상관관계(P<0.01)를 보여주고 있었으며, 부화시 체중은 4, 8 및 12주령의 체중과는 상관관계가 인정되지 못했으나 (P>0.05), 부화시 체중과 16 및 20주령 체중과의 상관계수는 암컷에서 0.44(P<0.01) 및 0.44(P<0.01)로, 수컷에서는 각각 0.32(P<0.05) 및 0.30(P<0.05)로 성장말기 체중과 정의 상관관계로 나타나고 있었으나, 부화시 정강이 길이와 20주령의 체중 사이에는 암수 모두에서 상관관계가 인정되지 않았다(P>0.05). 20주령의 체중에 대한 조기 측정치(12주령 이전)들의 회귀모형들을 검토한 바, 부화시와 12주령시 측정치를 포함한 모형 ($R^2$=0.96), 8주령과 12주령시 측정치를 포함한 모형($R^2$=0.96), 또는 부화시, 8주령 및 12주령시 측정치를 이용한 모형($R^2$=0.97)으로 평가하는 것이 좋을 것으로 사료되었다. The objective of this study was to investigate the correlation among the measurements of the body weight and shank length at the age of 0, 4, 8, 12, 16 and 20 wk, and to investigate the regression of the final body weight at the age of 20 wk in selection on the body weight and shank length before 12 wk of age. From the simple correlation analysis, the range of correlation coefficients between body weight and shank length at the same age were 0.50~0.83 from females, and 0.57~0.85 from males over all wk of age(P<0.01). Correlation coefficient between the body weights at hatch and 20 wk of age was 0.44(P<0.01), but it was not significant(P>0.05) between the shank length at hatch and body weight at 20 wk of age. The favorable regression models for the estimation of the body weight at the age of 20 wk from both body weight and shank length before 12 wk of age were the models with the independent variables of measurements at hatch and 12 wk of age($R^2$=0.96), with the measurements at 8 and 12 wk of age($R^2$=0.96), and with the measurements at 0, 8 and 12 wk of age ($R^2$=0.96).

제주도내 대기업목장 육우생산축군에 (肉牛生産畜群) 있어서 유전적변이와 개량에 관한 연구 2 . Aberdeen Angus 품종과 Charolais 품종의 체중과 일당증체량에 대한 종모우의 후대능력 상상차

양영훈(Y . H . Yang),정창조(C . J . Jung),김영호(Y . H . Kim) 한국축산학회 1991 한국축산학회지 Vol.33 No.8

These studies were carried out to investigate the genetic merits of sires for the body weight and average daily gain in Angus and Charolais males of a ranch in Cheju Island. A total of 853(Angus, 505; Charolais, 348) heads of calves born from 1985 to 1989 was used for analyses. Results are as follows: Predicted difference values for the progeny body weight of sires at birth. 6, 12 and 18 months of age were the ranges of -1.58∼+1.24, -2.94∼+3.52, -10.66∼+15.25 and -20.04∼+14.65㎏ in Angus, respectively, and the range of -1.42∼+1.94, -4.63∼+3.50, -29.05∼+12.86 and -12.40∼+8.57㎏ in Charolais, respectively. Predicted difference values for the progeny average lifetime daily weight gain of sires at ages of 6, 12 and 18 months were the ranges of -0.021∼+0.031, -0.028∼+0.042 and -0.034∼+0.024㎏ in Angus, respectively, and the ranges of -0.014∼+0.012, -0.072∼+0.034 and -0.026∼+0.020㎏ in Charolais. respectively, Coefficients of the simple and rank correlations of sire PD values between body weights and daily weights gains were estimated to be 0.88∼0.99 and 0.91∼1.00 at various ages. These results appeared to show that the selection for body weight by sire PL) could also contribute to increase genetically average daily weight gain. By selecting all sires with positive sign of PD value for the body weight, body weights of offsprings at 12 to 18 months of age were expected to be increased by 1.1∼2.0 percent of mean body weight in Angus, and to be increased by 1.6∼2.5 percent of mean body weight in charolais. Daily weight gains of offsprings from sires selected by the genetic merits shown in their progeny body weights at ages of 12 to 18 months are expected to be also increased by 1.0∼2.5 percent of mean average daily gain in Angus, and 1.7∼2.4 percent in Charolais.

한우의 체중과 체척치간의 (體尺値間) 상호관계에 대한 연구

양영훈(Y . H . Yang),오봉국(B . K . Ohh) 한국축산학회 1989 한국축산학회지 Vol.31 No.12

This study was carried out to investigate the relationship between body weight and body measurements. A total of 8440 records of Korean Native Beef Cattle(HAN-WOO) was used. Correlation coefficients between the body weight and the body measurements of 11 traits were showed the range of 0.72∼0.94. At the final step of the stepwise regression analysis on body weight with body measurements, all traits of body measurements cexcept chest depth were included in the model, and the determinant coefficient(R²) was 0.91.

한우의 체중과 흉위 및 전관위에 대한 육종가 추정에 관한 연구

양영훈(Y . H . Yang),오봉국(B . K . Ohh) 한국축산학회 1990 한국축산학회지 Vol.32 No.12

This study was carried out to investigate the genetic variation and the expected breeding values for future progeny of Hanwoo(Korean Native Cattle) under the sire and the animal individual models. For the animal models, the breeding values of the sires and dams without records and the progeny with records were estimated simultaneously through the relationship among animals. To estimate breeding values, a total of 2,690 individuals from 8 provinces was evaluated. The results obtained from this study were as follows; The ranges of rank correlation coefficients between the predicted differences from the sire model and the breeding values from animal individual model within the same traits were 0.83∼1.00 for body weight, 0.59∼1.00 for chest girth and 0.62∼1.00 for shank circumference through every months of age. From this result, it was about the same to rank sires either by the predicted difference under sire model or by the breeding value under animal individual model. The ranges of breeding values of body weight, chest girth and shank circumference at 12 to 18 months of age were -25.55∼23.94kg, -9.00∼6.21cm, -1.04∼0.69cm for sire, -30.23∼23.94kg, -11.48∼6.13cm, -0.71∼0.84cm for dam, -57.78∼37.14kg, -18.63∼11.59cm, -1.10∼1.04cm for progeny respectively. The range of breeding values for dam and progeny showed room for individual selection to produce superior bulls and heifers. Rank correlation coefficients of breeding values for total individuals(sire, dam, progeny) evaluated through every months of age were 0.64∼0.79 between body weight and chest girth, 0.32∼0.64 between body weight and shank circumference, and 0.29∼0.65 between chest girth and shank circumference. From this result, we can expect genetic gains simultaneously for the chest girth and shank circumference indirectly if we select the individuals by the breeding values for the body weights. When select for the sires and dams of 10 heads each by the rank of the breeding values for the body weight, It appeared that the genetic improvements of body weight for the next generation from the means of estimated breeding values would be 13.3∼15.5kg at 12∼18 months of age. From selection on body weight, the chest girth and shank circumference were also expected to be increased indirectly about 1.6∼2.8cm and 0.1∼0.2cm at 12 to 18 months of age.

인공점등사육 꿩집단에 있어서 난중이 부화체중 및 20주령 선발체중에 미치는 영향

양영훈(Y . H . Yang),이현종(H . J . Lee),김규일(K . I . Kim),김문철(M . C . Kim) 한국축산학회 1996 한국축산학회지 Vol.38 No.1

To determine the effect of the hatching egg weight on the newly hatched chick weight and the body weight at 20 wks, body weights were analysed with a linear model which had the fixed effects of the hate-time and the sex, and a covariable of hatching egg weight. The correlation coefficient between hatching egg weight and 1-d old chick weight was 0.83(p$lt;0.01), and between hatching egg weight and the body weight at the age of 20 wks was 0.17(p$lt;0.01). Hatch-time effects on the body weight at 1-d and the body weight at 20 wks were significant(p$lt;0.01) but the sex effect on the day old chick weight was not significant(p$gt;0.05). Estimates of the regression coefficients of the body weight at 1-d and the body weight at 20 wks were 0.69±0.02 (p$lt;0.01) and 11.24±1.70 (p$lt;0.01), respectively. These results showed that the hatching egg weight affected the body weight of newly hatched chick and the body weight at 20 wks.