모돈의 자돈 생산성에 영향을 미치는 요인 분석

정흥우,Wang, L.,Rothschild, M. F. 한국축산학회 1998 한국축산학회지 Vol.40 No.1

Records from 16,351 litters born between 1991 and 1996 from Duroc, Landrace and Yorkshire sows and Landrace × Yorkshire crossbred sows were used to estimate the effects of year, parity and breed on eight sow productive traits at birth. The model used in this study included effects of year, parity, breed, sow nested within breed, and the interactions of year by parity and parity by breed. The results obtained were as follows: Year had highly significant effects (P$lt;0.01) on the numbers of stillbirths, pigs mummified, small pigs, and pigs suckled and litter weight. The breeds of sow significantly affected (P$lt;0.01) the total number of pigs born, the number of stillbirths, small pigs, pigs culled, and pigs suckled and litter weight. The total number of pigs born, the number of pigs suckled and litter weight were the highest in the 4th parity. The number of stillbirths, pigs mummified and small pigs tended to inaease with the inaease of parity. Parity effects were significant on most of the traits. The total number of pigs born and the number of pigs suckled were greater in the crossbred sows than in the purebreds (P$lt;0.01) and litter weight was heavier in the crossbred sows than in the purebreds (P$lt;0.05). In purebreds, Landrace and Yorkshire sows were superior to Duroc sows in the total number of pigs born and the number of pigs suckled (P$lt;0.01). Landrace Yorkshire crossbred sows were similar to Yorkshire Landrace crossbreed in the sow productive traits. Heterosis were 9.3% for the total number of pigs, 11.6% for the number of pigs suckled, 4.3% for litter weight, 25.0% for the number of stillbirth, 23.1% for the number of pigs mummified and 20.0% for the number of pigs culled.

모돈생산능력지수

정흥우,Jeong, Heung-U 대한양돈협회 1995 養豚 Vol.17 No.5

돼지에 있어 복당산자수와 복당포유개시자돈수의 유전력과 유전상관

정흥우,박영일 ( H . W . Chung,Y . I . Park ) 한국축산학회 1986 한국축산학회지 Vol.28 No.9

Data from 351 purebred Large White litters produced by 34 sires were utilized to obtain genetic and phenotypic parameter estimates for the total number of pigs born per litter, the number of pigs born alive per litter and the number of pigs suckled per litter. The heritabilities and genetic and phenotypic correlations were estimated from the sire components of variance and covariance. Heritabilities estimated in this study were 0.10±0.20 for the total number of pigs born per litter, 0.14±0.20 for the number of pigs born alive per litter .and 0.08±0.20 for the number of pigs suckled per litter. The genetic correlations of the total number of pigs born per litter with the number of pigs born alive per litter and the number of pigs suckled per litter were 1.18 and 0.75 respectively, and the genetic correlation between the number of pigs born alive per litter and the number of pigs suckled per litter was 0.83. Phenotypic correlations among the litter traits were highly positive.

자돈의 초기 성장에 관한 연구

정흥우 ( Heung-woo Chung ),최병상 ( Byoung-sang Choi ),문승태 ( Seung-tae Moon ) 한국고등직업교육학회 2003 한국고등직업교육학회논문집 Vol.4 No.4

This study was carried out to investigate the early growth pattern of piglets reared at Y swine farm. Forty-one piglets were weighed daily from birth to 30 days old, and male piglets were castrated at 3 days old, and the piglets were weaned at 20 days old. The traits studied were average daily gain by week from birth to 4 week old and the 3 week weight for piglets were estimated. The results obtained in this study are summarized as follows; 1. Average daily gains for castrated males and females from birth to 20 day old were 0.281±0.0050kg and 0.276±0.0040kg, respectively. 2. The 3 week weight were estimated 7.28kg for castrated males and 7.23kg for female. 3. The growth of piglets was delayed approximately 0.50kg by the stress from weaning.

돼지에 있어 등지방두께에 대한 종모돈 평가에 관한 연구

정흥우(H . W . Chung),박영일(Y . I . Park) 한국축산학회 1990 한국축산학회지 Vol.32 No.12

This study was conducted to estimate the breeding value of sire for backfat thickness in swine by BLUP and least squares method, to estimate the correlations among the breeding values estimated by the two methods and to compare the efficiency of the two methods of estimating the breeding value. The data used in this study were obtained from 5,386 heads of Durocs, Landraces and Yorkshires tested on a weight-constant basis at S. Swine Breeding Farm in Icheon, Kyunggi-Do from August, 1982 to August, 1987. The results obtained in this study are summarized as follows. 1. The correlation between the breeding values of sire estimated by the BLUP and least squares method in male offspring was 0.778 and 0.799, respectively, in Durocs and Yorkshires, and the correlation in female offspring was 0.974 and 0.817, respectively, in the two breeds. These correlations were highly significant. 2. The correlations between the breeding value of sire estimated by the male offspring and the breeding value of the same sire estimated by the female offspring were higher in the BLUP than in the least squares estimates. 3. The BLUP appears to be more efficient than the least squares method in estimating the breeding value in view of the magnitude of the standard errors. 4. Although the BLUP is more efficient than the least squares method in estimating the breeding value, the least squares method may be used for the estimation of breeding value, if G^-1-value is not known correctly or if it is difficult to use the BLUP, in view of the positive and high correlations between the breeding values estimated by the two methods.

돼지에 있어 성장율 , 등지방두께 , 체장 및 체고에 대한 유전모수의 추정

정흥우(H . W . Chung),박영일(Y . I . Park) 한국축산학회 1990 한국축산학회지 Vol.32 No.5

This study was conducted to estimate the heritabilities and genetic and phenotypic correlations among average daily gain, age at 90kg, backfat thickness, body length and wither`s height. The data used for this study were obtained from 5,386 heads of Duroc, Landrace and Yorkshire boars and gifts tested on a weightconstant basis at S Swine Breeding Farm at Icheon, Kyunggi Do from August, 1982 to August, 1987. The results obtained in this study are summarized as follows ; 1. The heritabilities of the traits estimated by sire variance component were 0.259±0.081 for average daily gain, 0.288±0.082 for age at 90kg, 0.409±0.100 for backfat thickness, 0.160±0.064 for body length and 0.201±0.062 for wither`s height, respectively. 2. The genetic correlations of average daily gain with age at 90kg, backfat thickness, body length and wither`s height were -0.765, -0.084, -0.202 and -0.081, respectively. The genetic correlations of age at 90kg with backfat thickness, body length and wither`s height were 0.127, 0.203 and 0.045 respectively. The genetic correlations of backfat thickness with body length and wither`s height were -0.202 and -0.216, respectively and the genetic correlation between body length and wither`s height was 0.334. 3. The phenotypic correlations of average daily gain with age at 90kg, backfat thickness, body length and wither`s height were -0.771, -0.102, -0.048 and-0.032, respectively. The phenotypic correlations of age at 90kg with backfat thickness, body length and wither`s height were 0.133, 0.037 and 0.033.. respectively. The phenotypic correlations of backfat thickness with body length and wither`s height were -0.144 and 0.158, respectively and the estimate of body length with wither`s height was 0.293 in phenotypic correlation.

돼지의 성장율과 등지방 두께에 대한 유전 및 환경요인의 효과

정흥우(H . W . Chung),박영일(Y . I . Park) 한국축산학회 1989 한국축산학회지 Vol.31 No.9

The purpose of this study was to investigate the effect of sex, breed, year of birth, month of birth, parity of sows and litter size on average daily gain, age at 90kg and backfat thickness in swine. The data used in this study were obtained from 7,650 heads of Duroc, Hampshire. Landrace and Yorkshire boars and gilts tested on an age-constant basis at a swine breeding farm in Chungchongbuk-Do from March, 1984 to February, 1987. The results obtained in this study are summarized as follows: l. The least-squares overall means of the traits studied were. 0.780±0.003kg for average daily gain, 155.6±0.3 days for age at 90kg and 1.679±0.008cm for backfat thickness. respectively. 2. Males had significantly higher average daily gain and earlier age at 90kg and thinner backfat than females. 3. Among the breeds compared, the Duroc had the highest average daily gain and reached 90kg at the earliest age. The Hampshire had the thinnest backfat. 4. Year of birth and month of birth affected the three traits studied significantly. The pigs born in June and July had comparatively higher average daily gain and reached 90kg at an earlier age than those born in other months. The pigs born in March and April had lower average daily gain, and the pigs born in December and January had the thinnest backfat. 5. The effect of litter size was statistically significant for none of the three traits studied. 6. The pigs in 2nd parity had the highest average daily gain and reached 90kg at the earliest age. Backfat was thinnest in the 3rd parity.

돼지의 離乳後 形質에 미치는 品種性 및 環境要因의 效果

鄭興又,朴英一,徐康錫 서울대학교농과대학농업개발연구소 1989 서울대농학연구지 Vol.14 No.1

This study was conducted to investigate the effect of breed, sex, year of birth, month of birth, litter size and parity of sow on certain postweaning traits in swine. The data for this study were obtained from 5,386 heads of Duroc, Landrace and Yorkshire boars and gilts tested at a swine breeding farm in Icheon, Kyunggi-Do from August, 1982 to August, 1987. The results obtained in this study are as follow: 1. The least-squares overall means of the traits studied were 0.777±0.002㎏ for average daily gain, 158.7±0.28 days for age at 90㎏, 1.833±0.008㎝ for backfat thickness, 112.2±0.13㎝ for body length and 63.7±0.05㎝ for wither's height, respectively. 2. Among the three breeds compared, the Duroc had the highest average daily gain and reached 90㎏ at an earliest age. The Landrace had the thinnest backfat and longest body length. In wither's height the Duroc was the highest. 3. Males had higher average daily gain, reached 90㎏ at an earlier, age, had thinner backfat, longer body length and higher wither's height than females. 4. Year of birth and month of birth had significant effects on all of the postweaning traits studied. The pigs born in June, July and August had comparatively higher average daily gain and earlier age at 90㎏ than those born in other months. The pigs born in October had the thinnest backfat. 5. the effect of litter size was significant for age at 90㎏ and backfat thickness, but was not significant for average daily gain, body length and wither's hight. The pigs in litter sizes of 5 to 7 reached 90㎏ at an earliest age, and those in litter size of 12 or more reached 90㎏ at a latest age. Backfat was thinnest in the litter size of 4 or less and was thickest in the litter size of 12 or more. 6. The pigs in 2nd 3rd parities had the highest average daily gain and reached 90㎏ at an earliest age, and those in 5th parity was the most inferior in the two traits. Backfat was thinnest in the 1st parity and was thickest in the 5th parity.

항생제 대체 생균제가 자돈의 생산성, 영양소 이용률, 유해가스 발생량 및 분내 미생물 수에 미치는 영향

김종덕,정흥우,심금섭,박승용,주종철,송재준,이경호,박중국,박도연,김창현 한국유기농업학회 2010 韓國有機農業學會誌 Vol.18 No.4

This study was conducted to determine the effect of probiotics as an alternative for antibiotics on growth performance, nutrient digestibility, noxious gas emission and fecal microbial population in growing piglets. A total of 96 piglets (22.5±1.3㎏ average body weight) were allotted to 3 different treatment groups and replicated 4 times with 8 piglets per replicate in randomized complete block design. Treatments were T1) (Control, basal diet+0.2% antibiotics), T2) 0.2% probiotics complex and T3) 0.3% Bacillus probiotics. During the whole experiment period, there were no differences (p>0.05) in average daily gain (ADG), average daily feed intake (ADFI) and feed efficiency. However, digestibility of dry matter, crude protein, ether extract, nitrogen free extract and crude ash were showed higher in probiotics groups (T2 and T3) than those of control. In noxious gas emission, ammonia, amine, hydrogen sulfide and mercaptan were significantly (p

산란계 사료첨가제로서 크릴분말의 효과

김종덕,장재익,유문일,정흥우,권찬호,오두식,김창현 한국국제농업개발학회 2004 韓國國際農業開發學會誌 Vol.16 No.1