• Journal of Animal Science and Technology
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• 제50권1호
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• pp.33-44
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• 2008

본 연구는 (사)한국종축개량협회에서 1999년부터 2005년까지 농장검정한 Landrace종, Yorkshire종 2개 품종 111,169두의 번식자료를 이용하여 조사 분석하였다.품종 및 환경요인의 효과 추정은 사용된 모든 품종을 통합하여 분석하였으며, 육종가 및 유전모수의 추정은 1산차의 자료를 이용하여 분석하였으며, 혈통이 없는 자료는 분석에서 제외하였다. 자료의 표준화를 위해 총산자수의 표준편차 3배가 넘는 자료는 제거하였다.품종의 효과에서는 총산자수, 생시 생존 자돈수 및 총 사고두수에 대해 Yorkshire종이 각각 11.57±0.107두, 10.69±0.099두 및 0.88±0.041두로 나타났고, Landrace종이 각각 11.06±0.108두, 10.29±0.100두 및 0.77±0.042두로 나타나 모든 형질에서 Yorkshire종이 Landrace종보다 유의적으로 높게 나타났다.유전력은 총산자수 0.246, 생시 생존 자돈수 0.256, 총 사고두수 0.141로 나타났다. 또한, 유전상관과 표현형상관에서는 총산자수와 생시 생존 자돈수 간에 각각 0.958, 0.925로 모두 높은 정의상관을 나타내었고, 총산자수와 총 사고두수는 각각 0.194, 0.379로 정의상관을 보였으며, 생시 생존 자돈수와 총 사고두수는 각각 －0.089, －0.002로 모두 낮은 부의 상관을 보였다.총산자수와 생시 생존 자돈수의 유전적 및 표현형 개량 정도에서 자돈등기가 시작된 2001년 이전에는 일정한 경향을 보이지 않다가 2001년 이후부터 증가하는 경향을 보였으며, 총 사고두수는 감소하는 경향을 보였다.이상의 연구결과를 통해 농장검정돈의 번식능력을 파악할 수 있었고, 유전적 및 표현형 변화추세로 미루어 볼 때 (사)종축개량협회에서 2001년부터 실시한 자돈등기로 인해 번식성적의 정확도가 높아졌다고 추정 할 수 있다. 그러나 유전력이 다소 높게 나타난 것은 분만성적이 우수하지 못한 초산차의 성적을 이용하였고, 번식기록 및 혈통관리가 농장별로 일정한 기준이 없어 정확한 결과를 나타내지 못한 것으로 사료된다. 본 연구결과를 바탕으로 하여 검정농가의 산자능력에 대한 폭넓은 연구가 가능할 것으로 사료된다.

• Asian-Australasian Journal of Animal Sciences
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• 제17권2호
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• pp.179-182
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• 2004

The polymorphism of the locus FSHRB in intron6-Exon7 of FSHR gene was investigated by PCR-RFLPs in Erhualian, Large White and Landrace${\times}$Large White; The association of polymorphism and litter size was analyzed by using SAS. The results showed that 1) the polymorphism of the locus FSHRB was significantly associated with litter size; 2) the total born number (TBN) and number born alive (NBA) of the sows with BB genotype were increased (p<0.05) with additive effects of 1.02-1.42 and 1.04-1.27 pigs per litter, respectively; 3) among the sows with genotype AA, AB or BB, there was an insignificant difference in born weight and weaning weight. This gene may be an effective potential tool used in conjunction with traditional selection methods.

• 한국산학기술학회논문지
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• 제20권6호
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• pp.514-520
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• 2019

근친에 따른 개체의 능력저하 현상은 다양한 식물과 동물에서 밝혀져 왔다. 재래돼지는 국내 유일 품종이며 소규모 집단으로 유지되고 있어 국가차원에서 중요한 유전자원이다. 본 연구의 목적은 총산자수와 생존산자수에 대한 근교계수, 유전모수 및 근친퇴화 효과를 분석하는 것이다. 국립축산과학원에서 보유한 재래돼지 혈통 2,806두와 483개(1~5산차)의 번식성적을 보유한 모돈 303두의 자료를 활용하였다. 각 형질에 대한 유전모수 추정 후 혼합모형으로 근교계수에 대한 근친퇴화 효과를 분석하였다. 유전모수 추정결과, 총산자수와 생존산자수는 고도의 유전력을 유지하였다. 근교계수는 1998년에서 2017~2018년까지 꾸준히 증가하였으나, 각 형질에 대해 1998년 대비 2017~2018년의 능력감소는 확인되지 않았다. 근교계수 증가에 따라 총산자수의 유의적인 근친퇴화(p=0.03)가 확인되었지만, 생존산자수에서는 유의적인 근친퇴화가 없었다(p=0.41). 또한 두 형질 모두 근교계수와 육종가의 긍정적 상호작용이 확인되었다(p<0.05). 본 연구 결과, 재래돼지 산자수에 대한 근친퇴화 효과가 일부 확인되었지만, 세대가 지남에 따라 명확한 표현형 감소는 확인되지 않았다. 이는 현재까지 높은 유전효과로 근친퇴화를 극복할 수 있음을 시사한다.

• Journal of Animal Science and Technology
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• 제44권4호
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• pp.377-382
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• 2002

본 연구는 1995년부터 2001년까지 한국종축개량협회가 전국 종돈장으로부터 수집한 Land- race, Yorkshire 및 Duroc의 등지방 두께, 일당증체량, 90kg 도달일령, 등심단면적, 정육률, 총산자수 및 복당생존자돈수에 대해 유전적 그룹을 통한 품종효과의 추정과 유전능력 평가를 위하여 96,842두의 산육능력성적과 90,396복의 산자능력자료를 분석하였다. 추정된 품종효과들은 각 품종의 특징을 보여주는데 Landrace는 등지방, 정육률 및 총산자수에서 우수하였고, Yorkshire는 정육률, 등심단면적, 총산자수 및 복당생존자돈수에서 좋은 결과를 보여주었으며, Duroc은 90kg 도달일령과 일당증체량에서는 우수하였지만 가식부위를 결정하는 등지방두께와 정육률, 번시능력을 보여주는 산자수에서 다른 품종에 뒤지는 것으로 나타났다. 유전적 그룹을 통한 품종효과의 추정으로 품종별로 능력평가를 하는 노력을 절감할 수 있고 또한 F1 잡종돈이 포함되어도 평가할 수 있다.

• Journal of Animal Science and Technology
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• 제66권2호
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• pp.366-373
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• 2024

This study aims to estimate the connectedness rating (CR) of Korean swine breeding herds. Using 104,380 performance and 83,200 reproduction records from three swine breeds (Yorkshire, Landrace and Duroc), the CR was estimated for two traits: average daily gain (ADG) and number born alive (NBA) in eight breeding herds in the Republic of Korea (hereafter, Korea). The average CR for ADG in the Yorkshire breed ranges from 1.32% to 28.5% depending on the farm. The average CR for NBA in the Yorkshire herd ranges from 0% to 12.79%. A total of 60% of Yorkshire and Duroc herds satisfied the preconditions suggested for genetic evaluation among the herds. The precondition for the genetic evaluation of CR for ADG, as a productive trait, was higher than 3% and that of NBA, as a reproductive trait, was higher than 1.5%. The ADG in the Yorkshire herds showed the highest average CR. However, the average CR of ADG in the Landrace herds was lower than the criterion of the precondition. The prediction error variance of the difference (PEVD) was employed to assess the validation of the CR, as PEVDs exhibit fluctuations that are coupled with the CR across the herds. A certain degree of connectedness is essential to estimate breeding value comparisons between pig herds. This study suggests that it is possible to evaluate the genetic performance together for ADG and NBA in the Yorkshire herds since the preconditions were satisfied for these four herds. It is also possible to perform a joint genetic analysis of the ADG records of all Duroc herds since the preconditions were also satisfied. This study provides new insight into understanding the genetic connectedness of Korean pig breeding herds. CR could be utilized to accelerate the genetic progress of Korean pig breeding herds.

• Asian-Australasian Journal of Animal Sciences
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• 제15권2호
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• pp.179-183
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• 2002

The fragment in intron I of FSH-${\beta}$ gene was amplified by PCR. According to the polymorphism, we analyzed the distribution of FSH-${\beta}$ retroposon in different pig breeds; its inheritance pattern in Large White${\times}$Meishan reference family; and the association of FSH-${\beta}$ retroposon with litter size, female reproductive organs measurement, ultrasonic backfat and other traits. The results showed that almost each Chinese indigenous pig had the retroposon, while foreign pig breeds rarely had; the frequencies of porcine FSH-${\beta}$ retroposon were strongly associated with breeds (p<0.01); the pattern of inheritance was consistent with Mendelian fashion; total number born (TNB) and number born alive (NBA) were increased per FSH-${\beta}$ retroposon (p<0.01) with additive effects of 1.2-1.8 and 1.4-1.8 pigs/litter, respectively; between the FSH-${\beta}$ retroposon carriers and non-carriers, there was an insignificant difference in the measurement of female reproductive organs, body weight at birth, backfat thickness, loin meat height, lean meat percentage, teat number, days to 100 kg, and average daily gain.

• 한국가축번식학회지
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• 제24권2호
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• pp.209-216
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• 2000

본 연구는 1996년부터 1999년까지 다비 AI 센타에서 사육되는 종모돈 199두와 종빈돈 4,181두를 가지고 종모돈의 정액생산과 번식성적에 미치는 품종, 연령, 계절, 산차 및 교배방법의 영향을 구명하고자 실시한 바, 그 얻어진 결과는 다음과 같았다. 1. 정액량은 Landrace (L) 종이 266.8 $m\ell$로 제일 많았고, Yorkshire (Y) 종이 그 다음으로 많았으며, Duroc (D) 종이 제일 적었다. 정자 운동성은 품종간에 차이가 없었다. 정자농도는 Landrace 종이 4.7$\times$109 sperm/$m\ell$로 제일 낮았고, 정액량이 제일적은 Duroc 종이 5.7$\times$$10^{9}$ sperm/$m\ell$ 로 제일 높았다. 종모돈의 연령에 따른 정액량은 2세 때가 213.3 $m\ell$로 제일 많았고, 4, 3 그리고 l 세의 순서로 정액량이 감소하였다. 2. 종모돈의 계절에 따른 정액량은 겨울철이 228.6 $m\ell$로 제 일 많았고, 가을, 여름, 봄의 순서로 정액량이 감소하였다. 정자농도는 봄철이 5.9$\times$109 sperm/$m\ell$로 제일 높았으며, 여름, 겨울, 그리고 가을의 순서로 낮았다. 3. 교배방법에 따른 복당 생시체중은 품종간 처리구간에 차이점을 인정할 수 없었으나 복당 출생시 생존수에 있어서는 자연종부후 인공수정을 실시한 처리구에서 9.5두로 제일 많았으며, 인공수정을 실시한 처리구에서는 9.2두, 그리고 자연종부를 실시한 처리구에서는 8.9두로 처리구간에 유의성 (P＜0.01)이 인정되었다. 4. 교배그룹간에서는 L (우)$\times$Y (♂) 교배조합과 L (♀)$\times$L (♂) 교배조합이 Y (♀)$\times$ L (♂) 교배조합 Y (♀)$\times$Y (♂) 교배조합보다 복당 생시체중이 무거웠으며, 복당 출생시 생존 자돈수에 있어서도 비슷한 경향을 나타내었다. 자연종부와 인공수정간에 복당 생시체중과 복당 출생시 생존자돈수는 유의차가 없었다. 5. 산차간에 있어서는 2~6 산차의 복당 생시체중과 복당 출생시 생존 자돈수가 각각 13.5 kg 과 9.5 두로 1산차와 7~9 산차에 비하여 우수하였다.

• Asian-Australasian Journal of Animal Sciences
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• 제23권8호
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• pp.1080-1088
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• 2010

This experiment was conducted to investigate the effects of dietary energy levels of gestating gilts on physiological parameters and reproductive performance for primiparous sows. A total of 40 F1 gilts (Large White${\times}$Landrace) were allocated to 4 treatments using a completely randomized design (CRD). Four different experimental diets contained 3,165, 3,265 3,365 and 3,465 kcal of ME/kg and each diet was provided to gilts at 2.0 kg/d during gestation. Consequently, energy intake of each treatment of gestating gilts was 6,330, 6,530, 6,730 and 6,930 kcal ME/kg, respectively. During the whole gestation period, body weight, fat mass gain and backfat thickness of gilts were increased in proportion to dietary energy levels (p<0.01). However, estimated protein mass gain of gilts was not affected by dietary energy level (p>0.10). At farrowing, the total number of pigs born per litter did not show any significant difference among treatments. However, the number of pigs born alive per litter in treatment 6,730 kcal ME/d was significantly higher than that of other treatments (p<0.05). Moreover, litter weight at birth was improved as dietary energy level was increased (p<0.05). Feed intake of sows during lactation tended to decrease as dietary energy level of gestation was increased, but litter weight gain was not affected by dietary treatment during the gestation period. Fat content in colostrum was higher as dietary energy level was increased during gestation. The concentration of blood estradiol-$17{\beta}$ was increased and was higher at the first trimester of gestation in 6,730 kcal ME/d treatment compared to other treatments. These results suggested that increased dietary energy level during gestation resulted in higher body weight and backfat thickness of sows. In addition, reproductive performance of the sow, such as litter weight at farrowing and the number of pigs born alive, was improved when 6,730 kcal of ME/d treatment diet was provided. Consequently, the NRC (1998) recommendation of energy for gestating gilts (6,015 to 6,150 kcal of ME/d) should be reevaluated to maximize reproductive performance because recent high-producing sows require much more energy to produce a large litter size and heavier piglets from the first parity.

• 한국임상수의학회지
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• 제34권2호
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• pp.126-131
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• 2017

This study investigated the incidence rate of umbilical hernia (UH) in pig farms and examined the effect of using them as breeding pigs on reproductive traits. The occurrence of UH ranged from 0.1% to 3.0% in pig farms investigated. UH pigs were found in almost all farms except for a single farm in Jeju Island. Spontaneously occurring UH pigs were selected and used for cross breeding tests. UH-related crosses and their progeny showed significant (P < 0.05) differences in gestation period, the numbers of piglets born and alive, and body weights at birth and $21^{st}$ day comparing to those of the control population. UH-related crosses showed longer gestation period, reduced numbers of piglets, and lighter body weights than those from the control population. Interestingly, reduced number of piglets was about one fourth, suggesting that UH inheritance might play a critical role as a lethal gene during embryogenesis. In addition, UH incidence rate in UH-related crosses was significantly (P < 0.05) higher than that in the control except for UH-cross3. However, in the progeny of control cross, a pig also had UH appearance, indicating that porcine UH might be inherited in recessive inheritance mode. Taken together, the results of this study indicate that UH is one of recessively inherited genetic defect that occurs at ordinary times in pig farms, suggesting that the use of UH animals as sire and/or dam may lead to economic losses due to increased gestation period, reduced numbers of piglets born and alive, and lower growth rates after birth of pigs.

• Asian-Australasian Journal of Animal Sciences
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• 제30권3호
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• pp.320-327
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• 2017

Objective: The objective of this research was to estimate genetic correlations between number of piglets born alive in the first parity (NBA1), litter birth weight in the first parity (LTBW1), number of piglets weaned in the first parity (NPW1), litter weaning weight in the first parity (LTWW1), number of piglets born alive from second to last parity (NBA2+), litter birth weight from second to last parity (LTBW2+), number of piglets weaned from second to last parity (NPW2+) and litter weaning weight from second to last parity (LTWW2+), and to identify the percentages of animals (the top 10%, 25%, and 50%) for first parity and sums of second and later parity traits. Methods: The 9,830 records consisted of 2,124 Landrace (L), 724 Yorkshire (Y), 2,650 LY, and 4,332 YL that had their first farrowing between July 1989 and December 2013. The 8-trait animal model included the fixed effects of first farrowing year-season, additive genetic group, heterosis of the sow and the litter, age at first farrowing, and days to weaning (NPW1, LTWW1, NPW2+, and LTWW2+). Random effects were animal and residual. Results: Heritability estimates ranged from $0.08{\pm}0.02$ (NBA1 and NPW1) to $0.29{\pm}0.02$ (NPW2+). Genetic correlations between reproduction traits in the first parity and from second to last parity ranged from $0.17{\pm}0.08$ (LTBW1 and LTBW2+) to $0.67{\pm}0.06$ (LTWW1 and LTWW2+). Phenotypic correlations between reproduction traits in the first parity and from second to last parity were close to zero. Rank correlations between LTWW1 and LTWW2+ estimated breeding value tended to be higher than for other pairs of traits across all replacement percentages. Conclusion: These rank correlations indicated that selecting boars and sows using genetic predictions for first parity reproduction traits would help improve reproduction traits in the second and later parities as well as lifetime productivity in this swine population.