• Asian-Australasian Journal of Animal Sciences
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• 제19권3호
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• pp.319-323
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• 2006

Heritabilities and genetic correlations of economic traits were estimated with a multiple-trait animal model on 5 different strains of Korea Native Chickens (KNC): Red Brown (RB), Yellow Brown (YB), Gray Brown (GB), Black (B) and White (W). The data used for this study were collected from the Daejeon branch of the National Livestock Research Institute and included 11,233 performance records and 12,729 individual animals. DFREML and SAS BASE/STAT packages were used to estimate genetic parameters and descriptive statistics. The estimated heritabilities for strain RB, YB, GB, B and W, respectively, for age at 1st egg were 0.24, 0.27, 0.12, 0.32 and 0.18; for body weight at first egg were 0.39, 0.43, 0.38, 0.52 and 0.57; for body weight at age of 270 days were 0.43, 0.51, 0.30, 0.52 and 0.67; for egg weight at first egg were 0.08, 0.13, 0.07, 0.06 and 0.07; for egg weight at age of 270 days were 0.37, 0.43, 0.22, 0.34 and 0.41; and for number of eggs laid by age of 270 days were 0.24, 0.25, 0.37, 0.36 and 0.30. The genetic and phenotypic correlations were also estimated.

• 생명과학회지
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• 제10권4호
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• pp.317-325
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• 2000

A six parent dialled analysis was conducted to get basic information for improving yield of upland cotton. Heterosis, combining ability, genetic components and correlation coefficients for boll length, boll width, boll weight, 100 seed weight, lint weigth per boll and lint percentage were studied. Estimates of heterosis for all characters and heterobeltiosis for boll weight and lint weight per boll showed positive values. In general combining ability effect, 'Muan' and 'Imsung' showed highely positive effect in all characters. In specific combining ability effect, the combinations of 'Seungju${\times}$Imsung$.$Seosan${\times}$Imsung' for bll length, 'Cheju${\times}$Imsung$.$Seung${\times}$Imsung' for boll width, 'Cheju${\times}$Muan$.$Cheju${\times}$Imsung' for boll weight, 'Cheju${\times}$Soonchun$.$Muan${\times}$Imsung' for 100 seed weight, 'Soonchun${\times}$Muan' for lint weight per boll and 'Soonchun${\times}$Seosan$.$Seungju${\times}$Muan' for lint percentage showed highly positive effect. Partial dominance was observed for boll length, boll weight, 100 seed weight and lint weight per boll, complete dominance for boll width and overdominance for lint percentage. The number of effective gene group was estimated as one for all characters. The estimates of narrow and broad sense heritabilities were high for all characters except as one for all characters. The estimates of narrow and broad sense heritabilities were high for all characters except lint percentage. Correlation coefficients among the boll length, boll width, boll weight, 100 seed weight and lint weight per boll were positive, whereas lint percentage was negatively correlated with other characters.

• 한국작물학회지
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• 제28권4호
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• pp.488-496
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• 1983

버어리종 신품종 육성을 위한 기초자료를 얻기 위하여 수량성ㆍ품질 및 내병성을 달리하는 Burley 21등 5품종을 full diallel cross하여 20개 F$_1$을 만들고 양친과 함께 공시하여 초장, 엽수 ; 초장ㆍ폭, 엽면적 및 개화일수 등 주요형질과 수량ㆍ품질에 관하여 유전력, 유전자의 분포상태 및 유전자 작용에 대하여 분석ㆍ검토한 결과를 요약하면 다음과 같다. 1. 8개 형질에 대한 협의와 광의 유전력은 각각 0.1618-0.6914와, 0.7494-0.9537 범위였으며 초장, 개화일수에서 가장 높았고 수량ㆍ품질에서 가장 낮았다. 2. 초장의 유전은 장간이 단간에 대하여 부분우성을 나타냈으며 우성유전자의 관여가 컸고 우성유전자는 increaser로 작용하였다. L8은 열성친으로 다른 4품종은 우성친으로 나타났다. 3. 엽수의 유전에는 상가적 유전자 작용이 컸고 다엽이 소엽에 대하여 부분우성이었으며 모체 품종중에는 우성과 열성유전자가 거의 동수로 분포하는 것으로 추정되었다. 4. 엽장은 장엽이 단엽에 대하여 완전우성 유전을 하는 것으로 추정되며, 엽폭에서는 광엽이 세엽에 대하여 초월우성을 보여 F$_1$의 엽면적 증대를 가져와 수량증가의 요인으로 작용하였다. 5. 개화기 유전은 조성이 만성에 대하여 부분우성으로 상가적 유전자의 작용이 컸고 관여하는 유효인자수는 1-2개 정도였으며 우성유전자는 개화기를 단축시키는 작용을 하였다. 6. 수량은 다수성이 우성인 초월우성유전을 보였으며, 품질은 질량이 우성인 완전우성 유전으로 추정되었다. L8은 두가지 형질에 대하여 열성친으로 나타났으며 4개 품종들은 우성친으로 나타났다.

• 생명과학회지
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• 제8권4호
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• pp.431-436
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• 1998

잎 들깨 품종의 선발을 위하여 들깨 91품종의 집단에서 8개 형질에 대한 유전력 및 유전 상관을 추정하여 잎 들깨 양적 형질의 효율적 선발에 대한 유용한 정보를 얻기 위하여 본 연구를 수행하였던 바 그결과를 요약하면 다음과 같다. 유전력은 엽중, 엽면적, 엽장, 엽폭, 초장, 경직경, 마디수가 0.7311~09112로서 높았고, 1주엽수가 0.3241로서 다소 낮았다. 유전 상관은 엽중과 엽면적, 엽중과 엽장, 엽중과 엽폭, 엽중과 초장, 엽중과 경직성, 초장과 경직경, 초장과 마디수, 경직경과 마디수 사이에서 각각 +로 유의하였다. 모든 형질간의 상관관게어세 유전상관의 값이 표현형 상관의 값보다 높았다.

• 생명과학회지
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• 제10권2호
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• pp.177-181
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• 2000

This study was conducted to estimate the genetic parameters such as combining ability, heritabilities and correlation coefficients forsome agronomic characters by 6$\times$6 dialled crosses of barley. The results obtained were summarized as follows. Mean squares of general combining ability(GCA) and specific combining ability(SCA) were significant for all characters observed. Mean squares of general combining ability for all characters were expressed as higher values than those of specific combining ability. Jecheon #5 showed the high general combining ability effects for culm length, and Waegwanpimack #1 showed the highest general combining ability effects for tiller number. Cygne also showed the high general combining ability effects for spike length and 1,000 grains weight. Furthermore, Plumage was expressed with the highest general combining ability effects for spike length and 1,000 grains weight. Furthermore, Plumage was expressed with the highest general combining ability effects for number of grains per spike. In specific combining ability effects, Samdugjeonbug # 45$\times$Plumage showed the high value for culm length, and Suwon #6 $\times$Waegwanpimack #1$\times$ was expressed with the highest specific combining ability effects for tiller number. Jecheon #5$\times$Plumage also showed the high specific combining ability effects for spike length and number of grains per spike. Suwon #6$\times$Cygne showed the high specific combining ability effects for 1,000 grains weight. The heritabilities of spike length an number of grains per spike were over 90%. In correlation coefficients among characters, relationships between culm length and tiller number, culm length and spike length, culm length and 1,000 grains weight, and spike length and 1,000 grains weight showed highly positively correlation.

• Animal Bioscience
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• 제34권1호
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• pp.20-25
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• 2021

Objective: The objective of the study was to investigate the possibility of utilizing an early litter size trait as an indirect selection trait for longevity and to estimate genetic parameters between sow stayability and litter size at different parities using a linear-threshold model for longevity in Thai Large White (LW) and Landrace (LR) populations. Methods: The data included litter size at first, second, and third parities (NBA1, NBA2, and NBA3) and sow stayability from first to fourth farrowings (STAY14). The data was obtained from 10,794 LR and 9,475 LW sows. Genetic parameters were estimated using the multiple-trait animal model. A linear-threshold model was used in which NBA1, NBA2, and NBA3 were continuous traits, while STAY14 was considered a binary trait. Results: Heritabilities for litter size were low and ranged from 0.01 to 0.06 for both LR and LW breeds. Similarly, heritabilities for stayability were low for both breeds. Genetic associations between litter size and stayability ranged from 0.43 to 0.65 for LR populations and 0.12 to 0.55 for LW populations. The genetic correlation between NBA1 and STAY14 was moderate and in a favorable direction for both LR and LW breeds (0.65 and 0.55, respectively). Conclusion: A linear-threshold model could be utilized to analyze litter size and sow stayability traits. Furthermore, selection for litter size at first parity, which was the genetic trait correlated with longevity, is possible when one attempts to improve lifetime productivity in Thai swine populations.

• Animal Bioscience
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• 제35권3호
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• pp.377-384
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• 2022

Objective: This study was conducted to estimate multi-trait genetic parameters for somatic cell score (SCS), milk yield and type traits in Nigerian Dwarf (ND) goats from the United States. Methods: Data from 1,041 ND goats in the United States with kiddings in 95 herds were used to estimate multi-trait genetic parameters for SCS, milk (MILK), fat (FAT), and protein (PROT) yields, and 14 type traits. An 18-trait mixed linear animal model for lactation mean SCS (Log₂), MILK, FAT, PROT, and 14 type traits was applied. A factor analytic approach (FA1) in ASReml software was used to obtain convergence. Results: Averages for SCS were low (2.85±1.29 Log₂), and were 314±110.6, 20.9±7.4, and 14±4.9 kg, respectively, for MILK, FAT, and PROT. Heritabilities for SCS, MILK, FAT, and PROT were 0.32, 0.16, 0.16, and 0.10, respectively. The highest heritabilities for type traits were for stature (0.72), teat diameter (0.49), and rump width (0.48), and the lowest estimates were for dairyness (0.003) and medial suspensory ligament (0.03). Genetic correlations of SCS with MILK, FAT, and PROT were positive but low (0.25, 0.18, and 0.23, respectively). Genetic and phenotypic correlations between MILK, FAT, and PROT were high and positive (≥0.66). Absolute values of genetic correlations involving SCS with type traits were generally low or no different from zero. Most of the phenotypic correlations involving SCS with type traits were low. No serious unfavorable genetic correlations between milk yield traits and SCS or between milk yield traits or SCS and type traits were found. Conclusion: Genetic variation exists in the ND breed for most studied traits. The development of selection programs based on these estimates may help accelerate favorable multi-trait genetic changes in this breed.

• 한국작물학회지
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• 제27권1호
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• pp.87-93
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• 1982

담배 황색종 품종인 SC72와 Hicks를 교배하여 그 $F_1$잡종식물의 약으로부터 유기한 반수체식물을 배가시켜 얻은 30계통의 10개 양적형질에 대한 변이, 유전력, 유전상관 및 경로계수의 분석에 의하여 각형질들의 유전현상을 본바 그 결과를 요약하면 다음과 같다. 1. 교배친간 각 형질의 변이폭은 1.5~37.8%인데 비하여 반수체배가계통간에는 19.6%~100.1%로 현저히 크게 나타났고 평균치에 있어서는 교배친에 비하여 반수체배가계통들은 nicotine, 수확엽수 및 엽장폭비가 증가하는 경향이나 그외 특성들은 저하되는 경향이었다. 2. 유전력은 개화일수 및 수확엽수는 높게, reducing sugar, kg당 가격 및 수량은 낮게, 그외 형질들은 중간치를 나타내었다. 3. 유전상관의 값은 표현형상관보다 그 값이 다소 높은 경향이었고, 수량은 kg당 가격, 엽폭, 수확엽수 및 reducing sugar와는 정의 상관이었고, nicotine은 엽장폭비를 제외한 타형질과는 부의 상관을 나타내었다. 4. 수량과 각형질간의 경로계수를 분석한 결과 수확엽수와 엽폭이 수량에 미치는 직접효과가 컸으며, 간접효과는 개화일수와 초장이 크게 나타났다.

• Animal Bioscience
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• 제36권12호
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• pp.1785-1795
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• 2023

Objective: This study was to estimate heritabilities, additive genetic correlations, and phenotypic correlations between number of piglets born alive (NBA), litter birth weight (LTBW), number of piglets weaned (NPW) and litter weaning weight (LTWW) in different parities of Landrace (L), Yorkshire (Y), Landrace×Yorkshire (LY), and Yorkshire×Landrace (YL) sows in a commercial swine operation in Northern Thailand. Methods: Two models were utilized, a single trait repeatability model (RM) and a multiple trait animal model (MTM). The RM assumed reproductive records from different parities to be repeated values of the same trait, whereas the MTM assumed these records to be different traits. The two models accounted for the fixed effects of farrowing year-season, genetic group of the sow, heterosis, and age at first farrowing, and the random effects of sow, boar, and residual. Results: Heritability estimates from RM were 0.02±0.01 for NBA, 0.10±0.01 for LTBW, 0.04±0.01 for NPW, and 0.11±0.01 for LTWW. Heritability estimates from MTM fluctuated across parities, ranging from 0.04±0.01 in parity 2 to 0.09±0.02 in parity 4 for NBA, 0.07±0.02 in parity 2 to 0.16±0.02 in parity 3 for LTBW, 0.04±0.02 in parity 4 to 0.08±0.01 in parity 1 for NPW, and 0.16±0.02 in parity 1 to 0.20±0.02 in parity 2 for LTWW. Additive genetic correlation estimates from MTM were also variable, ranging from 0.29±0.24 between NBA in parity 1 and NBA in parity 2 to 0.99±0.05 between LTWW in parity 3 and LTWW in parity 4. Conclusion: The findings of this study highlight the advantage of using MTM for the genetic improvement of reproductive traits in swine and contribute to the development of sustainable swine breeding programs in Thailand.

• Journal of Forest and Environmental Science
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• 제24권1호
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• pp.41-46
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• 2008

전나무 수형목에서 채취한 풍매종자 32가계를 이용하여 1994년 화성과 강릉 식재지에 차대검정림을 조성하였다. 15년생 때 수고, 흉고직경, 재적지수를 조사한 결과 전반적인 생장은 강릉식재지가 화성식재지보다 양호하게 나타났다. 강릉과 화성 식재지에서 생장특성에 대한 분산분석을 한 결과 가계간에는 생장이 양호하였던 강릉에서 모든 특성이 고도의 유의차를 나타냈으나 화성에서는 유의차가 나타나지 않았다. 반복간에는 화성에서 수고생장을 제외한 모든 특성에서 고도의 유의차가 나타났다. 그러나 가계${\times}$반복 상호작용에서는 강릉에서 흉고직경과 재적지수에서만 유의차가 나타나지 않았다. 또한 2개 식재지를 종합분석한 결과는 수고를 제외한 모든 특성에서 지역, 가계간에 고도의 유의차가 인정되었다. 그러나 지역${\times}$가계 상호작용간에는 유의차가 나타나지 않아 강릉과 화성 식재지에서 가계별 생장 양상이 유사한 경향을 보였다. 개체유전력은 강릉에서 수고가 0.485, 흉고직경이 0.611, 재적이 0.538로 나타났으며, 화성에서는 수고가 0.121, 흉고직경이 0.054, 재적이 0.080으로 추정되었다. 2개 식재지를 종합한 유전력은 수고가 0.204, 흉고직경이 0.326, 재적이 0.238로 추정되었다. 또한 모든 특성에서 개체유전력이 0.054~0.611로 가계유전력 0.089~0.723보다 낮게 추정되었다. 개량된 채종원산과 일반산 차대의 생장특성에 대한 실질적인 개량효과를 비교한 결과 선발된 수형목 차대들의 개량효과는 수고 2.5%, 흉고 직경 9.2% 및 재적 23.6%로 추정되었다. 클론의 50%를 선발하면, 즉 생장이 불량한 50%가 채종원에서 유전간벌되면 수고 9.5%, 흉고직경 17.0% 및 재적 46.8%가 개량되는 것으로 추정되었다.