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| Registros recuperados: 177 | |
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| 三浦, 伸也; 鈴木, 三義. |
| (社)北海道酪農検定検査協会の検定日記録を用い，体細胞スコアに対する影響要因を明らかにし，遺伝率を推定した．データは北海道酪農検定検査協会により，1991年2月から2003年3月までに集積された初産の869,114頭からの8,986,351の検定日記録，2産は619,883頭（6,370,190記録），3産は409,320頭（4,194,475記録）に関する泌乳量と体細胞スコアである．体細胞スコアの上昇により，乳量，乳成分量は減少を示し，とくにスコア6以上で急激な減少を示した．体細胞スコアの遺伝率は，Wilminkの泌乳曲線を利用した反復率モデルで，初産〜3産まで0.08，0.07，0.07と推定され，産次間での大きな変動は認められなかった．ルシャンドル多項式を利用した変量回帰モデルを用いた遺伝率推定値は，Wilminkの関数により得られたものより高く，とくに分娩直後および，乾乳前において高く推定された．モデル内の次数を2次から5次まで変化させることによる大幅な遺伝率の変化は認められなかったので，計算時間等を考慮すると3次程度が妥当な次数と考えられる．閾値モデルによる推定遺伝率は分析の中ではもっとも高く推定され，その有効性が示唆されたが，これに関してはさらに実用的な見地からの研究が望まれる． |
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Palavras-chave: Somatic cell score; Heritability; Random regression; Threshold model; Holstein. |
| Ano: 2006 |
URL: http://ir.obihiro.ac.jp/dspace/handle/10322/2598 |
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| Maupetit, Agathe; Fabre, Bénédicte; Pétrowski, Jérémy; Andrieux, Axelle; De Mita, Stéphane; Frey, Pascal; Halkett, Fabien; Hayden, Katherine. |
| Crop varieties carrying qualitative resistance to targeted pathogens lead to strong selection pressure on parasites, often resulting in resistance breakdown. It is well known that qualitative resistance breakdowns modify pathogen population structure but few studies have analysed the consequences on their quantitative aggressiveness‐related traits. The aim of this study was to characterize the evolution of these traits following a resistance breakdown in the poplar rust fungus, Melampsora larici‐populina. We based our experiment on three temporal populations sampled just before the breakdown event, immediately after and four years later. First, we quantified phenotypic differences among populations for a set of aggressiveness traits on a universally... |
| Tipo: Text |
Palavras-chave: Disease-associated traits; Heritability; Mixed model; Plant pathogen; Q(ST)-F(ST)comparisons; Temporal sampling. |
| Ano: 2021 |
URL: https://archimer.ifremer.fr/doc/00652/76396/77420.pdf |
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| Ky, Chin-long; Blay, Carole; Sham-koua, Manaarii; Vanaa, Vincent; Lo, Cedrik; Cabral, Philippe. |
| Individual Pinctada margaritifera molluscs were collected from the Takapoto atoll (Tuamotu Archipelago, French Polynesia) and used to produce ten first generation full-sib families in a hatchery system, following artificial breeding protocols. After three years of culture, these progenies were transferred to Rangiroa atoll (Tuamotu Archipelago, French Polynesia) and tested for their potential as graft donors. A large-scale grafting experiment of 1500 grafts was conducted, in which a single professional grafter used ten individual donor oysters from each of the ten families, grafting 15 recipient oysters from each donor. The recipient oysters were all obtained from wild spat collection in Ahe (Tuamotu Archipelago, French Polynesia). After 18 months of... |
| Tipo: Text |
Palavras-chave: Cultured pearl oyster; Pearl quality; Progeny effects; Heritability; Genetic selection; Pinctada margaritifera; French Polynesia. |
| Ano: 2013 |
URL: http://archimer.ifremer.fr/doc/00152/26310/24380.pdf |
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| Divilov, Konstantin; Schoolfield, Blaine; Morga, Benjamin; Dégremont, Lionel; Burge, Colleen A.; Mancilla Cortez, Daniel; Friedman, Carolyn S.; Fleener, Gary B.; Dumbauld, Brett R.; Langdon, Chris. |
| Background Variants of the Ostreid herpesvirus 1 (OsHV-1) cause high losses of Pacific oysters globally, including in Tomales Bay, California, USA. A suite of new variants, the OsHV-1 microvariants (μvars), cause very high mortalities of Pacific oysters in major oyster-growing regions outside of the United States. There are currently no known Pacific oysters in the United States that are resistant to OsHV-1 as resistance has yet to be evaluated in these oysters. As part of an effort to begin genetic selection for resistance to OsHV-1, 71 families from the Molluscan Broodstock Program, a US West Coast Pacific oyster breeding program, were screened for survival after exposure to OsHV-1 in Tomales Bay. They were also tested in a quarantine laboratory in... |
| Tipo: Text |
Palavras-chave: Ostreid herpesvirus 1; Crassostrea gigas; Heritability; Breeding. |
| Ano: 2019 |
URL: https://archimer.ifremer.fr/doc/00598/70974/69206.pdf |
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| Vandeputte, Marc; Bugeon, Jérôme; Bestin, Anastasia; Desgranges, Alexandre; Allamellou, Jean-michel; Tyran, Anne-sophie; Allal, Francois; Dupont-nivet, Mathilde; Haffray, Pierrick. |
| Fillet yield, the proportion of edible fillet relative to body weight, is a major trait to improve in fish sold processed, as it has a direct impact on profitability and can simultaneously decrease the environmental impact of producing a given amount of fillet. However, it is difficult to improve by selective breeding, because it cannot be measured on live breeding candidates, its phenotypic variation is low, and, as a ratio, it is not normally distributed and a same change in fillet yield can be the result of different changes in fillet weight and body weight. Residual headless gutted carcass weight (rHGCW) is heritable and highly genetically correlated to Fillet% in rainbow trout, and can be predicted by the ratio of abdominal wall thickness to depth of... |
| Tipo: Text |
Palavras-chave: Aquaculture; Fillet yield; Selective breeding; Selection response; Production efficiency; Heritability. |
| Ano: 2019 |
URL: https://archimer.ifremer.fr/doc/00599/71121/69423.pdf |
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| Bovi,Marilene Leão Alves; Resende,Marcos Deon Vilela de; Sáes,Luís Alberto; Uzzo,Roberta Pierry. |
| Archontophoenix palms, utilized both as ornamental species and as a source of high-quality heart of palm, are susceptible to sooty mold, a disease coupled with aphid infestation, which affects photosynthesis and causes unpleasant, darkish palm appearance. Scoring rates for sooty mold resistance and three growth traits were assessed under field conditions in 24 open-pollinated half-sibs families, 28 months after planting, aiming to identify genetic variability for sooty mold resistance; estimate genetic parameters for this trait and plant height, diameter and number of leaves; estimate genetic and phenotypic correlation for the four traits and evaluate selection methods for heart of palm production through multi-trait index selection based on growth traits.... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Capnodium; Cerataphis; Genetic gain; Heritability; King palm. |
| Ano: 2004 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162004000200009 |
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| Rahbar, Rabie; Aminafshar, Mehdi; Abdullahpour, Rohullah; Chamani, Mohammad. |
| The edited data set for the estimation of heritability, genetic and phenotypic correlations of fertility traits contained up to 23,402 records from 10,894 cows calved between 2001 and 2015. Heritability estimates for success in first service (FS), gestation length (GL), number of inseminations (NI), insemination outcome (IO), calving interval (CI), calving birth weight (CBW) and days open (DO) were low and ranged between 0.016 (DO) and 0.123 (GL). Repeatability of fertility traits was estimated to vary from 0.021 (FS) to 0.411 (IO). The genetic correlations between DO × CI, DO × NI and CI × NI were positive and nearly perfect (0.98, 0.88 and 0.88, respectively), while those between DO × IO and CI × IO were negative (-0.98 and -1, respectively). Further,... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Heritability; Repeatability; Genetic correlation; Phenotypic correlation; Heat stress.. |
| Ano: 2016 |
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAnimSci/article/view/31377 |
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| Ribeiro,Virgínia Mara Pereira; Merlo,Fernanda Albuquerque; Gouveia,Gabriela Canabrava; Winkelstroter,Larissa Kretli; Abreu,Luíza Rodrigues Alves; Silva,Marcos Vinícius Gualberto Barbosa da; Panetto,João Cláudio do Carmo; Paiva,Leandro de Carvalho; Cembranelli,Marcello de Aguiar Rodrigues; Toral,Fabio Luiz Buranelo. |
| Abstract: The objective of this work was to determine whether the random regression model using linear splines (RRMLS) is suitable to estimate the genetic parameters for productive and reproductive traits of a multiple-breed dairy cattle population, as well as to investigate the effect of the genetic group of the progeny on the genetic merit of the sire. The multiple-trait model (MTM) and the RRMLS with one knot fitted for every genetic group were used to obtain the genetic parameters. Records of 1/2 Holstein + 1/2 Gyr (1/2HG), 5/8 Holstein + 3/8 Gyr (5/8HG), and 3/4 Holstein + 1/4 Gyr (3/4HG) crossbreed dams were considered. The RRMLS showed better fitting. The additive and residual variances estimated by the MTM and the RRMLS were similar. Heritability... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Gyr; Heritability; Heterosis; Holstein; Selection. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2017001101109 |
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| Farooq,Jehanzeb; Khaliq,Ihsan; Kashif,Muhammad; Ali,Qurban; Mahpara,Shahzadi. |
| Several wheat genotypes were screened against heat stress. Seven wheat (Triticum aestivum L.) cultivars obtained after screening against heat classified as tolerant, moderately tolerant, and susceptible to heat stress, were mated in a complete diallel mating system to study the inheritance pattern of relative cell injury percentage (cell injury %) and some yield contributing parameters under normal and heat stress conditions. Significant genotypic differences were found (P < 0.01) for all the studied traits under both regimes. The scaling test disclosed partial adequacy for traits such as days to heading and days to maturity, but for flag leaf area and relative cell injury %, it showed full sufficiency under both environments. The model for grain yield... |
| Tipo: Journal article |
Palavras-chave: Relative cell injury percentage; Additive components; Adequacy test; Heritability; Wheat; Diallel. |
| Ano: 2011 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392011000400003 |
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| Moraes,Giovanna Faria de; Abreu,Luiza Rodrigues Alves; Ferreira,Isabel Cristina; Pereira,Idalmo Garcia. |
| ABSTRACT: The study of the genetic evaluation of residual feed intake adjusted for fat (RFIFat) is important for the appropriate use of feed efficiency in selection programs. The objective was to analyze the influence of selection for RFIF at on carcass and performance traits by estimating various genetic parameters. Data were analyzed from five tests of feed efficiency, which were conducted with 677 Nellore males. Genetic evaluation was performed by Bayesian inference using an animal model via single- and two-trait analyses. Variables analyzed were dry matter intake, average daily gain, RFIFat, rib eye area, back fat thickness, rump fat thickness, marbling score, and subcutaneous fat thickness. The posterior mean distributions estimated at each analysis... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Back fat thickness; Feed efficiency; Genetic correlation; Heritability. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782017000200651 |
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| Fraga,Angelina Bossi; Alencar,Maurício Mello de; Figueiredo,Leopoldo Andrade de; Razook,Alexander George; Cyrillo,Joslaine Noely dos Santos Gonçalves. |
| The objective of this study was to evaluate environmental factors that affect infestation of Caracu cattle breed by horn fly (Haematobia irritans) and to estimate genetic parameters for level of infestation. Infestation was evaluated on females from two herds in two consecutive years. Total number of flies on animals (FC) was counted, an infestation score (FS: 1 to 5) was recorded according to the estimated number of flies on animals, and number of parasites in photographs (FF) taken when the animals were evaluated was also counted. On each animal from one to eight observations were taken. A total of 3,836, 2,751 and 3,754 records from 718 animals were obtained for FC, FF and FS, respectively. The incidence of flies was lower during winter and higher... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Genetic correlation; Heritability; Horn fly counts; Repeatability. |
| Ano: 2005 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572005000200011 |
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| Forjaz,C.L.M.; Bartholomeu,T.; Rezende,J.A.S.; Oliveira,J.A.; Basso,L.; Tani,G.; Prista,A.; Maia,J.A.R.. |
| Blood pressure (BP) and physical activity (PA) levels are inversely associated. Since genetic factors account for the observed variation in each of these traits, it is possible that part of their association may be related to common genetic and/or environmental influences. Thus, this study was designed to estimate the genetic and environmental correlations of BP and PA phenotypes in nuclear families from Muzambinho, Brazil. Families including 236 offspring (6 to 24 years) and their 82 fathers and 122 mothers (24 to 65 years) were evaluated. BP was measured, and total PA (TPA) was assessed by an interview (commuting, occupational, leisure time, and school time PA). Quantitative genetic modeling was used to estimate maximal heritability (h²), and genetic and... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Exercise; Hypertension; Environmental influence; Heritability; Genetic epidemiology. |
| Ano: 2012 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2012001200023 |
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| Zambrano,Juan Carlos; Echeverri,Julián. |
| The objective of this study was to estimate the genetic, phenotypic and environmental parameters for calving interval (CI), days open (DO), number of services per conception (NSC) and conception rate (CR) in Holstein and Jersey cattle in Antioquia (Colombia). Variance and covariance component estimates were obtained by an animal model that was solved using the derivative-free restricted maximum likelihood method. The means and standard deviations for CI, DO, NSC and CR were: 430.32±77.93 days, 127.15±76.96 days, 1.58±1.03 services per conception and 79.88±28.66% in Holstein cattle, and 409.33±86.48 days, 125.62±86.09 days, 1.48±0.98 services per conception and 84.08±27.23% in Jersey cattle, respectively. The heritability estimates (standard errors) were:... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Fertility; Genetic correlation; Heritability; Repeatability. |
| Ano: 2014 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982014000300005 |
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| Registros recuperados: 177 | |
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