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| Registros recuperados: 14 | |
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| Moreira, Heverton Luis; Savegnago, Rodrigo Pelicioni; Freitas, Luara Afonso; Lôbo, Raysildo Barbosa; Bezerra, Luiz Antônio Framartino; Paz, Claudia Cristina Paro de. |
| The objective of this study was to develop a bio-economic model for the estimation of economic values of economically important traits in a full-cycle beef cattle production system. The bio-economic model calculated economic values by simulating the impact of changes in the profit of the system consisting of a 1% increase in each trait of the breeding objective, while the other traits were kept constant. The bio-economic model was effective in estimating the sources of revenues and expenses of the production system. The estimated economic values were, in the order of importance for the full-cycle system, R$ 3.69 for male slaughter weight, R$ 3.63 for male weaning weight, R$ 3.58 for weaning rate, R$ 3.40 for female slaughter weight, R$ 2.30 for female... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: 5.04.02.00-5 bio-economic model; Economic weights; Genetic selection; Productive traits.. |
| Ano: 2019 |
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAnimSci/article/view/43361 |
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| Tayale, Alexandre; Gueguen, Yannick; Treguier, Cathy; Le Grand, Jacqueline; Cochennec-laureau, Nathalie; Montagnani, Caroline; Ky, Chin-long. |
| Producing high quality cultured black pearls from Pinctada margaritifera is one of the major challenges for the "pearl oyster" industry in French Polynesia. In order to assess donor effect on cultured pearl quality, wild Pinctada margaritifera originating from the Tuamotu Archipelago were used in a duplicated grafting experiment. After 12 months of culture, nucleus retention was assessed and seven pearl quality traits recorded on the 454 cultured pearls harvested from the experiment. The traits scored were nacre thickness and pearl weight, surface defects, lustre, grade, and the colour components: 1) darkness of cultured pearl colour, and 2) visual perception of colour class (bodycolor and/or overtone). Our results demonstrate for the first time that... |
| Tipo: Text |
Palavras-chave: Cultured pearl oyster; Pearl quality; Nacre; Donor mollusc; Genetic selection; Pteriidae; Blacklip pearl oyster; Pinctada margaritifera; French Polynesia. |
| Ano: 2012 |
URL: http://archimer.ifremer.fr/doc/00116/22757/20541.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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| Smits, Morgan; Enez, Florian; Ferraresso, Serena; Dalla Rovere, Giulia; Vetois, Emilie; Auvray, Jean-françois; Genestout, Lucie; Mahla, Rachid; Arcangeli, Giuseppe; Paillard, Christine; Haffray, Pierrick; Bargelloni, Luca. |
| The Manila clam Ruditapes philippinarum, a major cultured shellfish species, is threatened by infection with the microparasite Perkinsus olseni, whose prevalence increases with high water temperatures. Under the current trend of climate change, the already severe effects of this parasitic infection might rapidly increase the frequency of mass mortality events. Treating infectious diseases in bivalves is notoriously problematic, therefore selective breeding for resistance represents a key strategy for mitigating the negative impact of pathogens. A crucial step in initiating selective breeding is the estimation of genetic parameters for traits of interest, which relies on the ability to record parentage and accurate phenotypes in a large number of... |
| Tipo: Text |
Palavras-chave: Manila clam (Ruditapes philippinarum); Perkinsus olseni infection; Disease resistance; Genetic selection; Genetic parameter estimation. |
| Ano: 2020 |
URL: https://archimer.ifremer.fr/doc/00658/77031/78319.pdf |
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| Delaporte, Maryse; Soudant, P; Lambert, C; Jegaden, M; Moal, Jeanne; Pouvreau, Stephane; Degremont, Lionel; Boudry, Pierre; Samain, Jean-francois. |
| Within the framework of a national scientific program named "MORtalites ESTivales de l'huitre creuse Crassostrea gigas" (MOREST), a family-based experiment was developed to study the genetic basis of resistance to summer mortality in the Pacific oyster, Crassostrea gigas. As part of the MOREST project, the second generation of three resistant families and two susceptible families were chosen and pooled into two respective groups: "R" and "S". These two groups of oysters were conditioned for 6 months on two food levels (4% and 12% of oyster soft-tissue dry weight in algal dry weight per day) with a temperature gradient that mimicked the Marennes-Oleron natural cycle during the oyster reproductive period. Oyster mortality remained low for the first two... |
| Tipo: Text |
Palavras-chave: Summer mortality; Reproduction; Reactive oxygen species ROS; Hemocyte parameters; Genetic selection; Crassostrea gigas. |
| Ano: 2007 |
URL: http://archimer.ifremer.fr/doc/2007/publication-3578.pdf |
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| Samain, Jean-francois; Degremont, Lionel; Soletchnik, Patrick; Haure, Joel; Bedier, Edouard; Ropert, Michel; Moal, Jeanne; Huvet, Arnaud; Bacca, Helene; Van Wormhoudt, A; Delaporte, Maryse; Costil, K; Pouvreau, Stephane; Lambert, Christian; Boulo, Viviane; Soudant, Philippe; Nicolas, Jean-louis; Leroux, Frederique; Renault, Tristan; Gagnaire, Beatrice; Geret, Florence; Boutet, Isabelle; Burgeot, Thierry; Boudry, Pierre. |
| Summer mortality of Pacific oysters is known in several countries. However no specific pathogen has been systematically associated with this phenomenon. A complex combination of environmental and biological parameters has been suggested as the cause and is now starting to be identified. A high genetic basis was found for survival in oysters when a first generation (G1) was tested in three sites during summer. This paper presents a synthesis on physiological characteristics of two selected groups ('R' and 'S', from families selected for resistance and susceptibility to summer mortality respectively), of the second and third generations. R and S showed improvement or reduction of survival compared with the control in both field and laboratory trials... |
| Tipo: Text |
Palavras-chave: ROS; Temperature; Stress; Hemocytes; Reproduction; Genetic selection; Resistant oyster; Crassostrea gigas; Pacific Oyster; Summer mortality. |
| Ano: 2007 |
URL: http://archimer.ifremer.fr/doc/2007/publication-2809.pdf |
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| Bécquer Zuñiga, U.. |
| En Cuba el cultivo de camarÿn marino Litopenaeus schmitti ha sido una actividad priorizada por el Estado, por la cantidad de empleos que genera y los ingresos obtenidos por la comercializaciÿn del producto final. Trabajos previos indican el conocimiento de la estructura genþtica de las poblaciones de esta especie empleando marcadores moleculares, existen estudios sobre reproducciÿn y nutriciÿn. Finalmente, el cierre del ciclo de cultivo en cautiverio sumado a la experiencia de casi dos dþcadas en esta actividad promueven la necesidad de comenzar el mejoramiento genþtico de L. schmitti por crýas selectivas en el paýs. En este trabajo se describe una metodologýa para la formaciÿn de grupos genþticos por... |
| Tipo: Theses and Dissertations |
Palavras-chave: Shrimp culture; Genetic selection; Population genetics. |
| Ano: 2005 |
URL: http://hdl.handle.net/1834/5399 |
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| Castellanos Gell, J.. |
| La mayoría de los peces de arrecifes poseen un estadio larval pelágico durante el cual pueden ser transportados largas distancias. La inferencia de estos patrones de conectividad a partir de estudios genético-poblacionales, ha cobrado gran auge debido a su utilidad en el diseño de áreas marinas protegidas. Este trabajo se propone analizar la influencia de las posibles barreras físicas, la biología de la especie y sus potenciales de dispersión, en la estructura genética de Stegastes partitus y brindar elementos al esclarecimiento de esta problemática en el archipiélago cubano. Se colectaron individuos de cinco localidades del archipiélago cubano: Los Canarreos y La Bajada, en la región Suroccidental; y por el Norte: Cayo Coco, Los Colorados, y... |
| Tipo: Theses and Dissertations |
Palavras-chave: Population genetics; Marine structures; DNA; Genetic selection. |
| Ano: 2008 |
URL: http://hdl.handle.net/1834/5513 |
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| Oliveira,Thiago Wendling Gonçalves de; Paula,Rinaldo Cesar de; Moraes,Mario Luiz Teixeira de; Alvares,Clayton Alcarde; Miranda,Aline Cristina; Silva,Paulo Henrique Muller da. |
| Abstract: The objective of this work was to evaluate the genotype x environment (GxE) interaction in open-pollinated Eucalyptus saligna progenies for simultaneous selection for greater stability and adaptability for wood volume, as well as to compare the selection strategies through combined and individual analyses in three environments. Three experiments were conducted in a randomized complete block design, with four replicates and six plants per plot, with 102 to 122 progenies. Three years after planting, survival rate and wood volume were evaluated. The genetic parameters were estimated by the maximum restricted likelihood and best linear unbiased prediction (REML/Blup) methods, and the stability and adaptability analysis was conducted using the... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Forest breeding; Genetic selection; Genotype × environment interaction; REML/Blup. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2018000500611 |
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| Tisdell, Clement A.. |
| While genetic selection and cultivation of organisms have helped to support a larger human population at a higher standard of living, than otherwise, these developments have also led to a loss of biodiversity, particularly in the wild. The more recent development of aquaculture continues this development process. In this note, aquaculture practices that are likely to lead to biodiversity loss are listed and their consequences are specified. Trends in fish supplies from aquaculture compared to supplies from the wild are outlined. These indicate increasing replacement of supplies form the wild by aquaculture. A similar pattern seems to be emerging as has emerged in agriculture and in silvaculture. This is likely to accelerate biodiversity loss in wild... |
| Tipo: Working or Discussion Paper |
Palavras-chave: Aquaculture; Loss of biodiversity; Genetic selection; Environmental Economics and Policy. |
| Ano: 2006 |
URL: http://purl.umn.edu/55096 |
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| Registros recuperados: 14 | |
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