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| Registros recuperados: 177 | |
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| Moura,Vicente Pongitory Gifoni; Dvorak,William Stephen. |
| Pinus caribaea var. hondurensis (Sénécl) Barr. & Golf. is a tropical pine that naturally occurs in lowland areas of Belize, El Salvador, Guatemala, Honduras, Nicaragua, and eastern Mexico. It has been one of the most studied tropical pines and the one with the most commercial importance in Brazil. The objective of this work was to select the best provenances for plantations and best trees in families for the establishment of seed orchards. For that a trial with five provenances and 47 open-pollinated families was planted near Planaltina, Federal District, in the Cerrado Region of Brazil. The provenances tested were Poptun (Guatemala), Gualjoco, Los Limones, El Porvenir and Santa Cruz de Yojoa (Honduras) and assessed at 12 years of age. Poptun and... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Pinus; Selection criteria; Genetic gain; Heritability; Breeding methods. |
| Ano: 2001 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2001000200003 |
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| De Verdal, Hugues; Vandeputte, Marc; Mekkawy, Wagdy; Chatain, Beatrice; Benzie, John A. H.. |
| Background: Improving feed efficiency in fish is crucial at the economic, social and environmental levels with respect to developing a more sustainable aquaculture. The important contribution of genetic improvement to achieve this goal has been hampered by the lack of accurate basic information on the genetic parameters of feed efficiency in fish. We used video assessment of feed intake on individual fish reared in groups to estimate the genetic parameters of six growth traits, feed intake, feed conversion ratio (FCR) and residual feed intake in 40 pedigreed families of the GIFT strain of Nile tilapia, Oreochromis niloticus. Feed intake and growth were measured on juvenile fish (22.4g mean body weight) during 13 consecutive meals, representing 7days of... |
| Tipo: Text |
Palavras-chave: Feed conversion ratio; Tilapia; Heritability; Genetic estimations; Correlations. |
| Ano: 2018 |
URL: https://archimer.ifremer.fr/doc/00469/58115/60551.pdf |
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| Vandeputte, Marc; Porte, J. D.; Auperin, B.; Dupont-nivet, M.; Vergnet, Alain; Valotaire, C.; Claireaux, Guy; Prunet, P.; Chatain, Beatrice. |
| Sea bass is a major species in Mediterranean aquaculture, and is now being subject to selective breeding programs for faster growth. In terrestrial species, it was demonstrated that fast growth may be linked to a correlated degradation of fitness traits. In this experiment, we evaluated 600 young sea bass from a factorial mating of 76 sires and 13 dams. The sires were from four genetic groups, wild (W), domesticated (D), and selected for growth (2 groups, M and P). The 600 offspring were submitted to two acute confinement stress challenges at 6 weeks intervals, and plasma cortisol at one hour post stress was measured. The same fish were also submitted to two swimming challenges at a 5 days interval, where the maximum sustained swimming speed (Umax) of each... |
| Tipo: Text |
Palavras-chave: Aquaculture; Selective breeding; Stress response; Maximum sustained swimming speed; Heritability; Correlated response. |
| Ano: 2016 |
URL: https://archimer.ifremer.fr/doc/00308/41955/41218.pdf |
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| Andrade,João Antonio da Costa; Miranda Filho,José Branco de. |
| Good yield and intermediate plant height, ear height, and tassel size characterize the maize population ESALQ-PB1 as an outstanding breeding population. Estimates of genetic parameters are reported for 13 traits: plant height (PH), ear height (EH), ear placement (EP), tassel length (TL), tassel weight (TW), tassel branch number (TB), ear weight (EW), total grain weight (GW), ear length (EL), ear diameter (ED), kernel row number (RN), kernel number per row (KR) and prolificacy (PR). Results refer to one location and one year. Genetic variation was detected for all traits, and the estimates of the additive genetic variance are presented. The coefficients of heritability (individual basis) varied from 0.14 to 0.72 and were considered high for PH, EH and TB;... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Genetic parameters; Genetic variability; Heritability; Recurrent selection. |
| Ano: 2008 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162008000200011 |
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| Scalez,Daiane Cristina Becker; Fragomeni,Breno de Oliveira; Santos,Dalinne Chrystian Carvalho dos; Passafaro,Tiago Luciano; Alencar,Maurício Mello de; Toral,Fabio Luiz Buranelo. |
| ABSTRACT The objective of this study was to estimate genetic parameters for body weight of beef cattle in performance tests. Different random regression models with quadratic B-splines and heterogeneous residual variance were fitted to estimate covariance functions for body weights of Nellore and crossbred Charolais × Nellore bulls. The criteria −2 residual log-likelihood (−2RLL), Akaike Information Criterion (AIC), and consistent AIC (CAIC) were used to choose the most appropriate model. For Nellore bulls, residual variance was modeled with six classes of age, and direct additive genetic and permanent environment effects were modeled with quadratic B-splines with two and one intervals, respectively. For crossbred bulls, quadratic B-splines with one... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Animal breeding; Bos indicus; Genetic correlation; Heritability. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982018000100407 |
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| Siddiqui,Ameena; Shukla,Sudhir; Rastogi,Anu; Bhargava,Atul; Niranjan,Abhishek; Lehri,Alok. |
| Abstract: The objective of this work was to evaluate the relationship among phenotypic and quality traits in a set of indigenous and exotic accessions of linseed (Linum usitatissimum). The experimental material consisted of 151 accessions of linseed belonging to landraces and cultivars collected from diverse agroecological zones. Five randomly chosen plants of each accession in each replicate were tagged, and data were recorded for the 12 following agronomic traits: days to flowering, days to maturity, plant weight, plant height, tillers per plant, secondary branches per plant, capsules per plant, seeds per capsule, 1,000 seed weight, harvest index, seed yield per plant, and oil content. Capsules per plant, harvest index, and plant weight played a direct... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Linum usitatissimum; Correlation; Fatty acids; Genetic advance; Heritability; Path analysis. |
| Ano: 2016 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2016001201964 |
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| Silva, Ricardo Gonçalves; UFMA; Chaves, Maria da Cruz Lima; Agência Estadual de Pesquisa Agropecuária e Extensão Rural do Maranhão; Arnhold, Emmanuel; UFMA; Cruz, Cosme Damião; UFV. |
| O objetivo deste trabalho foi estimar parâmetros de repetibilidade e correlações fenotípicas em caracteres do fruto do bacuri (Platonia insignis Mart.). Foram avaliadas seis matrizes (genótipos) localizadas em seis municípios do Estado do Maranhão. Oito frutos foram colhidos por matriz, sendo mensurados diâmetro, comprimento, cavidade interna, peso e número de sementes por fruto, espessura da casca, peso de casca mais semente, rendimento de polpa, número de segmentos partenocárpico, Brix e acidez total titulável. Os dados foram submetidos à análise de variância. Os genótipos apresentaram variabilidade genética significativa para todos os caracteres, em nível de 1% de probabilidade pelo teste F. Apenas para cavidade interna do fruto, acidez total titulável... |
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Palavras-chave: 5.02.01.03-4 Genética e Melhoramento Florestal variância genética; Variância ambiental; Herdabilidade; Seleção 5.00.00.00-4 Ciências Agrárias; 5.01.00.00-9 Agronomia; 5.01.03.00-8 Fitotecnia; 5.01.03.05-9 Melhoramento Vegetal; Genetic variance; Environmental variance; Heritability; Selection. |
| Ano: 2009 |
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/723 |
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| Degremont, Lionel; Maurouard, Elise; Rabiller, Manuella; Glize, Philippe. |
| Massive spring mortality outbreaks have been reported in Mytilus spp. in France since 2014. The main areas affected are the Pertuis Charentais Sounds and the coast of the Pays de la Loire, which cultivate mainly M. edulis, and the putative causal agents remain unknown. We report the results of the first generation of mass selection focused on survival and resistance to the spring mortality in M. edulis. Two stocks of mussels were sampled in the Pertuis Charentais Sounds in 2014; one of these went through a spring mortality outbreak and the survivors were used to produce the selected stock, while the second stock was M. edulis considered to be naïve against the putative causal agents of the mortality outbreak and was used to produce the control stock. A... |
| Tipo: Text |
Palavras-chave: Spring mortality; Survival; Mytilus edulis; Heritability; Selection. |
| Ano: 2019 |
URL: https://archimer.ifremer.fr/doc/00505/61619/65530.pdf |
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| Gonçalves,Paulo de Souza; Martins,Antonio Lúcio Mello; Bortoletto,Nelson; Saes,Luis Alberto. |
| Five yield traits were investigated in three-year-old progenies from open-pollinated rubber trees [Hevea brasiliensis (Willd. ex Adr. de Juss) Muell.-Arg.]. Twenty progenies were evaluated in a randomized, complete block design replicated three times using 10 plants per linear plot at the North Central Experimental Station in Pindorama, São Paulo State, Brazil. The characters evaluated included the average yield of rubber, growth vigor, bark thickness, total number of latex vessel rings and latex vessel size. Highly significant (p < 0.01) genetic differences were observed among progenies for most traits. The genotypic variance components accounted for 13.2%, 12.3%, 9.4%, 3.4% and 0.23% of the phenotypic variance for yield, growth vigor, bark thickness,... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Hevea brasiliensis; Rubber tree; Heritability; Genetic parameters. |
| Ano: 2004 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572004000200014 |
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| McManus,Concepta; Pinto,Bruno Freitas; Martins,Rafhael Felipe Saraiva; Louvandini,Helder; Paiva,Samuel Rezende; Braccini Neto,José; Paim,Tiago do Prado. |
| Three production systems for sheep (Low - L, Medium - M and High - H technology), with increasing technological levels, were studied under conditions in the Center-west of Brazil, to determine economic weights and selection indices of important traits. Receipts and costs were simulated using an economic simulator to calculate the structure of the operational costs. Only characteristics that were responsible for more than 10% of the profit were studied, which included: number of weaned lambs, food consumption (ewe and lamb), weight of carcass and weight of female lambs sold for reproduction. Regardless of the index used (profitability or yield) or system (L, M or H), the economic weights are larger for the number of lambs weaned per ewe. With improvement in... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Correlations; Costs; Heritability; Profit; Revenue. |
| Ano: 2011 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982011001200014 |
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| Registros recuperados: 177 | |
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