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| Registros recuperados: 23 | |
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| YOSHIDA, G. M.; OLIVEIRA, C. A. L. de.; OLIVEIRA, S. N. de.; KUNITA, N. M.; RESENDE, E. K. de; ALEXANDRE FILHO, L.; RIBEIRO, R. P.. |
| O objetivo deste trabalho foi estimar as herdabilidades e a estrutura de correlações genéticas entre as características de desempenho de tilápia-do-nilo (Oreochromis niloticus) da linhagem GIFT, em diferentes estágios do ciclo de produção. As tilápias foram cultivadas em tanques - rede. Mediu-se ganho em peso diário total, peso vivo e ganho em peso diário, em quatro períodos, com intervalos de aproximadamente 30 dias. Foram realizadas análises unicaracter para as medidas, em todas as biometrias e, nas análises bicaracter, as medidas de mesma característica foram combinadas duas a duas e com o ganho em peso diário total. As estimações de herdabilidade variaram de 0,15 a 0,11 para peso vivo, 0,16 a 0,09 para ganho em peso diário e 0,17 a 0,12 para ganho em... |
| Tipo: Artigo em periódico indexado (ALICE) |
Palavras-chave: Oreochromis niloticus; Correlações genéticas; Herdabilidade; Linhagem GIFT; Velocidade de crescimento; Genetic correlations; Heritability; GIFT strain; Growth rate. |
| Ano: 2013 |
URL: http://www.alice.cnptia.embrapa.br/handle/doc/973762 |
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| GONCALVES, P. de S.; GALLO, P. B.; SEGNINI JUNIOR, I.; ORTOLANI, A. A.; BRIOSCHI, A. P.; LANDELL, M. G.; SOUZA, S. R. de.. |
| To determine the nature and extent of genetical and environmental control of vigour through annual girth increment in rubber trees [Hevea brasiliensis (Willd.ex Adr. de Juss.) Muell.Arg.], seven clones were studied in a replicated trial in Sao Paulo State at four different locations. The clones represented a range of imported germplasm while the locations were selected to represent a range of rubber growing areas. Trees were studied for annual girth increment over five years before the initiation of tapping for latex. The results of the analyses show a consistent decrease in genetic component over the five years from 10 per cent to 0,5 per cent with a corresponding increase in the effect of environment (19,0 per cent to 93,0 per cent). The genotype x... |
| Tipo: Artigo em periódico indexado (ALICE) |
Palavras-chave: Hevea brasiliensis; Clones; Correlacao genetica; Genetic correlations. |
| Ano: 1998 |
URL: http://www.alice.cnptia.embrapa.br/handle/doc/87644 |
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| Baldi,Fernando; Laureano,Monyka Marianna Massolini; Gordo,Daniel Gustavo Mansan; Bignardi,Annaiza Braga; Borquis,Rusbel Raul Aspilcueta; Albuquerque,Lucia Galvão de; Tonhati,Humberto. |
| The objectives of this study were to estimate the genetic parameters for milk yield unadjusted and adjusted for days in milk and, subsequently, to assess the influence of adjusting for days in milk on sire rank. Complete lactations from 90 or 150 days of lactation to 270 or 350 days in milk were considered in these analyses. Milk yield was adjusted for days in milk by multiplicative correction factors, or by including lactation length as a covariable in the model. Milk yields adjusted by different procedures were considered as different traits. Heritability estimates varied from 0.17 to 0.28. Genetic correlation estimates between milk yields unadjusted and adjusted for days in milk were greater than 0.82. Adjusting for days in milk affected the parameter... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Genetic correlations; Heritability; Lactation length; Milk production; Rank correlations. |
| Ano: 2011 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572011000100012 |
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| Madad,Mostafa; Hossein-Zadeh,Navid Ghavi; Shadparvar,Abdol Ahad. |
| Abstract: The objective of this work was to estimate covariance functions for additive genetic and permanent environmental effects, as well as to obtain genetic parameters for buffalo test-day milk yield using random regression models on Legendre polynomials (LPs). A total of 2,538 test-day milk yield (TDMY) records from 516 first lactation records of Khuzestan buffalo, calving from 1993 to 2009 and belonging to 150 herds located in the state of Khuzestan, Iran, were analyzed. The residual variances were modeled through a step function with 1, 5, 6, 9, and 19 classes. The additive genetic and permanent environmental random effects were modeled by LPs of days in milk using quadratic to septic polynomial functions. The model with additive genetic and animal... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Covariance functions; Genetic correlations; Heritability; Legendre polynomial; Milking buffalo.. |
| Ano: 2016 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2016000700890 |
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| Prchal, Martin; Vandeputte, Marc; Gela, David; Dolezal, Marek; Blichtova, Hana; Rodina, Marek; Flaishans, Martin; Kocour, Martin. |
| Fish are a rich source of omega-3 polyunsaturated fatty acids (n-3 PUFAs) and thus, they should be an integral part of human diet at least twice a week. As a result, high attention has been devoted to the improvement of fatty acids (FA) content in the flesh of farmed fish through nutrition. Conversely, there are very few data on the potential of selective breeding to improve FA composition in fish. We estimated genetic parameters of fillet fatty acid content and performance traits in market size common carp cultured under semi-intensive pond conditions. The experimental stock arose through factorial mating of 7 dams and 36 sires. All families were reared communally. Pedigree was reconstructed with microsatellite markers, and 158 individuals were dressed... |
| Tipo: Text |
Palavras-chave: Genetic correlations; Genetic improvement; Growth; Heritability; Slaughtering traits; Supplemental feeding. |
| Ano: 2018 |
URL: https://archimer.ifremer.fr/doc/00449/56043/57558.pdf |
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| LOBO, R. N. B.; LOBO, A. M. B. O.; FACO, O.; VILLELA, L. C. V.. |
| Parâmetros genéticos foram estimados para características reprodutivas e de habilidade materna em ovinos de corte. Foram utilizados dados de uma fazenda controlada pelo Programa de Melhoramento Genético de Caprinos e Ovinos de Corte (GENECOC). Foram analisadas as características idade ao primeiro parto (IPP), intervalo de partos (IP), dias para o parto (DP), período de gestação (PG) e os pesos totais de crias ao nascimento (PTCN) e à desmama por matriz (PTCD). Os dados foram analisados pelo método da Máxima Verossimilhança Restrita Livre de Derivadas sob modelo animal. As estimativas de herdabilidade para IPP, IP, DP, PG, PTCN e PTCD foram, respectivamente, 48±0,10, 0,00±0,04, 0,00±0,11, 0,13±0,04, 0,12 e 0,06. As estimativas sugerem a possibilidade da... |
| Tipo: Artigo em anais de congresso (ALICE) |
Palavras-chave: Ovino de corte; Genética animal; Correlação genética; Herdabilidade; Ganho de peso; Crescimento; Parâmetros genéticos; Desmama; Abate; Peso ao nascer; Genetic correlations; Heritability; Weights at birth. |
| Ano: 2007 |
URL: http://www.alice.cnptia.embrapa.br/handle/doc/530183 |
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| Taris, Nicolas; Sauvage, Christopher; Ernande, Bruno; Boudry, Pierre. |
| Among bivalve species, the Pacific oyster, Crassostrea gigas, is the most economically important bivalve production over the world. Today, C. gigas is subject to an important production effort that leads to an intensive artificial selection. Larval stage is relatively unknown, specifically in a domestication context. Genetic consequence of artificial selection is still at a preliminary study. We aimed to tackle the consequence of inconscient domestication on the variance reproductive success focusing on larval stage, keystone of the life cycle. We studied two kinds of specific selective processes that common hatchery rearing practices exert : the effect of discarding the smallest larvae on genetic diversity and the artificial environment rearing effect via... |
| Tipo: Text |
Palavras-chave: Selection; Genetic correlations; Genetic variability; Genetic; Domestication selective; Crassostrea gigas; Pacific oysters. |
| Ano: 2005 |
URL: http://archimer.ifremer.fr/doc/2005/acte-3441.pdf |
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| Sturion,José Alfredo; Stuepp,Carlos André; Wendling,Ivar. |
| ABSTRACT The selection of yerba mate superior genotypes, based on each plant leaf weight, is based on genetic parameters obtained from experimental plantations and it is practically impossible from the fourth year of age. Therefore, we estimate genetic parameters and check the feasibility of selection through notes and weight estimates of each tree at 18.5 years of age. The genetic material consists of a combined trial of provenances and progenies of half-sibs with 140 progenies from 7 provenances, installed in Ivaí, Paraná, Brazil, in a randomized block design with 10 repetitions. The genetic control of leaf production is of low magnitude (ĥ2a= 0.175042 ± 0.0393) revealing high influence of the environment. The additive genetic correlations between the... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Genetic correlations; Yerba mate; Silviculture; Progeny trial. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87052017000400492 |
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| Lôbo,Raimundo N.B.; Vieira,Luiz S.; Oliveira,Amaury A. de; Muniz,Evandro N.; Silva,José M. da. |
| Worm infection is one of the main factors responsible for economic losses in sheep breeding in Brazil. Random regression analysis was used to estimate genetic parameters for the factors faecal egg-count (FEC), packed-cell volume (PCV) and body weight (BW) in Santa Inês lambs. Data from 119 female, offspring of nine rams, were collected between December, 2005 and December, 2006, from the experimental flock of Embrapa Tabuleiros Costeiros, the Brazilian Agricultural Research Corporation located in Frei Paulo, SE, Brazil. After weaning, females were drenched until the faecal egg count had dropped to zero. Two natural challenges were undertaken. FEC heritability was extremely variable, this increasing from 0.04 to 0.27 in the first challenge and from 0.01 to... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Genetic correlations; Heritability; Legendre polynomials; Random regression. |
| Ano: 2009 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572009000200014 |
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| Padilha,Alessandro Haiduck; Sattler,Aroni; Cobuci,Jaime Araújo; McManus,Concepta Margaret. |
| Heritability and genetic correlations for honey (HP) and propolis production (PP), hygienic behavior (HB), syrupcollection rate (SCR) and percentage of mites on adult bees (PMAB) of a population of Africanized honeybees were estimated. Data from 110 queen bees over three generations were evaluated. Single and multi-trait models were analyzed by Bayesian Inference using MTGSAM. The localization of the hive was significant for SCR and HB and highly significant for PP. Season-year was highly significant only for SCR. The number of frames with bees was significant for HP and PP, including SCR. The heritability estimates were 0.16 for HP, 0.23 for SCR, 0.52 for HB, 0.66 for PP, and 0.13 for PMAB. The genetic correlations were positive among productive traits... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Heritability; Genetic correlations; Environmental effects; Apis mellifera. |
| Ano: 2013 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572013000200011 |
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| Aspilcueta-Borquis,Rusbel Raúl; Sesana,Roberta Cristina; Berrocal,Milthon Honorio Munoz; Seno,Leonardo de Oliveira; Bignardi,Annaiza Braga; El Faro,Lenira; Albuquerque,Lucia Galvão de; Camargo,Gregório Miguel Ferreira de; Tonhati,Humberto. |
| The objective of the present study was to estimate genetic parameters for test-day milk, fat and protein yields and 305-day-yields in Murrah buffaloes. 4,757 complete lactations of Murrah buffaloes were analyzed. Co-variance components were estimated by the restricted maximum likelihood method. The models included additive direct genetic and permanent environmental effects as random effects, and the fixed effects of contemporary group, milking number and age of the cow at calving as linear and quadratic covariables. Contemporary groups were defined by herd-year-month of test for test-day yields and by herd-year-season of calving for 305-day yields. The heritability estimates obtained by two-trait analysis ranged from 0.15 to 0.24 for milk, 0.16 to 0.23 for... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Test-day model; Accumulated productions; Heritability; Genetic correlations. |
| Ano: 2010 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572010000100014 |
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| Campos,Rafael Viegas; Cobuci,Jaime Araujo; Costa,Claudio Napolis; Braccini Neto,José. |
| Data from 26,558 Holstein cows in 802 herds were used to estimate genetic, residual and phenotypic parameters for 22 type traits. The model included the fixed effects of herd-year, period of classification, classifier, stage of lactation and age of cows at calving (covariate) and random genetic and residual effects. Heritability for type traits ranged from 0.10 to 0.39. The genetic variability in these traits suggested the possibility for moderate genetic gains through selection. The phenotypic correlations were moderated, mainly in the section conformation. Genetic correlations between type traits ranged from -0.44 to 0.85. High genetic correlations indicated that breeding programs could be successful without including all type traits. The selection for... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: (co)variance components; Dairy cattle; Genetic correlations; Heritability; REMLF90; Selection. |
| Ano: 2012 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982012001000003 |
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| CASSIANO, L.A.P.; MARIANTE, A. da S.; McMANUS, C.; MARQUES, J.R.F.; COSTA, N.A. da. |
| O objetivo deste trabalho foi estimar componentes de variância e parâmetros genéticos, incluindo correlações genéticas, fenotípicas e herdabilidade das características produtivas e reprodutivas de búfalos na Amazônia brasileira. As estimativas de herdabilidade (h2) das características variaram de 0,04 a 0,05 no primeiro intervalo entre partos, de 0,0 a 0,26 no intervalo entre partos, e de 0,0 a 0,25 no período de serviço, refletindo grande influência ambiental. Na idade ao primeiro parto, a herdabilidade variou de 0,12 a 0,38. Em relação ao peso ao nascer, a raça Murrah foi a que apresentou a mais alta h2 (0,62). As correlações genéticas variaram de 1,00 a -1,00. Foram negativas as correlações genéticas entre idade ao primeiro parto e peso da fêmea adulta... |
| Tipo: Artigo em periódico indexado (ALICE) |
Palavras-chave: Correlações genéticas; Herdabilidades; Índices de produção e reprodução; Genetic correlations; Heritabilities; Production and reproduction indices. |
| Ano: 2004 |
URL: http://www.alice.cnptia.embrapa.br/handle/doc/111177 |
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| Prchal, Martin; Bugeon, Jerome; Vandeputte, Marc; Kause, Antti; Vergnet, Alain; Zhao, Jinfeng; Gela, David; Genestout, Lucie; Bestin, Anastasia; Haffray, Pierrick; Kocour, Martin. |
| Common carp is a major aquaculture species worldwide, commonly sold alive but also as processed headless carcass or filets. However, recording of processing yields is impossible on live breeding candidates, and alternatives for genetic improvement are either sib selection based on slaughtered fish, or indirect selection on correlated traits recorded in vivo. Morphological predictors that can be measured on live fish and that correlate with real slaughter yields hence remain a possible alternative. To quantify the power of morphological predictors for genetic improvement of yields, we estimated genetic parameters of slaughter yields and various predictors in 3-year-old common carp reared communally under semi-intensive pond conditions. The experimental... |
| Tipo: Text |
Palavras-chave: Heritability estimates; Genetic correlations; Indirect selection; Morphological landmarks; Slaughter yields; Ultrasound imagery. |
| Ano: 2018 |
URL: http://archimer.ifremer.fr/doc/00451/56242/57806.pdf |
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| Registros recuperados: 23 | |
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