RESUMOEstimaram-se os componentes de variância e covariância e as herdabilidades para os efeitos direto e materno, as correlações entre os efeitos direto e materno e a fração de ambiente permanente na variação total, utilizando-se o aplicativo MTDFREML, para os pesos ao nascer (PN), à desmama ajustado para 205 dias (P205), aos 365 (P365) e 550 (P550) dias de idade na raça Tabapuã, para avaliar o efeito materno e a associação dos efeitos direto e materno sobre características de crescimento. Os dados, provenientes do programa de controle ponderal da raça, foram registrados na fazenda Água Milagrosa, município de Tabapuã, São Paulo, no período de 1978 a 2002. As herdabilidades direta e materna foram: 0,32, 0,10; 0,20, 0,17; 0,21, 0,06 e 0,16; 0,03, para os pesos ao nascer, à desmama, aos 365 e 550 dias, respectivamente. As correlações entre os efeitos direto e materno para a mesma seqüência de pesos foram: -0,10; -0,20; -0,11 e -0,15. As frações do efeito de meio permanente na variância total foram: 1,41x10 -6 ; 2,5x10 -7 ; 2,4x10 -7 e 4,0x10 -6 . Recomenda-se a inclusão do efeito materno nos esquemas de seleção de características de crescimento na raça Tabapuã.Palavras-chave: bovino, efeito materno, parâmetros genéticos, correlação genética, crescimento, Tabapuã 1978 to 2002 are from Fazenda Água Milagrosa, located at São Paulo State. The direct and maternal heritability were, respectively, 0.32, 0.10; 0.20, 0.17; 0.21, 0.06 and 0.16; 0.03, for birth weight, weaning weight, weights at 365 and at 550 days of age. The correlations between direct and maternal effects for the same sequence of weights were -0.10; -0.20; -0.11 and -0.15. The fractions of permanent environmental of the phenotypic variance were 1.41x10 -6 ; 2.5x10 -7 ; 2,4x10 -7 and 4.0x10 -6 . The inclusion of maternal effect is recommended for growth traits evaluation of Tabapuã animals for selection purpose. ABSTRACT The variance and covariance components, heritability for direct and maternal effects, correlations between direct and maternal effects and permanent environmental component of variance were estimated, using the REML methodology for birth weight (BW), weaning weight adjusted for 205 days (W205), weights at 365 (W365) and at 550 (W550) days of age in Tabapuã animals. Maternal effect and the association between direct and maternal effects on growth traits were estimated. Animal records from
Adaptada a regiões de clima ameno e solos saturados de água, a cultura do trevo persa se apresenta como alternativa a produção de forragem nestas condições. Os lotes de sementes de trevo persa apresentam elevado percentual de dormência e associado a isso grande variabilidade de coloração de tegumento das sementes, fato este que pode estar relacionado à maturação e/ou deterioração das sementes. O objetivo do presente trabalho foi avaliar a influência da coloração do tegumento no tempo de escarificação de sementes de trevo persa, em lixa d’água, para superação de dormência. O estudo envolveu a combinação de dois fatores, sendo eles, fator A - coloração do tegumento (castanho, amarelo, verde claro, verde escuro e lote original) e fator B – tempos de escarificação com lixa d’água no 150 (zero, 1 e 3 minutos). As sementes das determinadas cores foram classificadas e escarificadas com lixa manualmente. Em seguida foram realizadas as determinações de peso de mil sementes, primeira contagem de germinação, percentual de germinação, índice de velocidade de emergência e percentual de emergência. Sementes de coloração de tegumento verde escuro apresentaram qualidade fisiológica superior e escarificação com lixa por 3 minutos obteve melhores resultados em IVE e percentual de emergência de plântulas.
The use of alternative crops in the off-season becomes interesting in the rotation system this system provides breaking of disease cycles, assisting in the control of weeds and insects. Safflower culture meets these precepts for use in this way in the state of Rio Grande do Sul, as well as assisting on the decompression and translocation of nutrients in the soil, as the root system can reach up to two meters deep. The experiment was constituted by 40 treatments, involving two factors: factor Aeight lots of safflower seed, factor Bfive collection points at the gravity table. Was utilized the delineation in a subdivided plot in factorial scheme (8X5), with four replicates. The seeds were subjected to the following determinations: specific mass, a thousand seeds mass, germination, first germination count, seedling emergence, full seedling length, full dry mass of the seedlings. The objective of this study was to evaluate the physical and physiological quality of seeds of Safflower (Carthamus tinctorius (L)) submitted to processing on the gravity table with different lots. The seeds collected at the upper exit of the desymmetric table presented the best characteristics, as well as the best characteristics observed compared to the seeds that didn´t processing.
The aimed to evaluate the effect of packages and different environment conditions in the maintenance of physiologic quality of Amaranthus cruentus seeds in the period of 300 days. The seeds used were from the cultivar BRS Alegria indicated for use in Brazilian winter. The experimental design completely randomized in factorial scheme (storage environment × package type × storage period) with four replicates. The amaranth seeds storage in plastic packages, in refrigerator and cold chamber, resulted in better germination maintenance ability. The conditioning in PET package, in natural and cold chamber environments promoted better results in relation to germination. The storage period did not present significant effect for the seeds stored in refrigerator and PET, although, for paper package there was reduction. The amaranth seeds, cv. BRS Alegria, can be stored in cold chamber for until 300 days, conditioned in PET, without reduction of its physiologic potential.
Treatment of pumpkin seeds with silicon: effects on mineral nutrition of seedlings Tratamento de sementes de abóbora com sílicio: efeitos na nutrição mineral das plântulas
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