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Fortes-Silva R.,University of Murcia | de Almeida Torres R.,Federal University of Vicosa | Ribeiro-Filho O.P.,6571 000 Vicosa MG | Schiavetti V.L.,Federal University of Vicosa | And 4 more authors.
Zootecnia Tropical | Year: 2010

Genetic parameters to design or optimize breeding programs for these body weights are lacking. To evaluate the potential of mass selection for growth, genetic parameters are required. The goal of this study was estimate genetic parameters of growth characteristics in Nile tilápia (Oreochromis niloticus) in naturals conditions of low temperature. Information on 800 full-sib provide by 20 families was used. Fishes were weighed every 12 ± 2 days until end of experiment (150 days). Proc Mixed was used to evaluate the variance and covariance components and to obtain heritability and correlations. Unicharacteristic model via REML, considering fixed effect the contemporary group (tank and sex) and genetic effect (animal) was used. Measurements for weight at 60 days (W60), weight at 150 days (W150), length at 60 days (L60), length to 150 days (L150), daily weight gain (DWG), daily length gain (DLG), Carcass (EC) and carcass efficiency (CE) were: 31,62g; 220,54g; 10,50cm; 90,60cm; 1,68g; 0,69cm; 83,89g; 0,87g respectively. High heritability and genetic correlation for body weight and eviscerated dressing Values of Nile Tilapia obtained in this study, can be used in future studies of animal breeding, intending to increase the proportion characteristics related to body weight.

da Mota W.F.,UNIMONTES Depto Ciencias Agrarias | Finger F.L.,6571 000 Vicosa MG | Cecon P.R.,6571 000 Vicosa MG | da Silva D.J.H.,6571 000 Vicosa MG | And 3 more authors.
Horticultura Brasileira | Year: 2010

This work had the goal to evaluate the influence of PVC film and temperature on the postharvest storage life in four cultivars of okra. The treatments were displayed in randomized complete blocks, in split-split-plot design, where the parcels were the temperatures of 5 and 10°C, and in the sub parcels a 2 (control and PVC wrapped fruits) × 4 (cultivars Amarelinho, Red Velvet, Star of David and Mammoth Spinless) factorial, and in the sub-sub parcels six sampling moments, containing four blocks. Storage at 10°C and wrapping the fruits with PVC film improved the control of fresh mass loss. The film was more efficient in maintaining higher water content in the fruit pericarp at 5 or 10°C. The cultivar Amarelinho lost less fresh mass and maintained higher water content. Fruits stored at 5°C had higher vitamin C content. The cultivars Mammoth Spinless and Star of David showed lower losses of vitamin C. Cultivar Mammoth Spinless had the highest content of chlorophyll and Amarelinho the lowest. In general the development of chilling and browning was higher in fruits without PVC film at 5°C. The cultivar Amarelinho had better postharvest conservation at 10°C and using PVC film.

de Lima H.E.,6571 000 Vicosa MG | do Rego E.R.,Federal University of Paraiba | Cavalcante G.P.,6571 000 Vicosa MG | do Rego M.M.,Federal University of Paraiba | Cota L.V.,6571 000 Vicosa MG
Horticultura Brasileira | Year: 2010

The bacterial wilt caused by Ralstonia solanacearum is the most important bacterial disease of tomato in the Brazilian North Region. The objectives of this study were to evaluate (1) the resistance level of ten tomato cultivars; (2) the progress of bacterial wilt in these genotypes in order to know the disease behavior in different stages of development of the crop, and (3) determine the critical time to disease development in these cultivars, in Roraima. The experiment was carried out in a field naturally infested with biovar 1 of R. solanacearum, during two years. The area was infested by cultivating susceptible tomato plants to bacterial wilt. The cvs. Majestade, Nemonetta, Carmen, Liliane, Santa Clara, Sensação, San Vito, Gaúcho Melhorado, Hector and Laura were cultivated in the infested field. Six disease incidence evaluations were done in seven plants with irreversible wilt and/or death during the crop cycle. The following variables were determined: area under the disease progress curve (AUPDC) and the progress rate (r), mean incidence (Y50), maximum incidence (Ymax) and the final incidence of the disease. The values of AUDPC and the variable r to 'Majestade' were the lowest, although the level of resistance shown by this cultivar was not very high. Therefore, 'Majestade' is recommended for planting in the State of Roraima, especially considering the high prices of tomatoes, which are purchased from other regions in the country. However, only the level of resistance of 'Majestade' is not sufficient for disease control, being necessary other control measures.

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