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xxx F.A. Damasceno, J.A. Osorio, C.E. Alves Oliveira, P.F.P. Ferraz and L.F. Brandão
Assessment of a low-cost solar water heating systems in farrowing facilities
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Assessment of a low-cost solar water heating systems in farrowing facilities

F.A. Damasceno¹*, J.A. Osorio², C.E. Alves Oliveira¹, P.F.P. Ferraz¹ and L.F. Brandão³

¹Department of Engineering, Federal University of Lavras, BR37200-000 Lavras - Minas Gerais, Brasil
²University National of Colombia, Faculty of Agrarians Science, Department of Agricultural and Food Engineer, Calle 59 A N 63-20, CO050001 Medellín, Colombia
³Department of Engineering, Federal University of Ouro Preto, BR35400-000 Ouro Preto – Minas Gerais, Brasil
*Correspondence: flavio.damasceno@deg.ufla.br

Abstract:

The objective of this study was to develop a prototype solar heater using alternative materials and then to compare its thermal efficiency against that of two other commercial solar heating systems when heating the floor of piglet housing. To evaluate the thermal heaters, temperature sensors were installed in the inlet and outlet of each floor and the thermal reservoir. The results showed good performance, however the thermal efficiency of the alternative heater was lower than the conventional systems. However, due to the construction of this solar collector with alternative materials its cost was relatively low and its operation is easier than the other conventional heater, therefore this heater is a good alternative to use for small livestock producer.

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xxx O. Gayosso-Barragán, A. López-Benítez, S.A. Rodríguez-Herrera, J.N. Ek-Maas, D.M. Hidalgo-Ramos and J.S.G.J. Alcala-Rico
Studies on combining ability in tomato (Solanum lycopersicum L.)
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Studies on combining ability in tomato (Solanum lycopersicum L.)

O. Gayosso-Barragán, A. López-Benítez*, S.A. Rodríguez-Herrera, J.N. Ek-Maas, D.M. Hidalgo-Ramos and J.S.G.J. Alcala-Rico

Universidad Autónoma Agraria Antonio Narro, Departamento de Fitomejoramiento, Calzada Antonio Narro 1923, MX25315 Saltillo, Coahuila, México
*Correspondence: alfopezbe_2000@hotmail.com

Abstract:

The present study was done seven elite tomato lines (Solamun lycopersicum L.) of determinate and indeterminate growth with good yield potential and good combining ability, using diallel fashion without reciprocals to produce 21 F1s. General combining ability (GCA) and Specific combining ability (SCA) analysis were conducted, with Diallel-SAS, assessing six yield and component traits. Results showed highly significant differences (p ≤ 0.01) among genotypes, as well as in GCA and SCA effects in all the characteristics that was assessed, with the exception of Days to First Cut. The results revealed that variance contribution to the yield attributed to the crossings had more non-additive effects (SCA) than additive effects (GCA). Furthermore, Line D4 had the greatest effect on yield in terms of GCA, as well in AFW (Average Fruit Weight), NFP (Number of Fruits per Plant) and PD (Polar Diameter) followed by D3 and K3. These lines can be used as donor parent in future tomato-breeding program. Hybrids K3×D4, R1×Y53, D3×IR13 and F3×Y53 had the highest level of SCA, with average yields of 93 t ha-1. These potential hybrids could be exploited at commercial level after critical testing.

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xxx L. Argentel-Martínez, J. Garatuza-Payán, T. Arredondo, E.A. Yépez
Effects of experimental warming on peroxidase, nitrate reductase and glutamine synthetase activities in wheat
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Effects of experimental warming on peroxidase, nitrate reductase and glutamine synthetase activities in wheat

L. Argentel-Martínez¹², J. Garatuza-Payán¹³, T. Arredondo⁴, E.A. Yépez¹³*

¹Instituto Tecnológico de Sonora, 5 de febrero, 818 Sur, Col. Centro, Cd. Obregón, Sonora, México, CP: 85000
²Instituto Tecnológico del Valle del Yaqui, Calle 600, Block 611, Bácum, San Ignacio Río Muerto, Sonora, México, CP: 85275
³Laboratorio Nacional de Geoquímica y Mineralogía, Sede Regional Sur de Sonora, 5 de febrero, 818 Sur, Col. Centro, Cd. Obregón, Sonora, México, CP: 85000
⁴Instituto Potosino de Investigación Científica y Tecnológica. Camino a la Presa San José 2055, Col. Lomas, Sección 4, San Luis Potosí, México, CP: 78216
*Corresponding author: enrico.yepez@itson.edu.mx

Abstract:

Given the effects of climate change and its significant consequences on plant productivity, it is necessary to evaluate the enzymatic responses of the most important crops such as wheat (Triticum durum L.). We examined the response of foliar peroxidase activity, nitrate reductase, and glutamine synthetase to experimental increments of temperature (+2 °C) under field conditions following conventional agricultural practices. Foliar samples, in both control and warming treatments were taken during growth, tillering and flowering phenophases to test the peroxidase activity. Similarly, nitrate reductase, glutamine synthetase activities, and glutamine content were measured during the heading phenophase. Due to the effects of experimental warming, peroxidase activity significantly increased. The nitrate reductase activity was also higher in the warming treatment, suggesting a high nitrogen metabolism efficiency. Whereas, the increase observed in the glutamine synthetase activity, and consequently the glutamine content, evidenced a biochemical signal of an early senescence due to the effect of warming.

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xxx N. Lebedová, R. Stupka, J. Čítek, M. Okrouhlá and K. Zadinová
Effect of feed restriction on muscle fibre characteristics and meat quality traits in pigs
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Effect of feed restriction on muscle fibre characteristics and meat quality traits in pigs

N. Lebedová*, R. Stupka, J. Čítek, M. Okrouhlá and K. Zadinová

Czech University of Life Sciences Prague, Faculty of Agrobiology, Food and Natural Resources, Department of Animal Science, Kamýcká 129, CZ16500 Prague, Czech Republic
*Correspondence: lebedova@af.czu.cz

Abstract:

The aim of this study was to evaluate the effect of feed restriction on muscle fibre composition and meat quality traits in pigs. Forty crossbred pigs (Pietrain × Large WhiteSire) × (Landrace × Large WhiteDam) were divided into two feeding groups: ad libitum (AL) and restricted (R1). The effects of feed restriction on muscle fibre characteristics of the musculus longissimus lumborum et thoracis (MLLT) and meat quality traits were evaluated. Muscle fibres were stained and classified as fibre types I, IIA, and IIB. For each muscle fibre type, the fibre density, fibre cross-section area (CSA), and fibre proportion were determined. Fibres IIB were divided into small- (diameter < 46 μm), medium- (diameter 46–86 μm) and large-sized (diameter > 86 μm) fibres. The AL group had significantly lower (P < 0.05) percentage area of IIB fibres and lower (P < 0.01) CSA of IIB fibres than did the R1 group. The R1 group had significantly greater content of large-sized IIB fibres and smaller content of medium-sized IIB fibres than did the AL group (P < 0.05). The group fed ad libitum had greater backfat thickness and smaller lean meat content and tended to have better meat quality traits compared to the restricted group. The results of this study show that strong feed restriction had a negative effect on muscle fibre composition, especially on the amount of large-sized fibres IIB, which are associated with poor meat quality.

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xxx S. Murtic, J. Jurkovic, E. Basic and E. Hekic
Assessment of wild plants for phytoremediation of heavy metals in soils surrounding the thermal power station
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Assessment of wild plants for phytoremediation of heavy metals in soils surrounding the thermal power station

S. Murtic¹*, J. Jurkovic², E. Basic¹ and E. Hekic¹

¹University of Sarajevo, Faculty of Agriculture, Department of Plant Physiology, Zmaja od Bosne 8, BA71 000, Sarajevo, Bosnia and Herzegovina
²University of Sarajevo, Faculty of Agriculture, Department of Chemistry, Zmaja od Bosne 8, BA71 000, Sarajevo, Bosnia and Herzegovina
*Correspondence: murticsenad@hotmail.com

Abstract:

The present investigation was carried out to evaluate the phytoextraction potential of three main wild plant species: annual nettle (Urtica urens L.), daisy fleabane (Stenactis annua (L.) Ness.) and yarrow (Achillea millefolium L.) that grow spontaneously in heavy metal contaminated areas near the thermal power station in Kakanj, Bosnia and Herzegovina. Analyses of the heavy metal content (Ni, Fe, Cr, Cu, Zn, Cd, Pb, Mn) in soil and plant samples taken from the examined area were performed using atomic absorption spectrophotometry. The results obtained revealed that the examined soils are polluted by Ni and Pb and contain relatively high value of Cr and Fe. Annual nettle, daisy fleabane and yarrow have not shown high efficiency in the absorption and accumulation of heavy metals from polluted soils, and therefore these plants are not be considered as potential phytoremediators of soils on the examined area. Furthermore, the results of the study undoubtedly confirm the fact that the total content of heavy metals in soils is not a sufficient parameter for estimating the toxicity of heavy metals in soils and consequently for their transfer and accumulation in plants.

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