Van Opstal J.D.,Utah State University |
Neale C.M.U.,Utah State University |
Neale C.M.U.,University of Nebraska - Lincoln |
Lecina S.,Research Center cnologia Agroalimentaria Of Aragon
Proceedings of SPIE - The International Society for Optical Engineering | Year: 2014
Irrigation system modelling is often used to aid decision-makers in the agricultural sector. It gives insight on the consequences of potential management and infrastructure changes. However, simulating an irrigation district requires a considerable amount of input data to properly represent the system, which is not easily acquired or available. During the simulation process, several assumptions have to be made and the calibration is usually performed only with flow measurements. The advancement of estimating evapotranspiration (ET) using remote sensing is a welcome asset for irrigation system modelling. Remotely-sensed ET can be used to improve the model accuracy in simulating the water balance and the crop production. This study makes use of the Ador-Simulation irrigation system model, which simulates water flows in irrigation districts in both the canal infrastructure and on-field. ET is estimated using an energy balance model, namely SEBAL, which has been proven to function well for agricultural areas. The seasonal ET by the Ador model and the ET from SEBAL are compared. These results determine sub-command areas, which perform well under current assumptions or, conversely, areas that need re-evaluation of assumptions and a re-run of the model. Using a combined approach of the Ador irrigation system model and remote sensing outputs from SEBAL, gives great insights during the modelling process and can accelerate the process. Additionally cost-savings and time-savings are apparent due to the decrease in input data required for simulating large-scale irrigation areas. © 2014 SPIE.
Panea B.,Research Center cnologia Agroalimentaria Of Aragon |
Catalan A.,Research Center cnologia Agroalimentaria Of Aragon |
Olleta J.L.,University of Zaragoza
ITEA Informacion Tecnica Economica Agraria | Year: 2010
Thirteen animals from two different genotypes, Holstein (dairy) and Pirenaica (beef), were used to study breed and endpoint temperature effects on some meat textural characteristics. Steaks from L. thoracis were randomly distributed into raw, 55°C and 70°C of internal temperature treatments, cooked in a water bath and tested. Shear force, stress and toughness in the Warner-Bratzler test and maximum compression load, stress at 20% and stress at 80% in compression test were recorded. Statistical analysis consisted on a GLM procedure with main effects and Pearson correlations between variables. Breed is an important factor on meat texture characteristics, but endpoint temperature was more important than breed. There were no interactions between main effects. Meat from the dairy breed was tougher than meat from beef breed. The increase of toughness with the increase of temperature was no linear, being greater in raw to 55°C step than in 55°C-70°C phase.
Sanz A.,University of Zaragoza |
Ordovas L.,University of Zaragoza |
Zaragoza P.,University of Zaragoza |
Sanz A.,Research Center cnologia Agroalimentaria Of Aragon |
And 2 more authors.
Meat Science | Year: 2012
Controlling meat traceability using SNPs is an effective method of ensuring food safety. We have analyzed several SNPs to create a panel for bovine genetic identification and traceability studies. One of these was the transversion g.329C. > T (Genbank accession no. AJ496781) on the cytochrome P450 17A1 gene, which has been included in previously published panels. Using minisequencing reactions, we have tested 701 samples belonging to eight Spanish cattle breeds. Surprisingly, an excess of heterozygotes was detected, implying an extreme departure from Hardy-Weinberg equilibrium (P<0.001). By alignment analysis and sequencing, we detected that the g.329C. > T SNP is a false positive polymorphism, which allows us to explain the inflated heterozygotic value. We recommend that this ambiguous SNP, as well as other polymorphisms located in this region, should not be used in identification, traceability or disease association studies. Annotation of these false SNPs should improve association studies and avoid misinterpretations. © 2012 Elsevier Ltd.
Socias I Company R.,Research Center cnologia Agroalimentaria Of Aragon |
Kodad O.,Research Center cnologia Agroalimentaria Of Aragon |
Fernandez I. Marti A.,Research Center cnologia Agroalimentaria Of Aragon |
Alonso J.M.,Research Center cnologia Agroalimentaria Of Aragon
Collectanea Botanica | Year: 2013
The examination of the allelic diversity of the locus S in ten almond cultivars from Majorca has shown the presence of the Sf allele in four of them, as well as the presence of five new alleles non identified so far. Although the Sf allele has been described as responsible for the expression of self-compatibility in almond, it has been recently shown that this allele has two different phenotypic expressions. As a consequence, this allele cannot be always considered an index for self-compatibility of the genotypes harbouring it. The study of the four Majorcan cultivars possessing this allele has confirmed their selfincompatibility, showing that this allele is in its phenotypically active form, as it has been also observed in a group of cultivars from southern Italy, a fact possibly suggesting a connexion between these two Mediterranean almond populations.
Blanco M.,Research Center cnologia Agroalimentaria Of Aragon |
Joy M.,Research Center cnologia Agroalimentaria Of Aragon |
Alberti P.,Research Center cnologia Agroalimentaria Of Aragon |
Ripoll G.,Research Center cnologia Agroalimentaria Of Aragon |
Casasus I.,Research Center cnologia Agroalimentaria Of Aragon
Italian Journal of Animal Science | Year: 2014
This paper studies the performance and carcass quality of Parda de Montaña cattle under different management systems to find alternatives to concentrate feed indoor beef production. Treatments were: i) Control, with 8 bulls (216±34.3 kg initial weight; 282±45.6 days) fed concentrate and straw ad libitum during winter housing period until reaching 500 kg; ii) G-supp, with 8 steers (204±31.2 kg initial weight; 271±47.5 days) fed a total mixed ration (TMR) (50% alfalfa hay, 10% straw, 40% corn) ad libitum during winter housing period (from mid-April steers rotationally grazed on a mountain meadow supplemented with 1.8 kg dry matter corn/d until reaching 500 kg); iii) TMR, with 8 steers (200±42.5 kg initial weight; 261±39.0 days) managed as G-supp steers until mid-July, when they were housed and fed TMR ad libitum until reaching 500 kg. Control bulls had 45% greater weight gain than TMR and G-supp steers during housing period (P<0.001). In the finishing period, TMR had 31% greater weight gain than steers finished on pasture (P<0.01). At slaughter, Controls were 97-127 days younger than others (P<0.001). Steers finished on TMR had worse conformed carcasses, greater fat and fewer edible meat proportions than G-supp and Control (P<0.01). Total cost of TMR and G-supp was greater than Control, with a similar income for G-supp and Control. TMR steers were paid less because of their worse carcass quality. Hence, finishing of steers on pasture with a supplement can be a feasible alternative to fattening bulls on concentrates, depending on the relative availability and price of feedstuff. ©Copyright M. Blanco et al., 2014.