Diana Lorena Marentes Barrantes



LÍNEAS DE INVESTIGACIÓN:   Mercadeo Agropecuario, Agronegocios, Economía Agraria

FACULTAD:  Ciencias Ambientales e Ingenierías


NIVEL DE FORMACIÓN: Maestría/Magister


Technical and administrative characterization of small-holder milk production systems in a central region of Colombia
Fecha de publicación: 30/07/2018

The objective of this work was to carry out the technical-administrative characterization of smallholder of milk production systems located in the village of El Peñón, in the town of Sibaté/Colombia. The study was carried out during the months of November/2016 to April/2017. The information was obtained through semi-structured interviews with 18 producers. For the identification of the systems, technical-productive variables were investigated and the characterization included the analysis of components: a) Location, biophysical aspects, landscape, use and land management; b) Forage resources and food; c) Animal resources; d) Reproduction and health; e) Milk production, livestock marketing and business management; f) Handing, infrastructure and equipment; and g) Owner information. A cluster analysis and multiple correspondences analysis using the statistical package SAS (Statistical analysis system, version 9.4). The results of the cluster analysis were shown the conformation of 8 groups classified as: specialized dairy, semispecialized, smallholder and small farm given to heterogeneity of the productive model. Five smallholder systems were identified, the analysis of multiple correspondences showed a relationship between qualitative variables and components evidencing a technological model based on a semi-intensive production with adequate infrastructure and acquisition of low cost technology with low validated feeding strategies. The use of low genetic quality animal resources with reduced implementation of breeding programs and reproductive biotechnologies and healthy plans and the lack of practices of animal welfare and good milking practices. Additionally, limited marketing networks and business management strategies. In conclusion, the systems are developed in heterogeneous conditions, which is due to the formulation of different production models. The characterization of smallholder systems is necessary to identify technological recommendations and the intervention of policies for the improvement and strengthening of productive systems

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Heart rate variability, salivary cortisol and competitive state anxiety responses during pre-competition and pre-training moments
Fecha de publicación: 01/02/2019

The study aimed to investigate physiological and psychological states prior to competition and prior to training in three different demanding activities. Eighteen canoe athletes, 18 street runners and 18 jiu-jitsu fighters were included in this study (n=54). The Competitive State Anxiety Inventory-2 (CSAI-2), salivary cortisol and heart rate variability (HRV) were measured at two time points (pre-training and pre-competition). Somatic anxiety (F1,42 = 15.29, p = 0.0003), HRV (F1,42 = 23.24, p < 0.0001) and salivary cortisol (F1,42 = 22.96, p < 0.0001) were significantly greater at the pre-competition measurement point than at the pre-training point, but without a main effect of the type of athlete on these variables. A main effect of the type of athlete was found on somatic anxiety (F2,42 = 6.58, p = 0.0033), cognitive anxiety (F2,42 = 10.69, p = 0.0002) and self-confidence (F2,42 = 5.42, p = 0.0080). Correlations between most CSAI-2 and physiological parameters were not significant (p > 0.05). In conclusion, the results indicated that both emotional indices and psychophysiological indices of stress are higher before competition than before training, with differences between emotional states between these sports. Although correlations between emotional states and psycho-physiological states before competition and before training were largely non significant, these findings reinforce the importance of psychological monitoring of athletes in association with traditional physiological markers such as cortisol and HRV in sportive training programmes as complementary resources to improve both competition performance and the training routine.

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