Santa Rosa del Sur, Colombia

Time filter

Source Type

Ceron-Munoz M.F.,University of Antioquia | Agudelo-Gomez D.A.,Lasallista University Corporation | Ramirez-Arias J.P.,University of Antioquia
Livestock Research for Rural Development | Year: 2017

The aim of this study was to determine the reproductive seasonality of buffalo cows. A total of 7669, 14218, 7811 and 9136 records of first, second to third, fourth to five and over five calving, respectively were analyzed. Births occurred between 1999 and 2014 in six buffalo system farms. A generalized additive model with smoothness with binomial distribution of births occurrence in a particular day of the year was used. There was tendency to calving seasonality. More than 45% of the first-born females were calving between June and September, and in the case of females of more than one birth, more than 65% of calving occurred between August and December. However, it was reported births at different times through the year. It is concluded that exist a marked seasonal pattern for buffalo cows calving in Colombia, corresponding to more than 65%, between August and December. © 2017, Fundacion CIPAV. All rights reserved.

Ruales C.A.D.,Lasallista University Corporation | Torres W.V.,University of the Plains
Revista Colombiana de Ciencias Pecuarias | Year: 2014

Background: ammonia (NH3) is the main excretion product from protein catabolism in fish, eliminated primarily through the gills. The proportion excreted by each species depends on factors such as protein quality, energy level and diet balance, body size of the animals, and environmental factors such as water temperature and pH. Objective: to determine the effect of dietary protein level (D1 = 250 g/kg, D2 = 300 g/kg, D3 = 350 g/kg) and body weight (P1 = 45 g, P2 = 250 g, P3 = 520 g) on ammonia excretion (AE) in white cachama (Piaractus brachypomus). Methods: basal AE level was determined by measuring water ammonia concentration every 2 h for 26 h after a 48 h fasting period. The AE in response to CP levels was determined for each fish size by measuring ammonia every 2 h for 26 h, after feeding them to satiety with the experimental diets. Results: basal AE was 177.2, 128.7, and 79.2 mg N-NH4+/day/kg live weight (LW) for P1, P2, and P3, respectively. The differences between treatments were significant (p<0.05). The AE rate, depending on protein level and body weight, was significantly different for all comparisons (p<0.05), similar to the comparison of main effects. Conclusion: the lightest fish and the highest protein content intake increased ammonium excretion.

Villa J.A.,Ohio State University | Villa J.A.,Florida Gulf Coast University | Villa J.A.,Lasallista University Corporation | Mitsch W.J.,Ohio State University | And 3 more authors.
Ecological Engineering | Year: 2014

Carbon stable isotopes were used to investigate the contribution of different wetland plant communities commonly found in the Everglades to the dissolved organic carbon (DOC) exported from a mesocosm experiment. The species conforming the different treatments in the mesocosms were: Typha domingensis Pers, Cladium jamaicense Crantz, Nymphaea sp., Nymphaea sp./. Eleocharis sp., Najas guadalupensis [Spreng] Magnus/. Chara sp. and Najas guadalupensis. Results indicate that Nymphaea sp./. Eleocharis sp. and Najas guadalupensis/Chara sp. treatments functioned as temporary sinks for DOC, but over the study period all treatments were net sources of DOC. A two-source carbon isotope mixing model was used to estimate the contribution from inflow water and biomass into the outflow DOC in each treatment. DOC from biomass was relatively higher in treatments with emergent and floating vegetation (24-30%) than in treatments containing submerged aquatic vegetation (≤5%). The relevance of these findings for restoration and management in the context of the Everglades region, specifically its implications for organic phosphorus exports, are discussed. © 2014 Elsevier B.V.

Manrique-Moreno M.,University of Antioquia | Londono-Londono J.,Lasallista University Corporation | Jemiola-Rzeminska M.,Jagiellonian University | Strzalka K.,Jagiellonian University | And 3 more authors.
Biochimica et Biophysica Acta - Biomembranes | Year: 2014

This report presents evidence that the following Solanum steroids: solasodine, diosgenin and solanine interact with human erythrocytes and molecular models of their membranes as follows: a) X-ray diffraction studies showed that the compounds at low molar ratios (0.1-10.0 mol%) induced increasing structural perturbation to dimyristoylphosphatidylcholine bilayers and to a considerable lower extent to those of dimyristoylphosphatidylethanolamine; b) differential scanning calorimetry data showed that the compounds were able to alter the cooperativity of dimyristoylphosphatidylcholine, dimyristoylphosphatidylethanolamine and dimyristoylphosphatidylserine phase transitions in a concentration-dependent manner; c) in the presence of steroids, the fluorescence of Merocyanine 540 incorporated to the membranes decreased suggesting a fluidization of the lipid system; d) scanning electron microscopy observations showed that all steroids altered the normal shape of human erythrocytes inducing mainly echinocytosis, characterized by the formation of blebs in their surfaces, an indication that their molecules are located into the outer monolayer of the erythrocyte membrane. © 2013 Elsevier B.V.

Agudelo-Gomez D.A.,Lasallista University Corporation | Agudelo-Trujillo J.H.,University of Antioquia | Ceron-Munoz M.F.,University of Antioquia
Livestock Science | Year: 2016

Genetic parameters and breeding values from unitrait, multitrait, and reduced principal component models for weaning weight, yearling weight, weight at 18 months, weight at two years, age at first calving, milk yield, and maternal genetic effects for weaning weight and yearling weight were estimated for dual purpose buffaloes in Colombia. With those values we constructed selection indices (SI) and estimated genetic progress obtained through mating-modeling under various selection criteria and weighted values for each trait. Comparison of SI was performed using duality diagrams in principal components of breeding values obtained by pseudo-simulation of mating with animals selected with the constructed SIs. The index constructed with the first principal component of the reduced range model led to improved meat, milk yield, and age at first calving. © 2016 The Authors

Herrera O L.,University of Antioquia | Rios O L.,University of Antioquia | Zapata S R.,University of Antioquia | Zapata S R.,Lasallista University Corporation
Revista MVZ Cordoba | Year: 2013

Objective: To determine the frequency of gastrointestinal nematode infection in goat and sheep folds of some municipalities of Antioquia. Materials and methods: A cross-sectional descriptive study was carried out between February and June 2011 in fecal samples of 84 goats and 11 sheep between 2 and 132 months of age in six folds in Antioquia. The number of eggs per gram of feces (epg) was determined using the McMaster technique, and the 3rd larval stage was obtained by means of Corticelli and Lai technique. For larval gender identification, gastrointestinal nematode taxonomical keys for goats and sheep were used. Tricostrongilides infection frequency and its association with epidemiological data was measured by means of chi-square test and comparison of proportions by column with Z test and U of Mann-Whitney contrast test. Results: Nematode infection frequency was 86.6% and Haemonchus contortus (66.3%), Oesophagostomum spp (38.9%), Trichostrongylus spp (34.7%) and Ostertagia spp. (24.2%) were the most prevalent nematodes. A statistically significant difference was found between infected and non-infected proportion per animal breed. Conclusions: There are differences between infection frequencies in Camuro, La mancha and Toggenburg breeds compared with other breeds in the same folds. These differences can be related with resistance and/or recovering from infection, but more research focused in mechanisms of action in goats and sheep of Antioquia is necessary.

Narvaez V J.F.,University of Antioquia | Jimenez C C.,Lasallista University Corporation
Vitae | Year: 2012

Pharmaceuticals and personal care products have become an environmental problem in recent years. Their physicochemical properties and persistence in the environment have allowed the distribution of degradates and parent compounds in water, soil, air and food. The widespread use of pharmaceuticals and personal care products in hospitals, domestic residences, agricultural and industrial facilities has increased their discharge into the water bodies, and its toxicity has started to manifest in different biological components of ecosystems. The development of methods for sample treatment and instrumental analysis techniques has enabled the separation, identification and quantification of active ingredients and degradates with higher environmental impact, at concentrations of parts per billion or even parts per trillion. In addition, in vitro and in vivo assays have demonstrated their ecotoxicity in water, driving them to the classification of emerging organic pollutants, whose waste is indeterminate. Although their adverse effects are still unknown, they could have strong implications for global public health. This review presents the dynamics and the development of research over the past ten years about the presence of non-steroidal anti-inflammatory analgesics, antihypertensives, antibiotics and other drugs in water bodies. Similarly, it described the impact of pharmaceutical activity, hospital services and domestic effluents on water quality.

Objective. Quantifying phenotypic malformations and make a curve control and development of the breed Poodle puppies in the city of Medellin. Materials and methods. We analyzed 60 individuals, 30 females and 30 males were measured and weighed from 2 to 12 months of age with these data, build a table and a control growth curve and after about 12 months of age there were the Phenotypic malformations, which are considered by the American Kennel Club (AKC) and Cynological International (FCI). Results. Of the specimens analyzed, 10% had bone spurs, cryptorchidism 20%, 5% had polidoncia a year old, with teeth retained teeth more often. Conclusions. In an effort to find examples of smaller faults have been committed at the time of mating, resulting in increased phenotypic malformations found in the study, this work also provide veterinarians, another tool for assessing pediatric puppies Poodle race in the city of Medellin.

Cartagena C.J.,Lasallista University Corporation
Revista Lasallista de Investigacion | Year: 2011

Waste materials from pharmaceutical products are an environmental problem due to their persistence and distribution in water, soil, air and food. The use of those products in hospitals, veterinarian clinics and homes, increase their discharges and also those of their transformation products into the environment and their toxicity affects life in ecosystems. The development of sample treatment methods and instrumental analysis techniques have allowed their low concentrations monitoring throughout all of the components of aquatic, ecosystems, the soil and their biomagnifications in food chains. Likewise, in vitro and in vivo tests are made to determine their ecotoxicity, classifying them as emerging pollutants which discharges are not accountable, but which impact on ecosystems is chronic and highly harmful for health worldwide. This revision gathers research works made during the last 10 years concerning the presence of some pharmaceutical products in water bodies and also warns about the impact of pharmaceutical activities on environment.

Background: Antioxidants have been one of the commercial concepts with highest impact in functional food market; however, their statement turns out a controversial topic among regulatory agencies worldwide, due to the complexity involved in demonstrating the presence and bioactivity of these antioxidants in the food. In this context, recent researches have attributed antioxidant properties to coffee beverages. Objectives: The aim of this work was to determine by in-vitro methods that coffee beverages contain phenolic substances, which may act as antioxidants, as well as evaluate how this activity can vary over time. Methods: 48 Coffee products were evaluated at two storage time conditions, namely, at the beginning and the end of their shelf life, determining the total phenolic content and their antioxidant activity by ABTS (radical capture of 2, 2 '-azino-bis-(3-ethyl benzotiazolin -6 - ammonium sulfonate) and DPPH (Capture the radical 2,2-diphenyl-1-picrilhidracilo); FRAP was also determined to know the ferric iron reducing activity. The objective of the above was to establish the content of phenolic antioxidant to be declared on the label. Results: The content of antioxidant polyphenols was different depending on the coffee type; the content was 328.61 ± 31.35 and 297.17 ± 68.48 mg gallic acid equivalents per 100 mL of beverage in roasted and soluble coffees respectively. The results obtained by the methods of ABTS, DPPH and FRAP showed through a principal components analysis that they are correlated with each other and that the storage time has an effect on the antioxidant activity of the products. Additionally, the ex-vivo antioxidant capacity was evaluated on two samples, roasted and soluble coffee beverages by the lipid peroxidation assay of the Low Density Lipoprotein (LDL); it was found that coffee beverages prevent the LDL oxidation, according to the results of polyphenols contents. Conclusions: The results allowed establishing the specifications of the content of antioxidants in coffee products to be declared on the label. This study shows that with these analysis methods the bioactivity of coffee products and its stability over time can be demonstrated.

Loading Lasallista University Corporation collaborators
Loading Lasallista University Corporation collaborators