Browsing by Author "Serpa Garcia, Victor Guillermo"

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    Estudio exploratorio sobre la presencia de contaminantes en leche cruda proveniente de la cuenca lechera del Tarqui de la Sierra Sur Ecuatoriana
    (2017) Serpa Garcia, Victor Guillermo
    The present survey aimed to define the presence of contaminants in the raw milk of ten collection centers, with a reception capacity between 2,000 and 10,000 liters, situated in seven cantons of the Province of Azuay. Ninety samples were collected during three visits to each of the collection centers during the months of July and August 2016. In each sample the presence of antibiotics, hydrogen peroxide and neutralizers was analyzed by means of rapid diagnostic tests accredited in the food safety laboratory of AGROCALIDAD, an official institution of quality control. For the detection of antibiotics, a Trisensor® kit with validated sensitivity, applied worldwide, was used to detect and evaluate the level of three antibiotic families: beta-lactams, sulfonamides and tetracyclines, versus the maximum permissible limits in the Codex Alimentarius. The detection of hydrogen peroxide was performed by Test M-Quant™ measuring a range between 0.5 to 25 mg per liter of milk. The presence of neutralizers was determined by the alizarin method according to NTE NTE INEN 10:2012. 141,500 liters of raw milk were analyzed of which 64.7% were not fit for human consumption for the presence of one or more of the studied substances according to the NTE INEN Standard 9:2012 and the Codex Alimentarius. 13.3% of the samples were positive for beta-lactam antibiotics, but sulfonamides and tetracyclines was not detected. Besides 16.4% of the raw milk was adulterated with hydrogen peroxide and 60% with neutralizers.
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    Valoración de dos protocolos de superovulación para la producción de embriones en vacas Holstein
    (2018) Méndez Álvarez, María Silvana; Soria Parra, Manuel Elías; Argudo Garzon, Daniel Ernesto; Torres Inga, Carlos Santiago; Soria Parra, Carlos Alonso; Galarza Lucero, Diego Andrés; Serpa Garcia, Victor Guillermo
    The aim of this paper was to compare the effects of two superovulation protocols: synchronization of the follicular wave (SFW), and natural estrus (NE) induction of embryos produced for transference in Holstein cows. Twenty cows were chosen as donors, with body condition (BC) of 2.75-3.5; 40-60 months old; 1-2 previous services per ges-tation, and without reproductive problems. Two superovulation protocols were applied: SFW and NE. SFW was not observed to produce more embryos than the NE in the blastocyst and morula stages.