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National Repository of Grey Literature 2 records found  Search took 0.00 seconds. 
Iodine content in the pool samples milk
 SOJKOVÁ, Lada
Abstrakt The work deals with the content of iodine in pools samples cow's milk. It provides information about the content of iodine in the Czech Republic within years and districts. Milk was obtained in collaboration with Madeta a.s. Iodine was subsequently determined by spectrophotometry after alkaline combustion of the sample (Sandell-Kolthoff method). A total were evaluated of 149 samples milk (2013-2015). In 2013, the average iodine content in bulk milk samples 289,3 gl-1. In 2014, the average iodine content in bulk milk samples 222,2 microgram.l-1. In terms of food source of iodine in the milk TRÁVNÍČEK et al. (2011) reported the optimal value for the content of iodine in the milk of between 100 to 200 microgram.l-1. The results are thus slightly higher than the optimum. Within the districts was found the highest average in 2013 in the district of Tábor (398,0 microgram.l-1). The highest average content measured in 2014 was found in the district Prachatice (357,0 microgram.l-1), while the lowest average value measured was found in the district Třebíč (163,0 microgram.l-1).
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Insemination of Honey Bee Queens
 SOJKOVÁ, Lada
Instrumental insemination honey bee queen is in Czech Republic only possibility, how make controlled mating bees. Main significance lies in expanding desirable feature in the bee colony. Instrumental inseminations are thus obtained the required feature, that are the mildness of bees, sitting on the comb, or resistance to disease. Insemination must precede controlled breeding drones and controlled breeding queens. That drones were sexually mature at the time of insemination must be breeding drones initiated about 40 days before breeding queens. Hatched queens are inseminated 5th -7th day after hatching by sperm of several drones because they are polyandrous. For the insemination of one queen is necessary 8-12 mm3 of sperm. This volume corresponds 10-12 drones. Sperm is collected drones about 30 minutes before insemination. Sucks into the inseminated needle, after that injects a sperm into the queen's genital tract of queen. The most difficult task is eliminate of vaginal valve that prevents the injection of sperm. The queen bee is fertilized 1 × for a life. The obtained sperm are stored in the spermatheca of queen. The quantity of sperm in the spermatheca determines the length of stay queen in the bee colony. After emptying the sperm from the spermatheca queen lays unfertilized eggs, from which develops a drones. Honey bee queen becomes drone-laying queen and causes an imbalance of bee colony.
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5 Sojková, Lucie
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