Journal of Apicultural Science

Effect of period of the season and environmental conditions on rate of cleaning cells with dead brood

Journal of Apicultural Science. Volume 53, Issue 1, Pages 95-103, ISSN (Print) 1643-4439
The study was done in the years of 2004, 2005 and 2007 in carniolan bee colonies, of Zosia line. The hygienic behaviour of bee colonies with assays of freeze-killed brood was measured. In 2007 the hygienic behaviour of colonies was related to the weather conditions and natural honey flow.
Some differences were found in the removal rate of dead brood during the experiment. In the first 12 hours after the brood was killed a significantly lower percentage of cleaned cells was observed in the year of 2005. After 3 days of cleaning, bees removed a significantly higher percentage of freeze-killed brood in 2007 than in 2004 and 2005. Some differences were found also in the rate of cell cleaning in particular periods of the season. During the first 12 hours after the brood was killed, bees removed the least freeze-killed brood in May. In the first three days, after the brood was killed, bees cleaned the highest percentage of dead brood in June and August.
No correlation was found between cell cleaning rate and average air temperature and air humidity. Also the nectar income on the day of measurement did not affect the rate of dead brood removal. However the nectar income on the day before the measurement of the cleaning rate, affected positively the number of removed dead brood.
hygienic behaviour, period of the season, environmental conditions
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