Respiration rates and Factors which Influence the levels of Carbohydrates and Lipids in Honey Bee Eggs (Apis mellifera Linnaeus)
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The mean respiration rate for fertilized and unfertilized eggs from queens was 0.1 Â± 0.0 ÂµL CO2/hr/egg, the same as the mean respiration rate obtained for unfertilized eggs from laying workers. The results of carbohydrate analysis showed a total of 2.4 Â± 0.6 Âµg/egg total sugars in the fertilized eggs of queens, an equivalent of 8.3% on a dry weight basis, while unfertilized eggs contained a total of 1.4 Â± 0.4 Âµg/egg total sugars, equivalent of 6.3% on a dry weight basis. Total lipids, excluding fatty acids, were 10.7 Â± 6.1 Âµg/egg (37.4%) for fertilized eggs and 8.4 Â± 1.3 Âµg/egg (40.8%) for unfertilized eggs.
The respiration rate at 34oC was 0.17 Â± 0.01 ÂµL CO2/hr/egg on day 1, the same as day 1 at 36oC. Day 2 respiration rates were 0.13 Â± 0.04 ÂµL CO2/hr/egg and 0.15 Â± 0.01 ÂµL CO2/hr/egg, respectively. On day three, 0.22 Â± 0.01 ÂµL CO2/hr/egg was recorded at 34oC and 0.24 Â± 0.01 ÂµL CO2/hr/egg at 36oC. At low temperatures of 28oC and 31oC, a respiration rate of 0.12 Â± 0.01 ÂµL CO2/hr/egg was recorded on day 1, for eggs held at both temperatures. Day 2 results were 0.07Â± 0.01 ÂµL CO2/hr/egg at 280C and 0.11 Â± 0.01 ÂµL CO2/hr/egg at 31oC, while 0.07 Â± 0.01 and 0.12 Â± 0.01 ÂµL CO2/hr/egg, respectively, were measured on day 3. Mortality results, as indicated by pre-emergence embryos, showed that 75% developed at 34oC compared to 37.5% at 36oC. Low temperatures of 28oC had 12.5% developing to pre-emergence stage while 50% developed at 31oC.
Respiratory results showed significant differences (p=0.05) between the different days of incubation and temperature treatments, respectively. No significant difference was observed between the fertilized eggs and unfertilized eggs from queens at the same temperature treatment. The comparison of unfertilized eggs from queens and those from laying workers also showed no significant difference. The regression (R2=0.65) was significant (P=0.05) when CO2 output on all the days and temperature treatments were compared.
The amount of nutrients in the eggs of queens and those of laying workers, were significantly different (P=0.05) depending on egg type and age. No significant difference was observed between the colonies headed by queens or those of laying workers. Although the queen-laid eggs showed a relatively higher mean value for carbohydrates than worker-laid eggs, the reverse was the case for lipids. On comparing the amount of nutrients per unit weight for queen-laid and worker-laid eggs, no significant differences were observed. From the results obtained, inferences were made about the natural differences between the eggs from queens, and those produced by laying workers.
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