Processing time of three kinds of bee pollen in the digestive tract of Apis mellifera L.
Author of the article:WANG Ying;MA Lan-Ting;LIU Zhen-Guo;WANG Hong-Fang;XU Bao-Hua
Author's Workplace:Department of Science and Technology, Shandong Agricultural University, Tai’an 271000, China; College of Animal Science and Technology, Shandong Agricultural University, Tai’an 271000, China
Key Words:Apis mellifera L.; bee pollen; digestive tract; emptying time
Abstract:
[Objectives] To determine the processing time of Camellia pollen, rape pollen
and corn pollen, in the bee digestive tract. [Methods] Honeybees
were fed either Camellia pollen, rape pollen or corn pollen, containing
a Cr2O3 marker. Three, six and nine day old honeybees
were prevented from feeding for 0, 24, 48 and 72 h, respectively, after which
their digestive tracts were dissected for examination. The emptying rate of the
digestive tract, food intake and the length of the midgut, ileum and rectum of
each treatment group was compared. [Results] With the exception of 3-day-old bees fasted
for 24 hours, 6-day-old bees fasted for 0 and 24 hours, and 9-day-old bees
fasted for 48 hours, there were significant differences in the emptying rate of
the digestive tract among the treatment groups (P < 0.05). The
digestive tracts of all treatment groups were completely empty after fasting
for 72 h. Although the total consumption of corn pollen was significantly lower
than that of Camellia and rape pollen (P < 0.05), there was no
significant difference in the total food intake of each treatment group at the
end of the experiment (P > 0.05). There was also no significant
difference in the length of the midgut and rectum of the different age groups,
and the influence of diet on ileum length was small. [Conclusion] The digestive tract of honeybees < 9 days old
empties within 72 h, irrespective
of the kind of bee pollen ingested.