Hi all
There is research done on acidification of syrup fed to hives. Whether it can be repeated by others, is the issue.

In order to determine the effect exerted by
acidifying substances (apple vinegar and lactic
acid) on bee family development in the spring
season, we measured the number of cells with 
brood bees at 7, 14 and 21 days after the administration.

The group LE1, fed with supplementation of
apple vinegar 12.5 ml, recorded a number of
cells with brood bees that was bigger with 5690
in comparison with the control variant.

The group LE2, fed with sugar syrup with
incorporation of 1.5 ml lactic acid, recorded a
number of cells that was with 4700 bigger
compared with the control variant.

21 days after administration of sugar syrup with
incorporation of acidifying substances, there were
significant differences between the control variant
and the experimental variants (table 7) as regards the
number of cells with brood bees; the biggest
differences were observed in the variant fed sugar
syrup with incorporation of apple vinegar

The acidifying substances determined the
increase of the number of cells with brood bees
and at the same time the amount of working bee
with about 1 kg. This fact is reflected upon bigger
honey productions / family and that is why I
recommend the utilization of these.

Pătruică S. et. al. Scientific Papers: Animal Science and Biotechnologies, 2011, 44 (2) 
Research on the Effect of Acidifying Substances on Bee Families Development and Health in Spring

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