Frank:

Regarding cross-breeding [“interracial marriage”], the eminent monk has
the following to add to Carnies:

I [Brother Adam] must mention one point here: where there is a question of
a general 'utility' cross with this race of bees, Carniolan drones should
be used in every case.  A reciprocal cross - Carniolan queens mated with
drones of other races - produces very often a bad tempered bee and at the
same time a first-cross of little or no economic value.  Heterosis
intensifies the hereditary swarming tendency to an even greater degree
than is normally the case.  The result is that such a first-cross expends
all its strength in its craze for swarming.  Yet in the next and
subsequent generations there is a marked decline in the swarming tendency,
which allows for the full development of those characteristics which have
a direct bearing on honey production, while at the same time there is a
greater fecundity, often to a far higher degree than is apparent in the
original parent stock.”

See for yourself [copy and paste]:

http://www.fundp.ac.be/~jvandyck/homage/books/FrAdam/breeding/partIII85en.h
tml#p10


Yoon

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