EXTENSION NOTES '
ARTIFICIALLY SIRED. . .
MORE THAN 3&),000 COWS IN U.S. NOW PRO
IXJCE T^ST TORE -CALVES IN PROGRAM THAT HAS
OUTGROWN EXPERIMENTAL STAGE.
Artificial. breeding of cattle, a techniqut
which only a few years ago was still'in
the experimental.state (BW-Nov.30,40,p36),
iias increased during the war years until
now more than 350,000 dairy cows in the
United'States are producing test tube
calves.
TRTDnNT OUESXI.QN-.-Since the rapid devel
opment of this type of breeding has co
incided with the wartime rise in farm in
comes, a pertinent question now. is. whether
artificial insemination would prove- as
popular if farm prices, were to drop toward
'their prewar level. In ordinary'times,the
ffee for such service (usually'$5, or $6..
per'cow) might appear.large to the farmer
who, lacking his own.bullcan employ his
neighbor’sWv^.sira .gratis, or for $1 or
'$2 at most. . . . .
'The semen from one highly productive bull
can be diluted to "service as many ..as
1,500 cows a year, although the average
,is in the neighborhood" of 500. Thus 650
bulls were able to- serve all the cows
that were artificially impregnated in the
(Jnited States in 1944.
ARGUMENTS—Main arguments advanced* in
favor of artificial insemination are
(l) that milk and butterfat production
are increased through use of superior
sires, and (2) that, the ifafmer is thus
feted from the trouble and, in the long
run, expense of maintaining his own herd
bull. It is set. forth that an extra cow
or two can be kept'for what the bull would
cost in investment, feed, and labor. An
other point advanced is elimination of
.e danger of genital disease.
Objections raised by dairymen accustomed
to having their own bull include: (l)that
the cows have to be watehed too closely to
determine the heat period—19 hours at a
maximum, and (S) that i^smore than one' ,
service is' required (two £s the average)
the system begins to become a nuisance and
to cost money in terms of milk production.
! ' \ ' \
It follows, of course, that the. longer the
cow is dry'the greater the ^Ojss olj milk '
production, which make-s it a consequential
matter if impregnation is delayed from
one heat period-to the next—three weeks.
IN 23 STATES—More than 42,000 farms in
23 states now are'breeding battle by the
j laboratory method. In this, of course,
the dairy states lead. Wisconsin was firsi
ini 1944 with 97,344 cows so bred. Now
Jerwey, where the first cooperative for
such breeding was formed'in 1938, was
eighth last year with 15,024 artificially
inseminated 6ows.
CONTINUED on pp. 7.
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