The best dose was 6.25 milh- ed per cow. Half that dose prO'
~ «' FSH ’ p“»“V^uKo7e o p^«-
Multiple Births Mean More Beet
12—Lancaster Fanning. Saturday. April 5. 1960
The average beef cow th.ittion. physiologists floated 61
conceived aftei an experimental beef heifeis, 2 and 3 yeais old.
hoi mono tiealmcnl weaned 111 with tolhclc stimulating hoi
c .,l\cs —up fiom 085 normally mone (FSH) obtained fiom
i ecoi tied in good beef heids pituitary glands of sheep and
The tieatod cows weie pail hoises FSH stimulates the
ot a piactical expenment at ovary to pioduce eggs '
Foil Reno Livestock Expeu The sday treatment of two
ment Station, El Reno, Okla, injections daily was stalled on
to tiy out available techniques the eighth day of estious,
foi inducing multiple births
Cooperating in the tual weie
livestock icseaichers E J Tin
man ol Oklahoma State Uni
veisitv and R E Renbaigerand
D F Stephens of ARS
Thev injected 81 beef cows
with piegnant mare seium
(PMS) a substitute foi the na
tuial hoi mone (follicle stimu
lating FSH) that stimulates the
ovaiy to pi oduce eggs Cows
weie injected twice dunng
the eailv and the late paits ot
the estious cycle Then at the
end of the cycle, they weie in
jected with choi ionic gonado
tiophin to assure ovulation, that
as shedding of each egg
At the fust mating following
hoi mone tieatment, 52 cows
conceived Counting only off
spnng that suivived 1 month,
they pioduced 29 single calves,
12 sets of twins 8 sets of tnp
lets 2 sets of quadiuplets, and
1 set of quintuplets In future
tuals the scientists hope to in
ci ease the numbei of twins and
ti iplets without getting quads :
and quints, which present speci-1
al management pioblems
Multiples were lightei at
bnth than single calves Twins
and tnplets aveiaged 55 pounds,
and quads and quints aveiaged
34 pounds compaied with 83
pounds foi single salves
Light bnth weight could be
accounted foi, in pait, by leng
th of gestation It ranged fiom
277 days foi twins to 258 days
foi quints compaied to 281 days
foi single calves
At weaning, twins and triplets
aveiaged 374 pounds, quads and
quints 332 pounds All weie
geneially laised as twins, using
piovidmg access to feed
Singles, laised as singles with
out feed, aveiaged 462 pounds
This shows leseaicheis empha
size, that offspnng of the avei
age cow with multiple calves
pioduced 746 pounds of beef at
weaning moie than iv 2 times
the output of 462 pounds lecoid
ed foi cows with single off
spnng
But icsults, while encourag
ing, laise a numbei of practi
cal pioblems
Fust 48 peicent of cows with
multiple calves did not expel
then placenta natuially, com
paied to 2 01 3 peicent in the
noimal heid
Second, 25 percent of the
cows laising twins did not le
bieed, peihaps in pait because
of the heavy stiess on cows
laising twins Fuithei, these
cows did not leally have enough
milk foi two calves Both piob
lems may be solved by ciossing
beef bieeds with dany cattle
Thu d, the treatment is costly
in matenals and labor Puce of
hoimones, now about $7 per
cow tieated, must be reduced by
new, cheapei, masspioduced
hoimones oi hoimone substi
tutes Labor costs may come
down when leseaich now undei
way peimits woikers to com
bine tieatments foi multiple
bnths with tieatments for es
tious synch) omzation Synchro
nized cows can be treated and
managed as a herd rather than
as individuals
Scientists at Foit Reno and
othei stations will chip away at
these diawbacks because the
potential of multiple calves is
undeniable, paiticulaily when
viewed fiom the standpoint of
calves weaned per cow
To get a basic idea of how
hoimone dosage affects ovula-
HarißißaiiMMMHiiaiiii
SMOKETOWN
which had been synchronized by
feeding progesterone Heifers
were bred nalmally as they
came into heat Sixty to 72
hours later, results of the entire
piocedure were checked by
suigically examining the ovary
and collecting eggs that were
shed
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