GOAT PREGNANCY TESTING
MOUNTAIN INSTRUMENTAL LABORATORIES
and ovarian function in dry or lactating goats can be determined by a rapid,
inexpensive, laboratory test for the hormone "progesterone."
Only a small amount of milk or
blood is needed. Milk must be stabilized with a preservative prior
to sending the sample to us. We supply the preservative. It
is the standard DHIA preservative. Use mid-collection milk, not strippings.
Results are available the day
after we receive the sample.
Samples may be sent by USPS First
Class Mail. We supply sturdy, plastic (not glass) sample tubes for milk
or blood. Please use a padded envelope, not a regular envelope.
Regular envelopes are torn open by the USPS automatic canceling machines.
WHY THE PROGESTERONE TEST
A Corpus Luteum (CL) forms in
the ovaries after ovulation. This CL produces the hormone "progesterone."
The progesterone concentration remains high (more than 1.5ng/mL) throughout
In a non-pregnant doe, the CL is
reabsorbed prior to the next estrus, decreasing the progesterone concentration
to 0.1ng/mL or less.
WHAT THE RESULTS MEAN:
A low progesterone concentration
(0.1ng/mL or less) more than a few days after breeding indicates that the
does is not pregnant. A doe cannot carry a fetus to term with a low
A high progesterone concentration
(more than 1.5ng/mL) in a normal doe 19-24 or 44-48 days after breeding
indicates that the doe was pregnant at the time that the sample was taken.
WHAT PROBLEMS MAY OCCUR:
Incorrect estimation of the time
of estrus and ovulation, embryonic loss, and various ovarian disorders
all can produce a "false positive" result. The pregnancy test sample
should be collected when the doe normally should come back into heat, whether
she shows signs of heat or not.
ADDITIONAL USES FOR PROGESTERONE
A series of progesterone tests
can be used to determine whether the doe is cycling. The progesterone
concentration will cycle along with the estrus cycle.
Silent heat can be detected, since
the progesterone level should always be low during estrus and at ovulation.
A low progesterone concentration is necessary for ovulation to occur.
A doe who is not about to ovulate,
even though she shows signs of heat, can be identified because the progesterone
level will be too high to be compatible with ovulation.
In a pregnant doe, the probability
of multiple kids increases as the progesterone level increases. For
example, a doe with a progesterone level of 2.2ng/mL at 19 days post breeding
should have only one kid. A doe with a progesterone concentration
of more than 10ng/mL may have 1, 2, 3, or 4 kids, depending upon how many
ova were fertilized and how may embryos survive.
We also offer other endocrine
tests to help your veterinarian in the evaluation of any reproductive
Progesterone testing has been
found to be 98-99% accurate in predicting that a doe IS NOT
PREGNANT, because a doe with a very low progesterone concentration (0.1ng/mL)
more than a few days after ovulation, cannot carry a fetus to term.
However, a high progesterone concentration (1.5ng/mL or more) is only 85-88%
accurate in predicting that she IS PREGNANT. This is because
a doe may be cycling in an abnormal manner or she may have been pregnant
when tested, but later reabsorbed or aborted. We
also provide endocrine (hormone) testing for many other species, including
Mountain Instrumental Laboratories, Inc.
Collins, CO 80525