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ESTRUS DETECTOR

 

Estrus Detector Draminiski

One of the most important elements in the organization of animal reproduction is the proper detection of estrous. This is due to the close correlation between efficient insemination and the time it is done.Research has shown that farm personnel detect heat in about 50% of animals. Much attention is therefore paid to careful observation of animals, not only during working hours but 24h a day if possible. This however, creates certain difficulties of a practical nature, negatively influencing estrous detection.It should be emphasized that a very important aspect of organizing reproduction is also the ability to detect early pregnancy or the following estrous after unsuccessful insemination.

Knowledge of the physiology of estrous and in particular cyclic changes taking place in the reproductive organs, allowed the discovery that together with changes in the ovary, changes in the electrical resistance of vaginal mucus occur. An interdependence was also noticed between changes in vaginal mucus resistance and changes in blood levels of luteinizing hormone (LH) and milk progesterone levels.

Studies on the properties of vaginal mucus have established that the closer to estrous the less electrical resistance of vaginal mucus.The above phenomena and interdependence of mucus resistance in the vagina of animals have been taken advantage of by DRAMINSKI in the construction of our DRAMINSKI ESTROUS DETECTOR.This instrument enables quick and easy determination of the onset of estrous and early confirmation of pregnancy.The DRAMINSKI Estrous Detector consists of a measurement probe,electronic unit and handle containing a standard 9 volt battery. The electronic unit is equipped with an LCD panel for reading measurements.

At the end of the probe there are two metal electrodes parallel to each other which serve to measure resistance. The magnitude of current flowing between the two electrodes and the electrical field created is absolutely harmless to animals and humans. The entire device is waterproof, which enables washing and easy maintenance of hygiene.

DRAMINSKI Estrous Detector :

  • enables quick and optimal covering of animals that come into heat atypically.
  • enables detection of silent estrous*enables detection of heat in animals with irregular heat
  • enhances insemination efficiency markedly,
  • has a positive influence on farm-hand discipline,
  • improves the economic performance of your farm.
  • Additionally it enables early detection of gestation or the next estrous if no fertilization occurs

 

Operation :

While testing the apparatus in the open air i.e. with open electrodes check the following:

1. Press the ON/OFF switch. After pressing the button two dashes are displayed indicating the device readiness to work.

2. Press the switch three times - the digits 1, 2, 3 will be displayed (a-c).

3. Press the switch last time to see the digits "1 0" indicating that the battery is connected and the instrument is operating, but no measurement is being taken. a)1, b)2, c)3, d)1 0

An additional function of the LCD display is to indicate battery failure. When LO BAT blinks on the display you will soon need a fresh battery.The battery is dead when the signal is constant. The lowest scale is 10 units, while the range of measurement is from 0 to 1990 units. When this scale is exceeded the digits "1 0" appear on the LCD display, signaling overflow (as in the case of the electrodes being tested while in contact with the atmosphere). The range of measurements of the detector is several times that of the vaginal mucus electrical resistance to be tested, and in practice this scale is never exceeded.

Familiarization :

Before commencing measurements it is recommended that as a first time user:

1. Do some measurements on some animals which are evidently in heat.

2. Do some measurements on some animals not in heat or pregnant.

The functioning of the instrument can be checked in the following way: Immerse the probe in a vessel of clean water and take a reading. It should be "1 0" indicating that the measurement scale has been exceeded as resistance of clean water is great. In practice

We will never exceed the scale because max. vaginal mucus resistance is many times less than the max. scale. Next, put a little pinch of salt into the water, mix well, then immerse the probe again. After addition of salt the result is clearly lower than before. Salt lowers the resistance of the solution (less resistance-lower result). Addition of some more salt lowers the result even further. This experiment shows well how the instrument works. It also serves to demonstrate how the presence of urine (which contains salt) on the electrodes causes an abnormal lowering of results.

Taking a Reading

1. Check the electronic functioning of the DRAMINSKI ESTROUS DETECTOR in contact with the atmosphere, making sure there is no need to change the battery.

2. Prepare a disinfectant fluid and disinfect the probe in accordance with the steps given in the chapter on disinfection.

3. If vaginal labia or the surroundings are dirty, wash and clean before inserting the probe.

4. Spread apart the vulva and delicately insert the probe so that its end reaches the lower depression which ought to be reached at a length of 3/4 of the probe. When this depth is reached some resistance is felt. Then, carefully make 2-3 half-turns of the probe.

    Rectal examination can help to determine if the probe is at a correct depth.

5. Press the ON/OFF switch. After pressing the button two dashes are displayed indicating the device readiness to work. (- -)

6. Press the switch once again - the digit "0 1" will be displayed. It means that the first reading was memorized (a).

7. Next, press the switch two more times to memorized readings a) 1, b) 2, c) 3,

8. Press the switch last time to see the lowest result (d) d) 540

9. Remove the probe gently.

10. Disinfect the probes using a disinfectant and keep in storage box.

Interpretation of Result :

1. Detecting Estrus : Value 180-200

It can be seen here that detection depends on registering the period when resistance is at a minimum and the following sharp rise.

2. Detecting Ovulation : Value 280-300

The rise in resistance indicates ovulation within a few hours or so and is the best period for INSEMINATION or MATING. A fall in resistance does not automatically signal the onset of estrus. Further measurements are necessary to determine the minimum value and the following sharp rise in resistance which indicates estrus. Heat does not last long thus, during this period, measurements should be taken more than once daily.

NOTE! Values shown in the pictures are TYPICAL, the result of many months of our research and are compatible with results obtained in other countries. However, lower values during heat are sometimes met, as are higher values out of estrus. Therefore, each animal ought to be treated individually. However, in practice results sometimes may differ regarding resistance during the various phases of the cycle in animals.

Detecting Early Pregnancy : Value above 300

This is done approx. 3-4 weeks after insemination or mating. It is best to begin measurements when the next heat is expected if insemination was unsuccessful. If resistance remains high for a few days, it will mean gestation is in progress.

On the other hand, less resistance will indicate the animal is not pregnant and heat is approaching

Interpretation of Result:

 

1. Detecting Estrus : Value 180-200

It can be seen here that detection depends on registering the period when resistance is at a minimum and the following sharp rise.

 2. Detecting Ovulation : Value 280-300

The rise in resistance indicates ovulation within a few hours or so and is the best period for INSEMINATION or MATING. A fall in resistance does not automatically signal the onset of estrus. Further measurements are necessary to determine the minimum value and the following sharp rise in resistance which indicates estrus. Heat does not last long thus, during this period, measurements should be taken more than once daily.

NOTE! Values shown in the pictures are TYPICAL, the result of many months of our research and are compatible with results obtained in other countries. However, lower values during heat are sometimes met, as are higher values out of estrus. Therefore, each animal ought to be treated individually. However, in practice results sometimes may differ regarding resistance during the various phases of the cycle in animals.

3. Detecting Early Pregnancy : Value above 300

This is done approx. 3-4 weeks after insemination or mating. It is best to begin measurements when the next heat is expected if insemination was unsuccessful. If resistance remains high for a few days, it will mean gestation is in progress. On the other hand, less resistance will indicate the animal is not pregnant and heat is approaching

Closing Remarks :

1. Store the ESTROUS DETECTOR in a dry place at room temperature.

2. For large scale farming it is better to use one instrument for one shed.

3. Normal veterinary hygiene is easy to maintain by ensuring that your DETECTOR is clean and disinfected after each use.

4. Twil Canada kindly asks all users to send in any comments or observations concerning exploitation and results obtained while using the ESTROUS DETECTOR.

Frequently Asked Questions

How can I check if my detector operates properly?

  • Turn on the instrument in the open air, "0 1" should be displayed on the screen
  • Prepare solutions of kitchen salt at different concentrations. Immerse the detector probe in each solution and check if it reacts correctly (the higher the concentration the lower the readings should be)
  • While inspecting the instrument always ensure that the probe electrodes are clean and there is no "LO BAT" displayed on the screen which indicates low battery levels.

Does the way of using the instrument affect the readings?
Yes, it does. The angle at which the probe is introduced into the vagina as well as the probe length influence the readings. For that reason we recommend to perform measurements always in the same or similar manner.

Is it possible to determine early pregnancy with the Detector?

Yes, it is possible in the determined period after insemination (in cows it is after 3-4 weeks). If the Detector’s readings still remain high (in cows it is about 300 units or more), it means that the animal is pregnant. Obviously the interpretation is valid for completely healthy animals.

Decreasing readings (in cows about 200 units or less) after insemination indicate that the animals are not pregnant and that subsequent heat is approaching.

Which animals can the Estrus Detector be used for?

DRAMINSKI Company manufacture the following versions of the instrument: *for cows and mares *for pigs *for ewes *for bitches. These detectors differ mainly with the probe size and location. The user should remember that the test principle is the same in all versions; however, measurements and interpretations are different for each species.

Which agents should be used to disinfect the detector?

You can use all disinfecting agents recommended for veterinary use. You must be careful while using these agents when the test is performed shortly before insemination (as the agent may kill sperm cells). In such a case the probe should be rinsed with water after disinfection.

What are the main guidelines about the use of the Estrus Detector?

The tests should be performed as often as the manual says, especially, when you are not experienced enough. In the initial period perform tests once a day and later, when the resistance readings increase, twice a day.

Ensure the probe is introduced into the vagina in the same manner and into the same place every time. If this rule is not met, the readings might be false. Perform measurements at the same time of a day, in the morning at best.

There are many factors which may influence the readings. When the tests are always performed at the same time, these factors are eliminated.

Always remember to disinfect the Detector (especially the probe) before and after use.