How to Tell if a Cow or Heifer Is About to Give Birth

Knowing the signs of a calving cow or heifer is important in determining whether that female needs assistance or not, and what the physical and physiological signs are of a cow giving birth. How the calf is normally born is also described below.

Note: Birthing is also called Parturition.

Method 1
Method 1 of 2:

Endocrine and Physiological Steps of Parturition

  1. Image titled Tell if a Cow or Heifer Is About to Give Birth Step 1
    1
    Stage 1: Initiation of myometrial contractions (removal of progesterone block).
    1. The fetus becomes stressed because it approaches the inherent space limitations of the uterus, resulting in the fetus's anterior pituitary gland to release ACTH (Adrenal corticotropic hormone).
    2. Fetal cortisol promotes the synthesis of three enzymes (17alpha Hydroxylase, 17-20 Desmolase, and Aromatase) to convert progesterone to estradiol.
      • Estradiol encourages myometrial (or uterine) contractions become more active and contractions are more noticeable.
      • Secretory activity also increases in the vagina and cervix, with the production of mucus providing lubrication for the easier passage of the fetus.
        • Mucus secretion also helps wash out the cervical seal of pregnancy.
    3. Fetal corticoids also cause the placenta to synthesize PGF2alpha to help eliminate the progesterone block.
      • Corpus luteum starts to regress, facilitating the decline in progesterone.
      • Relaxin, a glycoprotein, is produced by PGF2alpha and stimulates the softening of the connective tissue in the cervix and promotes elasticity of the pelvic ligaments, allowing easier passage of the fetus.
    4. Calf fetus rotates so that the front feet and head are positioned towards the rear (posterior) of the dam.
    5. Contracting uterus begins to push the fetus towards the cervix, applying pressure to the cervix.
    6. Pressure on the cervix activates pressure-sensitive neurons located in the cervix that synapse in the spinal cord and eventually synapse with oxytocin producing neurons in the hypothalamus.
    7. Oxytocin acts to facilitate myometrial contractility initiated by estradiol and PGF2alpha.
    8. As pressure on the cervix increases, oxytocin secretion increases; force of contraction of the myometrial smooth muscle begins to peak.
    9. Fetus enters cervical canal; first stage complete.
  2. Image titled Tell if a Cow or Heifer Is About to Give Birth Step 2
    2
    Stage 2: Expulsion of the fetus.
    1. Strong myometrial and abdominal contractions continue until the calf is expelled from the birth canal.
    2. The feet and head of the fetus put pressure on the fetal membranes until they rupture, resulting in a substantial loss of amniotic and allantoic fluid.
    3. Fetus becomes hypoxic (or deprived of adequate oxygen levels), and this hypoxia promotes fetal movement which in turn promotes further uterine contractions.
  3. Image titled Tell if a Cow or Heifer Is About to Give Birth Step 3
    3
    Stage 3: Expulsion of fetal membranes.
    1. The car-uncles (or chronic villi) becomes dislodged from the uterine wall
      • This release is believed to be brought about by powerful vasoconstriction of arteries in the villi.
    2. Further myometrial contractions, as well as the beginning of the involution of the uterus, help expel the fetal membranes.
Method 2
Method 2 of 2:

Physical Signs of Parturition

  1. Image titled Tell if a Cow or Heifer Is About to Give Birth Step 4
    1
    Freshening. The first signs of parturition in cows and heifers is that most will start to freshen (or bag up or start lactating) before birth. This may range from 24 hours before birth to even 2 to 3 weeks before birth.
    • The teats of the cow will start to fill up, looking full and distended, with the teat plugs often starting to come out. Most cows will show these signs 24 hours prior to calving.
  2. Image titled Tell if a Cow or Heifer Is About to Give Birth Step 5
    2
    Loose and swollen vulva. The vulva of the cow or heifer gets quite swollen and large. It also tends to look very loose, with more creases forming along the sides and underneath the vulva than normally.
  3. Image titled Tell if a Cow or Heifer Is About to Give Birth Step 6
    3
    Sinking of the tailhead. The pelvic bones begin to widen out (as a result of the hormone relaxin, as described above), and the tailhead sinks lower into the hooks of the pelvis.
  4. Image titled Tell if a Cow or Heifer Is About to Give Birth Step 7
    4
    Noticeable straining and discomfort. The first signs of labour occur when the cow usually stops to strain, or may kick at her belly because of the discomfort the contractions are causing her. She will also be laying down and getting up a lot, and be quite fidgety.
  5. Image titled Tell if a Cow or Heifer Is About to Give Birth Step 8
    5
    Aloofness. A cow or heifer will usually find a secluded place away from the herd to give birth, whether it's in a grove of trees or in a corner of a corral or pasture.
  6. Image titled Tell if a Cow or Heifer Is About to Give Birth Step 9
    6
    Clear discharge from the vulva. After noticing the signs in steps 1 to 3 above, you will also notice a clear mucus discharge from her vulva. This is the onset of the secretions starting in the cervix and vagina to help with reducing friction and aid in an easier birthing process.
  7. Image titled Tell if a Cow or Heifer Is About to Give Birth Step 10
    7
    Sides sink in. The sides of the cow begin to sink in, and her belly appears to be more larger in the back than it was in the front.
  8. Image titled Tell if a Cow or Heifer Is About to Give Birth Step 11
    8
    Expulsion of the water bag. The water bag is a yellowish-coloured sac that hangs down from the vulva, and is always the first to appear before the calf.
  9. Image titled Tell if a Cow or Heifer Is About to Give Birth Step 12
    9
    Feet and head appear from the vulva. If the feet are pointing down, then the calf is in normal position. Soon the nose will also start to show.
  10. Image titled Tell if a Cow or Heifer Is About to Give Birth Step 13
    10
    Shoulders appear, then the barrel and finally the hips and back legs. The calf is born! Congratulations!
  11. Image titled Tell if a Cow or Heifer Is About to Give Birth Step 14
    11
    Reddish "gunk" and a sac appear within a matter of minutes to an hour after the calf is born. This "gunk" may stay on the rear of the cow for 6 to 12 hours, until her uterine contractions completely expel it.
    • This "gunk" is the afterbirth, the remains of the placenta and fetal membranes.

Community Q&A

  • Question
    Can I still milk a cow while it's pregnant?
    Karin
    Karin
    Top Answerer
    Yes, but only if that cow continues to produce milk. The fact that she is pregnant or not actually has nothing to do with her ability to produce milk. A cow can be lactating (producing milk) when she is not pregnant as well as after she has been successfully bred. Cows can and often do produce milk (and suckle a calf) right up until she calves again.
  • Question
    My first calf heifer (ready to calf) has been discharging clear fluid for about a day, but no contractions. Is this normal?
    Karin
    Karin
    Top Answerer
    Yes. The clear mucous will be showing from a few days to several weeks before calving. Keep a close watch on her vulva and tail-head. If that vulva starts getting more loose and the tail-head sinks down a little, that's a sign she's getting very close. And, to make matters worse, it's a heifer, so know that heifers are notorious for not calving when expected like with more mature and experienced cows.
  • Question
    Will a cow call her calf repeatedly for half a day before giving birth to it?
    Karin
    Karin
    Top Answerer
    It's unusual, but possible. Although this may not be the cow "calling" to her calf so much as groaning with ever stronger contractions that can cause any female in labor to be a little vocal.

Warnings

  • Never assume all cows and/or heifers are going to be calving out just fine by themselves.
    ⧼thumbs_response⧽
  • Be ware of cranky cows. Hormone levels are raging at this time, and a cow that is calving could be one that may be dangerous towards you. Be calm but assertive and firm when handling new mothers and calving cows.
    • A good stout stick or PVC pipe that will not break is a good weapon to have on hand to protect yourself against ornery mothers.
    ⧼thumbs_response⧽

You Might Also Like

Help a Cow Give Birth
How to
Help a Cow Give Birth
Raise Black Angus Cattle
How to
Raise Black Angus Cattle
Start a Cattle Farm
How to
Start a Cattle Farm
Start up a Beef Cow Calf Operation
How to
Start up a Beef Cow Calf Operation
Tell if a Cow or Heifer Is Pregnant
How to
Tell if a Cow or Heifer Is Pregnant
Tell the Sex of a Newborn Calf
How to
Tell the Sex of a Newborn Calf
Know when a Heifer or Cow Is Ready to Be Bred
How to
Know when a Heifer or Cow Is Ready to Be Bred
Tell if a Cow or Heifer Has Been Bred
How to
Tell if a Cow or Heifer Has Been Bred
Get a Cow With Nerve Damage to Her Hind Legs from a Long Birth or Hard Pull to Stand Up
How to
Get a Cow With Nerve Damage to Her Hind Legs from a Long Birth or Hard Pull to Stand Up
Breed Cows and Heifers Naturally
How to
Breed Cows and Heifers Naturally
Artificially Inseminate Cows and Heifers
How to
Artificially Inseminate Cows and Heifers
Read, Understand, and Use Expected Progeny Differences (EPDs) in Cattle
How to
Read, Understand, and Use Expected Progeny Differences (EPDs) in Cattle
Perform Rectal Palpation in Cows and Heifers
How to
Perform Rectal Palpation in Cows and Heifers
Breed Beef Cattle
How to
Breed Beef Cattle

References

  1. Senger, P.L. Pathways to Pregnancy and Parturition. 2nd Ed. Chapter 14: Placentation, the Endocrinology of Gestation and Parturition. Pullman, WA: Current Conceptions Inc. 2003. pp. 316-323.
  2. Thomas, H.S. Essential Guide to Calving. Chapter 3: Normal Calving and Difficult Deliveries. USA: Storey Publishing. 2008. pp. 60-91.

About This Article

KL
Co-authored by:
Karin Lindquist
Animal Scientist
This article was co-authored by Karin Lindquist, a trusted member of wikiHow's volunteer community. Karin Lindquist earned a BSc in Agriculture as an Animal Science major from the University of Alberta, Canada. She has over 20 years of experience working with cattle and crops. She's worked for a mixed-practice veterinarian, as a sales representative in a farm supply store, and as a research assistant doing rangeland, soil, and crop research. She currently works as a forage and beef agriculture extension specialist, advising farmers on a variety of issues relating to their cattle and the forages they grow and harvest. This article has been viewed 346,641 times.
403 votes - 91%
Co-authors: 16
Updated: January 8, 2023
Views: 346,641
Categories: Featured Articles | Cattle Reproduction

Medical Disclaimer

The content of this article is not intended to be a substitute for professional medical advice, examination, diagnosis, or treatment. You should always contact your doctor or other qualified healthcare professional before starting, changing, or stopping any kind of health treatment.