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

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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
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
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

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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.
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.
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.
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.
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.
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.
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.
The water bag is a yellowish-coloured sac that hangs down from the vulva, and is always the first to appear before the calf.
If the feet are pointing down, then the calf is in normal position. Soon the nose will also start to show.
The calf is born! Congratulations!
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.

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Question
Can I still milk a cow while it's pregnant?
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.
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My first calf heifer (ready to calf) has been discharging clear fluid for about a day, but no contractions. Is this normal?
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.
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Will a cow call her calf repeatedly for half a day before giving birth to it?
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.
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Tips

Always keep an eye out when cows and heifers are calving. Watch for any signs of dystocia, as the sooner you act the higher the chances are of saving the calf and the cow.
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The birthing process itself only takes from a half hour to an hour if it's a normal presentation. If it's not a normal presentation (dystocia), the female will need assistance ASAP.
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The placenta may normally take from 6 to 12 hours to be expelled.
- Cows may have a retained placenta that may take 24 to 48 hours to expel; some even up to 10 days. Retained placentas are nothing to panic about, especially if the female is not showing any signs of illness or infection, because the cow will eventually expel it herself.
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Warnings

Never assume all cows and/or heifers are going to be calving out just fine by themselves.
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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.
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