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The only anatomical changes that occur to the cow is the growth of her belly and her udder filling up with milk.
With the calf though, it's much more complex than this. During pregnancy, after the ovum is fertilized by the bull's sperm, the now-zygote divides and divides until it becomes an embryo. The embryo, after being ejected from the blastocyst that was formed around it and expelled it into the cow's uterus, attaches itself to the uterine wall and starts forming the placenta. The embryo is still undergoing cell mitosis so that different tissues start differentiating into the various organs that are soon to form into the body parts of a fetal calf. The heart and primitive nervous system forms during the first trimester, and sexual differentiation also starts to form according to the pre-determined chromosomes as determined by the sire. Also, limbs and the head start to form from buds, which start to form into legs, a tail and a head. By this time the embryo becomes a fetus. In the second trimester, all the organs, except the respiratory system, begin to form and mature in the fetus's body. Facial features also become better formed during this time, and the hooves, legs and tail also are finished forming by the time the second trimester is more than half-way through. By the time the third trimester arrives, the fetus now has completed forming the body, face, legs, hooves and tail, but no hair is present. The fetus is the size of a cat by now. During the third trimester, the calf grows in size and the lungs begin to form, complete formation by the time the calf is almost ready to be born. Also, hair forms and teeth begin to bud. Then, the calf is too big to fit in the uterus anymore and is expelled via uterine contractions of the cow.
What else can I help you with?
Where does everything take place in the cow during pregnancy?
In the uterus.
How many uterus does a cow have?
A cow has only one uterus, just like all other mammals
What does it mean if you dream a cow swallowing a pregnant woman?
If you are pregnant, this is a good example of the sort of weird dreams that are common during pregnancy, because of shifting hormones effecting your dreams. It simply expresses your feeling "as big as a cow." In other words, the cow symbolizes the pregnancy that has "consumed" your entire life.
Will a cow lick another cow in her later pregnancy?
Yes, if she's friends with that other cow.
If a cow develops increased fur during cold weather is that genetics or environment?
Environment and adaptation to the changes of the environment.
What is the third trimester of a cows pregnancy?
The third trimester of a cow would be days 195 to 285 of a cow's gestation period. This is a critical period of a cow's pregnancy because the calf is growing more in size than it has in the last two trimesters.
What is the hormone of pregnancy in a cow?
Progesterone, just like in women.
How you diagnose the pregnancy in cow and buffalo?
You perform a rectal palpation to feel the uterus - if the cow or buffalo is pregnant, you may feel the fetal membranes or the fetus depending on how far along the pregnancy is.
Will a bull ride a cow that has already been breed?
No, not usually. On rare occasions, a cow may experience false heats during pregnancy where she can be ridden by a bull, but otherwise, a cow that is pregnant stays pregnant and doesn't go into heat until a couple weeks after she's given birth.
Full term pregnancy for cow?
A cow will carry a calf to full term which is 285 days or around 9 months.
What method is most commonly used to diagnose pregnancy in the cow?
Rectal palpation.
When does a cow's udder start to form?
A cow is a mature bovine that has had at least a couple calves, so her udder has already formed. A heifer, on the other hand, will only begin to form an udder when she is in the last trimester of pregnancy.
