Whenever and after she calves, which is usually at around 24 months of age.
It can be done: I've seen a heifer get another heifer that has not been bred and not produce a calf start milking all because another one was suckling her. But there are some concerns that come with such a practice:Introduction of mastitis by "forcing" her to lactate,Not as much milk may be produced as the cow would if she calved,You would have to keep up the activity of milking her everyday without getting any milk (which takes time and patience) until you DO get milk from her,It's harder work getting a dry cow to start milking again yourself than to simply breed her, wait nine and a half months til she calves then simply start collecting milk from her.Some food for thought.
If you are looking to get more dairy in your diet, you should start by drinking a lot of milk. Also, you should start eating a lot of yogurt as well as other products that contain dairy.
After it calves
Cow milking started long long time ago before slavery.
drop calves are baby cows that are taking from their mothers soon after birth. This is used in the DAIRY indistry to start the mom cow milking and after the baby is born the cow is used for production. The dairy with most times sell the boys and keep the girl for future stock
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After having their first calf.
The easiest place to milk a goat is on a milking stand. See the related link
When their utters are heavy you can start milking them. You should probably filter the milk before you drink it straight, but you can start cooking with the milk straight away
After it has had a calf, which is at around 2 years of age.
If you stop milking a cow, the udder will get really big, but will not explode. The milk will slowly diminish and the udder will get back to normal size after a while, and she will not be giving milk any more. Of course, to get her to start milking again, she will need to give birth to another calf. However, you can get her back milking again if you start milking before she completely dries up, but she will likely be producing less than initially.
This will depend on how much milk she is still producing once she comes home. If her udder is still looking full you may be able to start milking her again. Keep in mind that she might have mastitis, treat it as you normally, and begin milking her. It is probably a good idea to see if she does have mastitis either way, if she does treat it and dry her off if she is not able to milk. A month should not be too harmful to her, if she was producing milk before hand, however, anywhere longer than that you might not be able to begin the milking process.