Most farmers are happy to answer questions asked.
We remove calves at about 24 hours. Rightly or wrongly most maternal instincts have been bred out from Holsteins. The mothers rarely bellow or show distress, they are more interested in food.
Our calves are kept in a calf house, in individual pens, in full sight of each other. This allows us to monitor each calf's feeding, we know exactly what each calf is drinking and eating, spot illness sooner and treat it and as recent global events prove, isolation stops illness spreading. Once weaned they are placed into larger groups which they stay in. In an ideal world I would have this lely.com/gb/solutions/feeding/calm/ but we are a smaller scale farm and often only have 5 calves on milk so can't justify the cost.
Usually after 3 months but this varies, some cows need extra time. UK average calving interval stands at 410 days ( days between calvings).
I can only provide information on what we do on our farm. We have very few bull calves born due to sexed semen. Our cows are high yielders which mean that we can keep less cows whilst still producing the same amount of milk. Less cows allows us to spend more time with each cow and reduces the impact on the environment.
@SadSisters
Thank for providing those 2 links, I'm sure that you have read them carefully, I'll be quoting from them in future.
The Morrisons article seems to support what I was saying, things are changing.
I agree that the second link is from 2020, it is based on a report carried out by CHAWG (Cattle Health and Welfare Group) that was first published in March 2018. Again it appears to back me up. "Bull calves euthanised on farm reduced 84817 in 2006 to 64883 in 2013 a reduction of 23%". "Number of farmers using sexed semen in 2016 increased from 60% to 67% in 2017". "Percentage of bull calves retained at birth rose from 60% in 2006 to 81% in 2015". This report contains no information regarding bull calf cull rates since 2015.
As I said, things are improving and thank for helping to support that claim.