Could the delay in milk extraction (milk letdown related problem) related to the initial stress (mishandling; a lot of noise/shouting) the cows are undergoing? Are all cows experiencing the same problem or some NOT all? Are you handling the cows gently before milking them? At which stage are the cows? Mid lactation or late lactation? In some farms, some gentle music is played in the background to make the cows feel good and comfortable!! If you answer these questions, you might probably get the cause of your problem!

Dear Elly,

Thanks very much.

I agree with you. I am in fact gathering this information.

I think that the problem comes from lack of familiarity with milking machine (they are all heifers) and udder pain (they were recently suffering from bloody milk).

Regards,

Alfredo. 

There are many reasons can be caused to blood in milk. Most cases it is obvious that blood in milk after parturition in heifers. The pressure of bagging up can break capillaries and damage of alveoli can be the cause. Here in New Zealand, they mostly practice the paddock system and they do not let the heifers run in the paddock right after the parturition because it will damage the udder tissues and results bloody milk and even blood will presence in colostrum. If it will long lasting, the ultimate result might be mastitis in most of the times. I don’t exactly know what your management system is. But here, I mention a one of the possible causes for bloody milk which I witnessed.

Greetings. Perhaps you should also check the milking machine, vacuum and rhythm buttons.

Yes Francisco, I am on it. I think that this has various causes.