We are not cows but just thought that this document worth looking at in
regard to how dairy farmers have concerns about stress and work towards
eliminating it.
Valerie W. McClain, IBCLC

http://www.dqacenter.org/dcare/dcare34.htm
Reducing stress to the cow, particularly at milking time, helps to maximize
milk yield. An effective preparation routine will help to overcome any
negative effects of stress experienced by the cow before or during milking.
When a dairy cow is frightened or excited or experiences pain, she releases
hormones into the bloodstream that interfere with her milk let-down and
resistance to mastitis and other diseases. Therefore, a consistent operating
routine for bringing cows and milking machines together is essential. Gates
and restraining equipment should operate smoothly, quietly, and safely.
Waiting time should be consistent with each milking and kept as short as
possible. The preparation routine that signals the beginning of milking
should be pleasant to the cow and consistent. The routine should include
checking for abnormal milk and thorough cleaning and drying of the teats.
Avoid medical examinations or unpleasant experiences from being associated
with the place of milking.

This reference appears on page 16 of the Caring for Dairy Animals Reference
Guide. This manual may be ordered from the Dairy Quality Assurance Center for
$7.00 (plus shipping.) Another manual, Caring for Dairy Animals On-Farm
Evaluation Guide, is available for $6.00.

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