Yes.
Valbazin cannot be used on pregnant cows that are in their first 45 days of pregnancy, nor can it be used on breeding dairy females. If you have pregnant cows that are at least 45 days pregnant, yes, you can use it on your pregnant cows.
Cows used for breeding only, or cows that are already pregnant.
By cows !
No, because cows don't have "breasts." They have UDDERS.
Only if the cow that they're mounting is in heat.
Yes.
Cows never get pregnett the get pregnant. They are pregnant for 9 months
Yes, if they're not pregnant.
9 months.
Yes, if (and only if!!) the milk from these cows are not being used for human consumption.
With dairy cows.
Methane