Hi Martin,
No, it is not against Church teaching because while animals mate for procreation, they don't become one flesh, as a man and woman do.
There is no unitive act of self-giving love between animals. They don't have immortal souls, nor the cognitive ability to understand such a relationship.
The reason artificial insemination is a sin, is the same reason that artificial birth control is sin. Both:
- artificially separate the self-giving act or unitive act from the procreative act.
John
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