I do not believe there is any consistency problem with being "pro-choice" (not the best term) and for animal rights. Actually, I'd say it is more inconsistent to be anti-abortion and for animal rights.
When a woman talks about HER
right, or HER
wants, or HER
body she is completely justified. The fetus is subject to her body, wants, and rights. This is a special case that is not comparable to the animal rights issue. (In fact, it maybe the only time where one form of animal life is always justifiably subject to another.)
The conflict between humans and non-humans is a social construct. Talking about someone's right to "choose" to eat other animals is not the same as a woman's right to "choose" to have an abortion. There is no reason for nonhumans to be subject to humans. Like I said in another thread, we are not their "stewards," "parents," "owners," "rulers," or "protectors." The exploitation of another animal for food is a violation of that animal's rights as a sentient being. We can speak of equality between humans and bees, because bees do not require anything from us.
A fetus cannot be anything but subject to the woman whose body it resides within. Any conflict between the woman and the fetus is up to the woman to settle. The woman's sentience supersedes that of the fetus, even during late term pregnancy. This is the only way it can be done without unjustly interfering in a woman's right to her own body. This makes it impossible to speak of equality between a fetus and the woman who is pregnant with said fetus.
We say that nonhuman animals should be left alone and that humans should not exploit them. The same respect should be paid to pregnant women. They are the only ones in a suitable situation to decide whether to allow a pregnancy to come to term or not. Any outside interference will end up exploiting those who are pregnant as a means to some arbitrary moral or political end. If we can tell a woman she has to go to term, what is to stop us from telling her what to eat, how to lay while she sleeps, what music she can listen to while pregnant, or interfere in the millions of other activities that may have an affect on fetal development?
Gary Francione has written a lot on this topic. You might want to check out the following:
Animal Rights Commentaries: Abortion and Animal Rights