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So I found out about google books. It is a wonderful site. I though I’d give it a whirl as I have been looking for information about what can affect sex is determination of the progeny of my swine. The reason being we seem to be having a lot of boar piglets. So we have an older boar, that is older than the sows, that bred the sows during the harshest most stressful part of the year. According to this, perhaps that explains why there were so many more boars.
However, in cattle it has been suggested:
I would love to see if if at all mineral needs, overall diet, stress, age, affect and can be controlled to increase the likelyhood of various offspring. I did find one study showing that social hierarchy can affect the ratios of males to females.