Female pigs' reproductive systems recognize whether a sperm will produce a boy or a girl before it reaches and fertilizes the egg, and their oviducts fallopian tubes change in response. Scientists think this may be a way females unconsciously influence the sex of their offspring. The findings, reported in the open access journal BMC Genomics , show that different genes are active in female pigs' reproductive system cells in experimental conditions when all X female or all Y male sperm are present. Although in nature, the ratio would normally be , this suggests females might be able to change the environment of the oviduct to favor one sex over the other, giving that sperm a better chance of winning the race to the egg. Studies of humans and animals have shown that the sex ratio of offspring can be affected by factors such as the age of the mother, or environmental factors like famines and wars.
Huge pig tries to have sex with woman in front seat of car
The patterns of adult copulatory behaviour can be observed in piglets. This sex play is more frequent in young boars than in young sows and reaches a peak during the second neonatal month. The castration of young boars within 5 min after birth 7 animals eliminated the intense sex play of the second month.
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