Cystic ovarian disease is very common in sows over the age of 1.5 years, an incidence of 76% has been reported at post mortem (Keller et al, 1987). Puberty occurs at around 2 months of age in females...
The 19th and 20th century psychologists argued long and hard over the relative influences of nature and nurture on an individual's behaviour. The current consensus is that both the genetic background...