A child born to a married woman is presumed under common law to be the child of her husband by a presumption of paternity or presumption of legitimacy.
The behaviour of cows and heifers after they have conceived is one of the best non-invasive means of determining pregnancy in cattle. Simply put, pregnant cattle will not (or should not) come into estrus or heat for the entire duration of the 9.34-month (285 day) gestation period.
A new method for synchronizing estrus in mature beef cows (not for heifers) is to administer a GnRH injection followed one week later by an injection of prostaglandin (see Figure 7). Females are observed for signs of estrus beginning 36 hours before and up to 6 days following the prostaglandin injection.