The age of eruption of the permanent incisors of female Malawi Zebu

The incisors of 64 Malawi Zebu females with known birth dates from the Bunda college farm herd were checked monthly over a period of 22 months when the cattle were weighed. When a pair of permanent incisors had erupted in the interval since the previous weighing the age of eruption was taken as mid-way between the two weighings. Eruption of a pair was not considered to have occured unless both teeth of the pair were plainly visible. A total of 98 observations of eruption were obtained.