Age determination of cattle based on the number of fully-developed incisors of the lower jaw
1998
Hende, J. van | Hoof, J. van (Gent Univ., Merelbeke (Belgium). Faculteit Diergeneeskunde)
In 1997 the exact ages of 1520 cattle slaughtered in the experimental slaughterhouse at the University of Ghent were noted, along with the number of fully-developed incisors in the lower jaw of each animal. Only the fully-developed incisors were counted; signs of wear were not taken into consideration. The mean and standard deviations of the ages of the animals for the five pairs of fully-developed incisors in the lower jaw were calculated. A cubic regression line representing the age as a function of the number of pairs of fully-developed incisors in the lower jaw was established on the basis of the data. This regression line is useful only to a limited extent for determining the age of beef carcasses in accordance with the following formula: Age (days) = 541.9 + (416.1*P) - (1 10.1*squareP) + (17.4*cubicp) where p = number of fully developed incisors in the lower jaw.
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