The effects of American Brown Bulls on the various productive characteristics in the Brown cattle of different genotypes
I. Birth Weight, Live Weight, Body Measurements and Livability

American Brown 24, American Brown x Karacabey Brown 23, American Brown x Swiss Brown 9, American Brown x Austrian Brown 5, American Brown x German Brown 9, Karacabey Brown 14.

All the animals were weighed at birth, 1 st, 2 nd, 3 rd, 4 th, 6th and 12 th months of age. At the same time four body measurements (height at withers, chest girth, body length, circumference of cannon bone) were recorded. In order to determine the livability of animals, health records were also taken. The same management and feeding practiced to all animals during the experimental period.

No significant difference were found among groups on the birth weight, live-weight and body measurements. However, at the beginning of the 2 th months of experiment, a superiority was observed on the live-weight and body measurements for the daughters of American Brown bulls. The number of death losses occurred during the pre weaning period were two in American Browns and one American x Karacabey Browns.

It may be concluded that under the Karacabey State Farm conditions the daughters of American Brown bulls were superior to American and Karacabey Browns in live weight gains and body size. Keywords :