SUMMARY AND CONCLUSIONS Data have been presented for reproduction and production perform- ance of reciprocal F, crossbred cows representing the Angus, Brahman, and Charolais breeds. Results of this research showed no significant differences between F, reciprocal cows for traits measured. Therefore, under the environmental conditions of this study and with the breeds utilized, the production potential of the F1 cross female was not signifi- cantly affected by dam breed. Under environmental conditions similar to this study, Brahman bulls can be mated to Angus cows or Angus bulls can be mated to Brahman cows without materially affecting the performance of the resulting F, females. The same principle exists in the production of the other breed combinations represented in this study. However, under conditions where the dam breed is not adapted, and growth of offspring (F1 female) is so severely retarded that its genetic potential for growth is not reached, its ultimate production could be affected. These conditions would warrant the selection of the dam breed that is most adapted to the environment to ensure that the potential of the F, female is reached. LITERATURE CITED 1. Harvey. W. R. 1975. Least squares analyses of data with unequal subclass numbers. USDA ARS. 11-4. 2. Joubert, D. M. 1954. The influence of winter nutrition depression on growth, reproduction and production of cattle. J. Agr. Sci. 44:5. 3. Joubert, D. M.. and John Hammond. 1958. A crossbreeding experiment with cattle with special reference to maternal effects on South Devon-Dexter crosses. J. Agri. Sci. 51:325. 4. Pahnish, O. F., J. S. Brinks. J. J. Urick, B. W. Knapp, and T. M. Riley. 1969. Results from crossing beef x beef and beef x dairy breeds: calf performance to weaning. J. Anim. Sci. 28:291. 5. Peacock, F. M.. and M. Koger. 1982. Heterosis for weight in F1 crosses of the Angus, Brahman and Charolais breeds as long yearlings (unpublished data). 6. Peacock, F. M., M. Koger, T. A. Olson, and J. R. Crockett. 1981. Additive genetic and heterosis effects in crosses among cattle breeds of British, Euro- pean and Zebu origin. J. Anim. Sci. 52:1007. 7. Sagebiel, J. A., G. F. Krouse, Bob Sibbit, L. Langford, A. J. Dyer, and John F. Lasley. 1973. Effect of heterosis and maternal influence on gestation length and birth weight in reciprocal crosses among Angus, Charolais and Hereford cattle. J. Anim. Sci. 37:1273. 8. Turner, J. W. 1969. Preweaning production differences among reciprocal crossbred beef cows. J. Anim. Sci. 29:857. 9. Walton, A., and J. Hammond. 1938. The maternal effect on growth and conformation in Shire horse-Shetland pony crosses. Proc. Roy. Soc. (Biol.) 125:311.