The objective of the present study was to evaluate the effects of hemoglobin and carbonic anhydrase phenotype on heat tolerance traits in a herd of Pitanguelras dairy cattle. Electrophoresis showed the occurrence of four hemoglobin phenotypes, l.e., A, AB, B and AC. The alelle frequencies for this system were 91.85*, 7.89* and 0.26* for alleles HbA. HbB and Hbc,
 respectively. The phenotypes observed for the carbonic anhydrase system were S, FS, F, SZ and FZ, with allele frequencies of 81.83*, 12.84* and 5.33* for CA3, CA" and CA*, respectively. The chi-square test showed that this herd Is In Castle-Hardy-Welnberg equilibrium for the hemoglobin and carbonic anhydrase systems. The different phenotypes had no significant effect on heat tolerance.

Raysildo B Lôbo, de Matos A. Lemos, N. Mortari, F. AM Duarte

Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume XIV. Dairy cattle genetics and breeding, adaptation and conservation., , 414–417, 1990
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