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.
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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