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Biochemical blood polymorphisms in pitangueiras cattle and their effects on reprodutive, productive and heat tolerance traits

Alvaro de Matos Lemos^I; Raysildo Barbosa Lôbo^II; Norma Mortari^III; Francisco A. Moura Duarte^II

^IEMBRAPA-CNPGL, 36155 Coronel Pacheco, MG, Brasil. Send correspondence to A.M.L.
^IIDepartamento de Genética, Faculdade de Medicina de Ribeirão Preto, Universidade de São Paulo, 14049 Ribeirão Preto, SP, Brasil
^IIILaboratório de Imunogenética, Universidade Federal de São Carlos, 13560 São Carlos, SP, Brasil

ABSTRACT

The objective of the present study was to evaluate the effects of hemoglobin and carbonic anhydrase phenotype on reproductive, productive and heat tolerance traits in a herd of Pitangueiras daily cattle. Electrophoresis showed the occurrence of four hemoglobin phenotypes, i.e., A, AB, B and AC. The alclle frequencies for this system were 91.85%, 7.89% and 0.26% for alleles HB^A, HB^B and HB^C, 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 CA^S, CA^F and CA^Z, respectively. The chi-square test showed that this herd is in Castle-I Hardt-Weinberg equilibrium for the hemoglobin and carbonic anhydrase systems. The different phenotypes had no significant effect on reproduction, production or heat tolerance.

Keywords: Biochemical blood; Polymorphisms; Pitangueiras cattle.

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