Abstract
This study aimed to investigate the effect of beta-casein genotypes (A1A2 and A2A2) in three different thermal comfort conditions on the adaptability of Sindhi cows and as a tool for selecting thermotolerant cattle. Twelve Sindhi cows were used in a completely randomized design in a 2 × 3 factorial arrangement, with six replicates, with two genotypes, and three thermal comfort conditions. The climatic variables were recorded, while black globe temperature, humidity index, and radiant heat load were calculated. We measured respiratory rate, surface temperature, and rectal temperature while the heat tolerance coefficient was calculated. Genotype had no significant effect (p > 0.05) on any of the parameters measured. However, there was a thermal comfort condition effect (p < 0.05) on rectal temperature, surface temperature, and thermal gradients. The respiratory rate and heat tolerance coefficient were not significantly affected (p > 0.05). Therefore, although the results indicate substantial adaptability of Sindhi cows under any thermal conditions, the tested genotypes should not be used as a tool for selecting thermotolerant Sindhi cows.
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Funding
This research was funded by the National Council for Scientific and Technological Development (CNPq-Brazil) and Coordination for the Improvement of Higher Education Personnel (CAPES).
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Rhamon Costa e Silva: data curation, formal analyses, investigation, writing—original draft; José Fabio Paulino de Moura: conceptualization, supervision, funding acquisition, methodology; Bonifácio Benicio de Souza: Supervision, investigation, methodology; José Morais Pereira Filho: data curation, formal analyses, investigation; Leilson Rocha Bezerra: data curation, formal analyses, investigation; Fábio Santos do Nascimento: data curation, formal analyses, investigation; Juliana Paula Felipe de Oliveira: data curation, formal analyses, investigation, writing—original draft; José Nerivaldo de Araújo Wanderley: data curation, formal analyses, investigation.
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The utilization of the animals in the experiment was approved by the Animal Use Ethics Committee of the Federal University of Campina Grande (Protocol number 110/2018), in accordance with the guidelines of the National Council of Control of Animal Experimentation (Brasília, Brazil; CONCEA).
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Costa e Silva, R., de Moura, J.F.P., de Souza, B.B. et al. Polymorphism of the beta-casein gene and adaptability of Sindhi cows to semiarid conditions. Trop Anim Health Prod 53, 534 (2021). https://doi.org/10.1007/s11250-021-02948-0
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DOI: https://doi.org/10.1007/s11250-021-02948-0