Fertility traits of recipient cows raised in the Amazon biome

dc.contributor.authorAlves Diniz, Jefferson Viana
dc.contributor.authorPeixoto, Renato Mesquita
dc.contributor.authorSilva, Laine Oliveira
dc.contributor.authorBento Nogueira, Marina Marie
dc.contributor.authorFreitas, Rosano Ramos de
dc.contributor.authorLoureiro, Barbara
dc.contributor.authorSatrapa, Rafael Augusto
dc.contributor.authorOba, Eunice [UNESP]
dc.contributor.institutionUniv Fed Acre
dc.contributor.institutionEmpresa Brasileira de Pesquisa Agropecuária (EMBRAPA)
dc.contributor.institutionUniv Vila Velha UVV
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.date.accessioned2021-06-25T19:36:23Z
dc.date.available2021-06-25T19:36:23Z
dc.date.issued2020-10-01
dc.description.abstractThis study aimed to evaluate a correlation between environmental temperature-humidity index (THI), rectal temperature (RT) and plasmatic concentration of cortisol in pregnancy rates of recipient cows in the Amazon biome. Recipient cows (n = 235) were submitted to an estrus synchronization simplified P36 protocol for a Fixed-Time Embryo Transference (FTEF). Rectal temperature of recipient cows and ambient temperature, relative humidity (RH) and dry-bulb temperature ( degrees C) were recorded on day zero (DO), eight (D8) and 16 (D16) of the protocol. On D16, each recipient received an embryo after the confirmation of a corpus luteum. At this moment, a blood sample was collected and cortisol concentration was evaluated in the sample with radioimmunoassay. On D41 (D33 embryo), pregnancy diagnosis was assessed (PD). The yield rates of recipient cows and pregnancy after the protocol were 66.81% (151/226) and 35.76% (54/151), respectively. Cows that became pregnant presented lower means in RT, plasmatic cortisol and THI parameters (P < 0.05) in comparison to nonpregnant group. The percentage of pregnant cows at Day 41 was higher (P < 0.0001) for cows that had RT <= 39.1 degrees C in all the days analyzed (DO, D8 and D16). Likewise, cows that entered the chute area under a low THI ( < 74) had better (P < 0.005) pregnancy rates when compared with cows that were at the chute under a higher THI. This was observed on the three days evaluated throughout the protocol. The correlation coefficient between cortisol, RT and THI was above 59%. In addition, cortisol was lower in the PG cows. In conclusion, THI, RT and cortisol level are directly related to pregnancy success. Furthermore, this study could validate the use of THI as an auxiliary tool to assess thermal comfort and stress, which may reflect in the pregnancy outcome of recipient cows in the Amazon biome.en
dc.description.affiliationUniv Fed Acre, Grad Program Hlth & Sustainable Anim Prod Western, Acre, AC, Brazil
dc.description.affiliationEmbrapa Goats & Sheep Sobral, Anim Hlth Dept, Ceara, CE, Brazil
dc.description.affiliationUniv Vila Velha UVV, Lab Anim Reprod Physiol, Vila Velha, ES, Brazil
dc.description.affiliationSao Paulo State Univ, Vet Med & Zootech Coll, Botucatu Campus, BR-18618681 Botucatu, SP, Brazil
dc.description.affiliationUnespSao Paulo State Univ, Vet Med & Zootech Coll, Botucatu Campus, BR-18618681 Botucatu, SP, Brazil
dc.format.extent6
dc.identifierhttp://dx.doi.org/10.1016/j.livsci.2020.104147
dc.identifier.citationLivestock Science. Amsterdam: Elsevier, v. 240, 6 p., 2020.
dc.identifier.doi10.1016/j.livsci.2020.104147
dc.identifier.issn1871-1413
dc.identifier.urihttp://hdl.handle.net/11449/210525
dc.identifier.wosWOS:000582527300032
dc.language.isoeng
dc.publisherElsevier B.V.
dc.relation.ispartofLivestock Science
dc.sourceWeb of Science
dc.subjectStress
dc.subjectEmbryo
dc.subjectIn vitro production
dc.subjectThermoregulation
dc.titleFertility traits of recipient cows raised in the Amazon biomeen
dc.typeArtigo
dcterms.licensehttp://www.elsevier.com/about/open-access/open-access-policies/article-posting-policy
dcterms.rightsHolderElsevier B.V.
unesp.author.orcid0000-0003-1338-0949[2]
unesp.campusUniversidade Estadual Paulista (Unesp), Faculdade de Medicina Veterinária e Zootecnia, Botucatupt
unesp.departmentReprodução Animal e Radiologia Veterinária - FMVZpt

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