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Fixed-time artificial insemination in the bovine ‘Lydia Brava dos Açores’ using frozen semen

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dc.contributor.authorFaria, N.
dc.contributor.authorPacheco-Lima, J.
dc.contributor.authorValadão, L.
dc.contributor.authorMoreira da Silva, M.H.
dc.contributor.authorMoreira Silva, F.
dc.date.accessioned2023-12-21T13:21:49Z
dc.date.available2023-12-21T13:21:49Z
dc.date.issued2023
dc.descriptionReceived: September 14th, 2022 ; Accepted: June 3rd, 2023 ; Published: November 22nd, 2023 ; Correspondence: joaquim.fm.silva@uac.pteng
dc.description.abstractThe present study was designed to evaluate the use of estrus synchronization and fixedtime artificial insemination (FTAI) after synchronization of ovulation in the bovine Lidia cattle called ‘Brava dos Açores’. For such purpose, a total of 70 females was submitted to FTAI after a CIDR®-Cosynch synchronization protocol, in which on Day 0, a progesterone-impregnated internal controlled release drug (CIDR®) was inserted intravaginally, and GnRH was administered intramuscularly. After 5 or 7 days, respectively for heifers or cows, PGF2α was administered and the CIDR® removed, being the artificial insemination performed after 60 hours only once using straws containing 50 million mL of spermatozoa per straw. Before starting synchronization, all animals were vaccinated against several diseases, and only females negative for IBR/BVD, Trichomoniasis, Brucellosis, Leucosis and Campylobacteriosis were selected to be used in the experiment. Pregnancy diagnoses were performed, by ultrasonography. During the experiment, females took a routine course, to reduce the stress during the different procedures such as to place and remove the implants and the artificial insemination, because as they are known to be quite nervous, it can seriously impair seriously the results. In general, 64% of the cows became pregnant vs 40% for heifers, which can be considered satisfactory considering the nature of inseminated cattle. It can be, thus, concluded that the animal’s correct management, as well as the use of the presented protocols are fundamental to achieve the success of this technique, so that the use of these protocols and animal’s management when inseminating this type of animals is strongly recommended.eng
dc.identifier.issn2228-4907
dc.identifier.publicationAgronomy Research, 2023, vol. 21, no. 3, pp. 1107–1118eng
dc.identifier.urihttp://hdl.handle.net/10492/8784
dc.identifier.urihttps://doi.org/10.15159/ar.23.107
dc.publisherEstonian University of Life Scienceseng
dc.rightsCreative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0)eng
dc.rightsinfo:eu-repo/semantics/openAccesseng
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/4.0/
dc.subjectAzorean bovine Lidia breedeng
dc.subjectfixed-time artificial inseminationeng
dc.subjectpregnancy rateeng
dc.subjectsynchronization of ovulationeng
dc.subjectarticleseng
dc.titleFixed-time artificial insemination in the bovine ‘Lydia Brava dos Açores’ using frozen semeneng
dc.typeinfo:eu-repo/semantics/articleeng

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2023, Vol. 21, No. 3