Effect of gynecological screening on rates of conception and gestation total of Nellore cows submitted to three protocols for fixed-time artificial insemination (TAI)
ABSTRACT. Grillo G.F., Guimarães A.L.L., Soares J.R., Mello M.R.B., Alonso L.S., Abidú-Figueiredo M. & Palhano H.B. [Effect of gynecological screening on rates of conception and gestation total of Nellore cows submitted to three protocols for fixed-time artificial insemination (TAI).] Efeito da triagem ginecológica sobre as taxas de concepção e gestação total de vacas Nelore submetidas a três protocolos de inseminação artificial em tempo fixo (IATF). Revista Brasileira de Medicina Veterinária, 37(3):250-254, 2015. Área de Anatomia, Departamento de Biologia Animal, Instituto de Biologia, Universidade Federal Rural do Rio de Janeiro, Campus Seropédica, BR 465 km 7, Seropédica, RJ 23890-000, Brasil. Email: email@example.com The aim of this study was to assess the rates of total conception and gestation of Nellore cows total, commercial herd in the region of the coastal plains of the state of RJ, subjected to three hormonal protocols for synchronization of ovulation with screening of females for inclusion in the TAI program. Two hundred and six lactating females with multiple calvings history were used (60 to 100 days after parturition), divided into four groups: I - Ovsynch, n = 55, II - Ovsynch + progesterone, n = 55, III - EB. + P4 + eCG, n = 48, IV - EB. + P4 + eCG, n = 48. All females were exposed to bulls of Simmental breed, from 24 hours to pass after TAI. The conception rates and pregnancy rates were 45.5% overall (25:55) and 81.8% (45:55) for group I, 61.8% (34:55) and 87.3% (48 : 55) for group II, 62.5% (30:48) and 87.5% (42:48) for group III, 60.4% (29:48) and 83.3% (40:48) for group IV, respectively. The results, after analysis by the chi- -square showed no significant difference (p> 0.05) among protocols, as compared to the conception and pregnancy rates after transfer with total bulls. Thus, the use of gynecological screening for insertion of cows in the TAI program of the respective property, allows adaptation of the protocols for ovarian function, providing good pregnancy rates independent of the protocol used.
Authors retain the copyright and grant the journal the right of first publication, with the work simultaneously licensed under the Creative Commons Attribution License (CC BY-NC 4.0), allowing the sharing of work with acknowledgement of the authorship of the work and initial publication in this journal. They may take additional contracts separately, with acknowledgement of authorship and initial publication in this journal. They are authorized to publish and distribute their work online after publication by BJVM.
The AUTHOR is informed and agrees with the journal that, therefore, its article may be incorporated into existing databases and scientific information systems (indexers and current databases) or existing in the future (indexers and future databases), under the conditions defined by the latter at all times, which shall at least involve the possibility that the holders of these databases may perform the following actions on the article: Reproduce, transmit and distribute the article, in whole or in part in any form or means of electronic transmission existing or developed in the future, including electronic transmission for research, viewing and printing purposes; extract figures, tables, illustrations, and other graphic objects, and capture metadata, captions, and related articles for search, preview, and print purposes. Scan and/or store images and electronic article text.