Resumo

KONRAD, J.L.  e  CRUDELI, G.A.. Utilización de la ultrasonografía para determinar el estado genital en la sincronización e inseminación artificial en vacas. Rev. vet. [online]. 2018, vol.29, n.1, pp.18-21. ISSN 1669-6840.  http://dx.doi.org/10.30972/vet.2912781.

The objective of the study was to evaluate the use of estrous control treatments, determining genital status by ultrasonography, efficiency of detection and distribution of heat, and pregnancy in artificially inseminated cows. The work was carried out with 380 females. The cows was classified by ultrasonography according to the present ovarian structures and assigned to each treatment. In the treatment 1 were included cows that presented corpus luteum; was applied a dose of prostaglandin and from the next day was held the heat detection and artificial insemination for seven days. For the treatment 2 were used cows who had follicles ≥ 8 millimeters of diameter, was applied a dose of gonadotrifins releasing hormone, seven days after was applied a dose of prostaglandin and proceeded to the heat detection and artificial insemination for seven days. In the treatment 3 was performed the fixed-time artificial insemination with cows who had follicles ≥ 8 millimeters or corpus luteum. The treatment 4 or control was made with cows who had follicles ≥ 8 millimeters or corpus luteum, was performed artificial insemination with heat detection during twenty one days without the application of some drugs. The heat detection rate was 81,8%, 84,5% and 46% for treatments 1, 2 and 4 respectively (p<0,05). The conception rates were 59,26%; 65,59%; 34,02% and 65,22% (p<0,05) for treatments 1, 2, 3 and 4, the pregnancy for insemination in each treatment were 48,48%, 55,45%, 34,02% and 30% (p>0,05) respectively. The use of hormonal treatments improved the percentage of cows detected in estrus, and pregnancy by insemination was higher in treatments where detected estrus and inseminated

Palavras-chave : boar; conservation of semen; antioxidant; melatonin.

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