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PSXIII-1 Relationship between estrus expression detected by four methods and initial GnRH treatment with pregnancy per artificial insemination in suckler cows.

Publicado en:Journal Of Animal Science. 96 (suppl 3): 361-361 - 2018-01-01 96(suppl 3), doi: 10.1093/jas/sky404.793

Casasús Pueyo, Isabel;

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Resúmen: Twenty-nine cows with suckling calves were used to compare the effectiveness of four estrus detection methods, and to determine the relationship between estrus detection and initial GnRH treatment with pregnancy per artificial insemination. On day 115 postpartum, a 12-d Ov-Synch plus PRID ALPHA (device 1.55 g progesterone) protocol was used to synchronize cows for artificial insemination on day 14. Estrus detection methods were: i) visual observation (scoring signs of primary and secondary estrus behavior); ii) ESTROTECT® mount-activated scratch-off device; iii) ALPRO® activity meter; iv) plasma progesterone (Progesterone analysis indicated that all cows were in ovarian follicular phase on the insemination day, except for two cows that had lost the PRID and were not synchronized. Progesterone was taken as gold standard for synchronization. Estrus visual detection by scoring was the most effective …

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