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    Título
    Effect of the interval between estrus onset 4 and artificial insemination on sex ratio 5 and fertility in cattle: a field study
    Autor
    Martínez, Félix
    Kaabi, Mohammed
    Martínez Pastor, FelipeAutoridad BuleriaORCID
    Álvarez García, MercedesAutoridad BuleriaORCID
    Anel Rodríguez, Enrique
    Boixo, Juan C.
    Paz Cabello, Paulino deAutoridad BuleriaORCID
    Anel Rodríguez, LuisAutoridad BuleriaORCID
    Facultad/Centro
    Facultad de Ciencias Biologicas y Ambientales
    Área de conocimiento
    Biologia Celular
    Datos de la obra
    Theriogenology, 2004, vol. 62, n. 7
    Editor
    Elsevier
    Fecha
    2004-10-01
    Abstract
    We have carried out a field trial in cattle to study the effect of the interval between the onset of estrus and AI on sex ratio and fertility. Data were obtained from 716 cows that had been inseminated at different times between 8 and 44 h from the visual detection of estrus. Before analyzing the data, it was grouped in three intervals considering the time between estrus onset and AI (8–18, 18–30, and ≥30 h). Our results show that the percentage of calved females (73.05%) is significantly superior for early inseminations (8–18 h), and it decreases 1.85% per hour from the onset of estrus. Delayed AIs (≥30 h) produce a significant deviation of the sex ratio towards the males (72.06%); nevertheless, fertility (percentage of successful pregnancies) diminishes significantly, from 66.19% (8–18 h) to 45.35% (≥30 h). In conclusion, variations in the interval between the onset of estrus and AI modify sex ratio. However, we must consider its effect on fertility.
    Materia
    Veterinaria
    Palabras clave
    Cattle
    Artificial insemination
    Estrus detection
    Estrus onset
    Sex ratio
    Field trial
    Peer review
    SI
    URI
    http://hdl.handle.net/10612/10230
    Versión del editor
    https://www.sciencedirect.com/science/article/pii/S0093691X04000135#!
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