2024-03-28T08:34:26Zhttp://buleria.unileon.es/oai/requestoai:buleria.unileon.es:10612/102302020-12-10T09:01:08Zcom_10612_17col_10612_18
Martínez, Félix
Kaabi, Mohammed
Martínez Pastor, Felipe
Álvarez García, Mercedes
Anel Rodríguez, Enrique
Boixo, Juan C.
Paz Cabello, Paulino de
Anel Rodríguez, Luis
2019-04-14T23:31:08Z
2019-04-14T23:31:08Z
2019-04-15
Theriogenology, 2004, vol. 62, n. 7
https://www.sciencedirect.com/science/article/pii/S0093691X04000135#!
http://hdl.handle.net/10612/10230
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.
Veterinaria
Effect of the interval between estrus onset 4 and artificial insemination on sex ratio 5 and fertility in cattle: a field study
info:eu-repo/semantics/article