RT info:eu-repo/semantics/article
T1 Effect of the interval between estrus onset 4 and artificial insemination on sex ratio 5 and fertility in cattle: a field study
A1 Martínez, Félix
A1 Kaabi, Mohammed
A1 Martínez Pastor, Felipe
A1 Álvarez García, Mercedes
A1 Anel Rodríguez, Enrique
A1 Boixo, Juan C.
A1 Paz Cabello, Paulino de
A1 Anel Rodríguez, Luis
A2 Biologia Celular
K1 Veterinaria
K1 Cattle
K1 Artificial insemination
K1 Estrus detection
K1 Estrus onset
K1 Sex ratio
K1 Field trial
AB 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.
PB Elsevier
YR 2019
FD 2019-04-15
LK http://hdl.handle.net/10612/10230
UL http://hdl.handle.net/10612/10230
NO Theriogenology, 2004, vol. 62, n. 7
NO P. 1264-1270
DS BULERIA. Repositorio Institucional de la Universidad de León
RD 16-may-2024