Relationships between the characteristics weaning-to-estrus interval, estrus duration and moment of ovulation by ultrasonography in sows
Keywords:Oestrus, Ovulation, Ultrasonography, Swine
AbstractRelationships between weaning-to-estrus interval (WEI), duration of estrus (DE) and moment of ovulation (MO) were studied. A total of 236 sows were observed to record the data of WEI and DE, which were tested by back pressure 4 times a day, in the presence of a boar. The ovulation was diagnosed in 77 sows, by transcutaneous ultrasonography, 3 times a day at 8-hour interval. There was negative correlation between WEI and DE (r=-0.4657; p=0.0001) and between WEI and MO (r=-0.3955; p=0.0004), however, there was no correlation between DE and MO (r=0.2201; p=0.0578). The percentage of females that ovulated between 0 to 24, 24 to 48, 48 to 72 and over 72 hours after the onset of estrus was, respectively, 0%, 58.4%, 37.5% and 4.2% to WEI of 3 days, 3.2%, 67.7%, 29.2% and 0% to WEI of 4 days, 0%, 91.6%, 8.3% e 0% to WEI of 5 days and 10%, 90%, 0% and 0% to WEI of 6 and 7 days. In these conditions, the WEI was not a good reference to be utilized as a predictor of ideal moment of insemination. However, the information about the characteristics WEI, DE and MO within each herd help to point the mistakes and to develop AI programs.
Download data is not yet available.
How to Cite
Viana, C. H. C., Silveira, P. R. S. da, Moretti, A. S., & Rodrigues, P. H. M. (1999). Relationships between the characteristics weaning-to-estrus interval, estrus duration and moment of ovulation by ultrasonography in sows. Brazilian Journal of Veterinary Research and Animal Science, 36(4), 212-218. https://doi.org/10.1590/S1413-95961999000400008
The journal content is authorized under the Creative Commons BY-NC-SA license (summary of the license: https://