The rate of return to estrus was greater in sows with ovarian cysts (P < 0.001). This
factor indicates that cysts appear to be an important risk factor for returning to estrus. Out
of the 47 sows with ovarian cysts, 16 (34.0%) returned to estrus in a regular or an irregular
cycle, 2 (4.3%) had an abortion (days 34 and 42 of pregnancy), 24 (51.1%) farrowed and
5 (10.6%) were not in pregnant (i.e., when they were expected to farrow). These latter
sows were not pregnant, with anestrus. Data for the results on reproductive performance
comparing females with or without cysts are included in Table 2. During the time the trial
was performed, the return to estrus rate was 9.7 and 7.6% in farms A and B, respectively.
In the sows that had ovarian cysts, some of them had a reproductive performance similar to
the other sows, a situation that had previously been described by Dorka and Plonait (1995).
These previous authors suggested that sows with cystic ovaries could maintain normal
ovarian cycles and conceive.
The rate of return to estrus was greater in sows with ovarian cysts (P < 0.001). Thisfactor indicates that cysts appear to be an important risk factor for returning to estrus. Outof the 47 sows with ovarian cysts, 16 (34.0%) returned to estrus in a regular or an irregularcycle, 2 (4.3%) had an abortion (days 34 and 42 of pregnancy), 24 (51.1%) farrowed and5 (10.6%) were not in pregnant (i.e., when they were expected to farrow). These lattersows were not pregnant, with anestrus. Data for the results on reproductive performancecomparing females with or without cysts are included in Table 2. During the time the trialwas performed, the return to estrus rate was 9.7 and 7.6% in farms A and B, respectively.In the sows that had ovarian cysts, some of them had a reproductive performance similar tothe other sows, a situation that had previously been described by Dorka and Plonait (1995).These previous authors suggested that sows with cystic ovaries could maintain normalovarian cycles and conceive.
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