Search

Copyright of Journal of the Chinese Society of Animal Science is the property of Chinese Society of Animal Science and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Journal of the Chinese Society of Animal Science is the property of Chinese Society of Animal Science and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Journal of the Chinese Society of Animal Science is the property of Chinese Society of Animal Science and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

The purpose of this study was to investigate the trend and difference in daily fertilization rate (F%) of tested Pekin ducks, after 11 generations of selection with breeding value (FEBV) as crite1ion, dming the test period. These experimental ducks, at 29, 32 and 35 weeks of age, were single artificially inseminated with pooled 10 ~ 15 Muscovy semen, and eggs were candled at the 7th day of incubation to determine the F and F%. The results indicated that F was 5.13 ± 1.78, F% was 39.05 ± 13.2%, and F% decreased linearly with day after insemination and followed with polynomial y = 0.1716x³ - 3.6555x² + 12.755x + 72.078 (y : F, x: day, R² = 0.98). The daily F% decreased from 81.5% of the 2nd day to 74% of the 6th day after insemination and there were no significant differences. Then decreased from 58.3% to 8.3% (P < 0.05) on the 7th to 10th day, and there was no fertile eggs been collected on the 14th and 15th day. [ABSTRACT FROM AUTHOR]