Heritability estimates for semen volume in medium white turkeys Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/z029p805w

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  • A population of Wrolstad strain Medium White turkeys has been divergently selected for low and high mean semen volume for 13 generations. A mean volume difference of .34 mis. was obtained in the 13th generation; with the low line averaging .21 mis. and the high .55 mis. Heritability estimates determined by the full sib correlation method averaged .61 ± .13 and .54 ± .15 for the low and high lines, respectively. Realized heritabiIities for semen volume were calculated by four different methods. With the first two methods, the high and low lines were kept separate. The third and fourth methods utilized divergent selection by measuring the response as the difference between the two lines. The realized heritability, calculated as the ratio of the total response divided by the total selection differential for semen volume in the low and high lines, were 1.47 ± .40 and .35 ± .08, respectively. The realized heritability calculated by the regression of the cumulative response on the cumulative selection differential in the low and high lines were 1.34 ± .42 and .41 ± .08, respectively. The realized heritability of the total difference in semen volume between lines divided by the total selection differential was .71 ± .03. The realized heritability of the cumulative difference between lines when regressed on the cumulative selection differential was .68 .± .06. This study showed that the heritability of mean semen volume is moderate to high, and that selection for increased semen volume in turkeys was successful.
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  • description.provenance : Approved for entry into archive by Deborah Campbell(deborah.campbell@oregonstate.edu) on 2013-07-11T15:06:08Z (GMT) No. of bitstreams: 1 HalesLaviniaA1988.pdf: 346325 bytes, checksum: 55dbaba0a0efcda18ce9074cc6743925 (MD5)
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  • description.provenance : Made available in DSpace on 2013-07-11T15:06:08Z (GMT). No. of bitstreams: 1 HalesLaviniaA1988.pdf: 346325 bytes, checksum: 55dbaba0a0efcda18ce9074cc6743925 (MD5) Previous issue date: 1987-07-24

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