Repeatability of response to superovulation in Brangus cows.
Repeatabilities of total numbers of ova (TO) and morphologically normal embryos (MNE) recovered following superovulation of Brangus cows were estimated from records of 210 attempts involving 75 cows. Repeatability of the number of TO recovered was 0.22 +/- 0.08 and the number of MNE recovered was 0.19 +/- 0.08. Overall mean numbers of TO and MNE were 9.0 and 5.0, respectively. The mean numbers of TO recovered were 8.9 from the first treatment, 9.5 from the second treatment, and 8.6 from the third treatment. The mean numbers of MNE recovered were 5.2 from the first treatment, 4.6 from the second treatment, and 5.2 from the third treatment. Regressions of TO or MNE numbers per collection indicated that the superovulatory response did not decline significantly with repeated superovulation.
Lamberson
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Department of Animal Science University of Missouri, Columbia, MO 65211 USA.
Lambeth
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VA