Abstract
The thyroxine degradation rate has been determined for 308 performance-tested young bulls from 98 sires of the Red Danish and Danish Black and White breeds. The mean and genetic standard deviations were 1.09 and 0.059 μmol/day, respectively. The heritability (±S.E.) was 0.19 (±0.25). The phenotypic correlations between thyroxine degradation rate and daily weight gain and feed conversion were 0.19 and −0.13, respectively. The genetic correlations (±S.E.) were 1.11 (±0.78) and −1.26 (±1.25), respectively. Breeding value for butterfat production was available for 78 of the performance-tested bulls. The phenotypic and genetic correlations between thyroxine degradation rate and the mean butterfat production of daughter groups were 0.17 and 0.42, respectively. The genetic superiority for butterfat production will increase if thyroxine degradation rate is included as a selection criterion for performance-tested bulls.
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