caa a22 4500 388060042 CHVBK 20180307125118.0 cr unu---uuuuu 161130e199812 xx s 000 0 eng 10.1017/S1357729800032859 doi S1357729800032859 pii (NATIONALLICENCE)cambridge-10.1017/S1357729800032859 A terminal sire selection index for UK beef cattle [Elektronische Daten] A selection index which incorporates estimated breeding values of traits recorded in the United Kingdom pedigree beef cattle breeds is described. The breeding objective is made up of commercial carcass, calving difficulty and gestation length traits. Economic values for these breeding objective traits are summarized from related studies, while partial genetic regression estimates of breeding objective traits on recorded traits are derived mainly from the literature. The selection index is described in terms of the reduction in expected genetic response from selection on the index when individual recorded traits are omitted and the expected genetic responses in breeding objective traits with selection on the index under the assumption of mass selection. Failure to record all calving traits (birth weight, calving difficulty and gestation length) resulted in a reduction in expected economic response to selection of 8% from the situation where both calving traits and production traits (400-day weight, ultrasonic fat and muscle depths, and muscling score) are recorded. With a few stated exceptions, the index is relatively robust to errors in estimates of individual parameters. It is suggested that the total index be used to assist commercial bull and semen buyers in their selection decisions but that two sub-indices for calving and production traits also be published to allow buyers to adjust emphasis on the two groups of traits depending on their individual production circumstances. Copyright © British Society of Animal Science 1998 beef cattle nationallicence selection index nationallicence terminal sire nationallicence Amer P. R. Scottish Agricultural College, West Mains Road, Edinburgh EH9 3JG Crump R. Roslin Institute (Edinburgh), Roslin, Midlothian EH25 9PS Simm G. Scottish Agricultural College, West Mains Road, Edinburgh EH9 3JG Animal Science Cambridge University Press 67/3(1998-12), 445-454 1357-7298 67:3<445 1998 67 ASC https://doi.org/10.1017/S1357729800032859 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1017/S1357729800032859 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Amer P. R. Scottish Agricultural College, West Mains Road, Edinburgh EH9 3JG NATIONALLICENCE 700 1- Crump R. Roslin Institute (Edinburgh), Roslin, Midlothian EH25 9PS NATIONALLICENCE 700 1- Simm G. Scottish Agricultural College, West Mains Road, Edinburgh EH9 3JG NATIONALLICENCE 773 0- Animal Science Cambridge University Press 67/3(1998-12), 445-454 1357-7298 67:3<445 1998 67 ASC CC0 http://creativecommons.org/publicdomain/zero/1.0 nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-cambridge