caa a22 4500 386320705 CHVBK 20180307111625.0 cr unu---uuuuu 161130e198802 xx s 000 0 eng 10.1017/S0003356100003147 doi S0003356100003147 pii (NATIONALLICENCE)cambridge-10.1017/S0003356100003147 Estimation of sire with feeding regime interaction in pigs [Elektronische Daten] The interaction of sire with feeding regime (ad libitum and restricted) was assessed in the first stage of a selection experiment. There were 79 sires (59 Large White (Edinburgh) and 20 British Landrace (Wye)) with 1549 progeny (745 at Edinburgh and 804 at Wye) in the study. Progeny within each litter were allocated at random to each feeding regime. Pigs started test at 30 (± 3) kg and finished test at 85 (± 5) kg for ad libitum fed pigs or after 84 days on test for restricted fed pigs. All pigs were individually penned. At the end of test, food intake, weight off test and ultrasonic backfat depths were recorded. Variance components were estimated using restricted maximum likelihood and a weighted analysis took account of the different residual variances between feeding regimes, within each breed. There were differences in some genetic parameters due to feeding regime within breeds. No evidence of a sire with feeding regime interaction for average daily gain or food conversion ratio was detected in Large White pigs (genetic correlations between ad libitum and restricted feeding were 1·21 (s.e. 0·17) and 0·89 (s.e. 0·19) respectively). Similar conclusions could not be made for the sample of British Landrace pigs due to the large standard errors of the genetic correlation estimates. For ultrasonic backfat depths, the negative estimates of sire variances under restricted feeding prevent calculation of the genetic correlations and conclusions to be made about the sire with feeding regime interaction. Copyright © British Society of Animal Science 1988 Cameron N. D. AFRC Institute of Animal Physiology and Genetics Research, Edinburgh Research Station, West Mains Road, Edinburgh EH9 3JQ Curran M. K. Wye College, University of London, Wye, Kent TN25 5AH Thompson R. AFRC Institute of Animal Physiology and Genetics Research, Edinburgh Research Station, West Mains Road, Edinburgh EH9 3JQ Animal Production Cambridge University Press 46/1(1988-02), 87-95 0003-3561 46:1<87 1988 46 ASC https://doi.org/10.1017/S0003356100003147 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1017/S0003356100003147 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Cameron N. D. AFRC Institute of Animal Physiology and Genetics Research, Edinburgh Research Station, West Mains Road, Edinburgh EH9 3JQ NATIONALLICENCE 700 1- Curran M. K. Wye College, University of London, Wye, Kent TN25 5AH NATIONALLICENCE 700 1- Thompson R. AFRC Institute of Animal Physiology and Genetics Research, Edinburgh Research Station, West Mains Road, Edinburgh EH9 3JQ NATIONALLICENCE 773 0- Animal Production Cambridge University Press 46/1(1988-02), 87-95 0003-3561 46:1<87 1988 46 ASC CC0 http://creativecommons.org/publicdomain/zero/1.0 nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-cambridge