caa a22 4500 386320950 CHVBK 20180307111626.0 cr unu---uuuuu 161130e198808 xx s 000 0 eng 10.1017/S0003356100037156 doi S0003356100037156 pii (NATIONALLICENCE)cambridge-10.1017/S0003356100037156 Selection in pigs for increased lean growth rate on a time-based feeding scale [Elektronische Daten] Selection was carried out in a line of pigs for increased growth rate of lean tissue. The selection criterion was weight of lean in the ham predicted from live backfat and weight measurements after a 12-week performance test commencing at 25 kg live weight. All pigs were given the same total amount of food over the test period. The scale was set to about proportionately 0·85 of predicted ad libitum intake. Boars selected with an intensity of 1/12 were used for 6 months and sows selected with an intensity of 1/4 were kept for two farrowings. An unselected control line was maintained concurrently. After five generations, performances of selected and control line pigs were compared on ad libitum and scale feeding as they grew to 85 kg. Responses in the selected line on scale feeding were +51 g/day for growth rate (GR), −0·16 for food conversion ratio (FCR), −2·2 mm for backfat (F) and +0·47 kg for ham lean (HL). On ad libitum feeding, responses were much higher in the selected line, giving rise to line × food interactions. Responses were +128 g/day for GR, −0·27 for FCR, −2·3 mm for F, +1·01 kg for HL and +0·15 kg/day for food intake (FI). Estimates of the heritability of HL from variance components were 0·43 (s.e. 0·15) on scale feeding and 0·28 (s.e. 0·19) on ad libitum feeding. The realized heritability of HL on scale feeding was 0·29 (s.e. 0·04) and its co-heritabilities with the other traits on both feeding levels were of similar magnitude to its heritability. Scale feeding exposed genetic variation in the partitioning of food between lean and fat deposition and appeared to be a suitable selection regimen for performance on ad libitum feeding. Copyright © British Society of Animal Science 1988 McPhee C. P. Department of Primary Industries, Animal Research Institute, 665 Fairfield Road, Yeerongpilly, Queensland 4105, Australia Rathmell G. A. Department of Primary Industries, Animal Research Institute, 665 Fairfield Road, Yeerongpilly, Queensland 4105, Australia Daniels L. J. Department of Primary Industries, Animal Research Institute, 665 Fairfield Road, Yeerongpilly, Queensland 4105, Australia Cameron N. D. AFRC Institute of Animal Physiology and Genetics Research, Edinburgh Research Station, West Mains Road, Edinburgh EH9 3JQ Animal Production Cambridge University Press 47/1(1988-08), 149-156 0003-3561 47:1<149 1988 47 ASC https://doi.org/10.1017/S0003356100037156 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1017/S0003356100037156 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- McPhee C. P. Department of Primary Industries, Animal Research Institute, 665 Fairfield Road, Yeerongpilly, Queensland 4105, Australia NATIONALLICENCE 700 1- Rathmell G. A. Department of Primary Industries, Animal Research Institute, 665 Fairfield Road, Yeerongpilly, Queensland 4105, Australia NATIONALLICENCE 700 1- Daniels L. J. Department of Primary Industries, Animal Research Institute, 665 Fairfield Road, Yeerongpilly, Queensland 4105, Australia NATIONALLICENCE 700 1- Cameron N. D. 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 47/1(1988-08), 149-156 0003-3561 47:1<149 1988 47 ASC CC0 http://creativecommons.org/publicdomain/zero/1.0 nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-cambridge