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Table 7 Expected response per generation in body weight (BW), backfat thickness (BT) and intramuscular fat (IMF) to selection for BW, BT, IMF at restricted BT (ΔBT = 0) and C18:2 (mg/g of dry muscle) on a basic pig breeding scheme when records used for selection were taken only on the selected traits or on all traits a

From: Linoleic acid metabolic pathway allows for an efficient increase of intramuscular fat content in pigs

Selection criterion Expected response
BW, kg BT, mm IMF, %
Records on selected traits b
 IMF 100 100 100
 BT 644 681 70
 IMF at ΔBT = 0 6 0 92
 C18:2 mg/g 32 21 87
Records on all traits c
 IMF 100 100 100
 BT 156 165 61
 IMF at ΔBT = 0 6 0 80
 C18:2 mg/g 35 24 83
  1. aThe breeding scheme consisted of one selection stage resulting in the top 25% males and 50% females of the offspring of 40 boars and 400 sows (ratio of 1 boar to 10 sows). Two males and two females from the offspring of each sow were performance-tested for BW and BT and three paternal half-sibs of different dams were used for IMF and C18:2 determinations. Pigs were selected for one trait at a time, but using the records taken only on the traits included in the selection criterion or in all traits
  2. bResponses in percentage relative to responses to selection for IMF (0.39 kg, 0.21 mm and 0.40%, for BW, BT and IMF, respectively), which are set to 100
  3. cResponses in percentage relative to responses to selection for IMF (1.51 kg, 0.88 mm and 0.46%, for BW, BT and IMF, respectively), which are set to 100