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Table 5 Myofiber characteristics in the Semitendinosus muscle of selected offspring born from oviduct ligated (OL; non crowded) and intact (IN; relatively crowded) sows fed an unsupplemented (Ctrl) or l-arginine supplemented diet (ARG) from d 14 to 28 of gestation1

From: Impact of dietary l-arginine supply during early gestation on myofiber development in newborn pigs exposed to intra-uterine crowding

  IN OL    P-value2  
Item Ctrl ARG Ctrl ARG SEM IUC DIET BtW IUC×DIET DIET×BtW
Observations 19 19 17 15       
Muscle area, μm2 × 107           
 Total 5.762 6.780 7.505 8.795 0.9429 0.144 0.003 0.653 0.738 0.053
 Dark portion 2.359x 2.278x 2.772ax 3.572by 0.2931 0.078 0.025 0.233 0.007 0.573
 Light portion 3.151 4.118 4.906 5.677 0.8279 0.143 0.011 0.910 0.786 0.061
Myofiber number, N           
 Total muscle 476,025 527,711 536,451 607,928 35,511.0 0.236 0.003 0.136 0.604 0.475
 Dark portion           
  Total myofibers 193,928 198,254 184,590 218,604 22,898.2 0.884 0.131 0.002 0.231 0.560
  Primary myofibers (P) 6,105 5,840 5,868 6,156 638.8 0.970 0.974 0.069 0.422 0.575
  Secondary myofibers (S) 187,823 192,414 178,722 212,448 22,455.9 0.883 0.124 0.002 0.231 0.559
  S:P ratio3 30.8 33.2 30.6 34.4 2.86 0.912 0.051 0.356 0.643 0.337
 Light portion 282,097 329,457 351,860 389,324 32,639.6 0.234 0.022 0.889 0.778 0.236
  1. 1Results are presented as least squares means of interactions between the two main factors extent of intra uterine crowding and dietary treatment and pooled SEM
  2. 2Probability values for the effects of extent of intra uterine crowding (IUC), dietary treatment (DIET), birth weight (BtW), and interactions IUC × DIET and DIET × BtW
  3. 3The secondary-to-primary myofiber ratio, calculated by dividing the number of secondary with the number of primary myofibers in the dark portion of the Semitendinosus muscle.
  4. a,bWithin a row for the main factor treatment, least squares means without a common superscript differ (P < 0.05)
  5. x,yWithin a row for the main factor treatment, least squares means without a common superscript differ (0.05 < P < 0.10)