Table 6.
Mean isotopic enrichment of Phe in protein-bound pools and fractional synthesis rate of protein in select tissues on day 17 of lactation for primiparous sows fed control or low CP diets
| Item | Diet | SEM1 | P value | |
|---|---|---|---|---|
| CON2 | LCP | |||
| Number of sows3 | 5 | 6 | — | — |
| Protein-bound enrichment, mol % | ||||
| Liver | 1.63 | 1.70 | 0.10 | 0.588 |
| Mammary gland4 | 4.40 | 4.13 | 0.30 | 0.529 |
| LM | 0.15 | 0.18 | 0.01 | 0.068 |
| Gastrocnemius | 0.18 | 0.22 | 0.03 | 0.259 |
| Protein fractional synthesis rate, %/d | ||||
| Liver | 29.9 | 28.2 | 0.18 | 0.586 |
| Mammary gland4 | 66.9 | 55.8 | 0.98 | 0.267 |
| LM | 2.21 | 2.20 | 0.20 | 0.993 |
| Gastrocnemius | 2.44 | 2.56 | 0.32 | 0.792 |
| Casein fractional synthesis rate, %/d5 | 128 | 127 | 11 | 0.923 |
| Casein fractional degradation rate, %/d5 | 28 | 27 | 11 | 0.923 |
| Liver weight, kg6 | 3.96 | 3.45 | 0.14 | 0.039 |
| Liver weight, % of BW | 2.21 | 2.11 | 0.12 | 0.552 |
1Maximum value of the SEM.
2CON = control, 16.2% CP (as-fed; analyzed contents); LCP = low crude protein, 12.7% CP.
3One sow was removed due to catheter malfunction.
4The litter was allowed to suckle after administration of 5 IU oxytocin to facilitate milk removal before euthanasia and tissue collection.
5 n = 3 for CON-fed sows.
6Wet weight after euthanasia; n = 6 for each CON and LCP.