Accelerated Growth Rate Induced by Neonatal High-Protein Milk Formula Is Not Supported by Increased Tissue Protein Synthesis in Low-Birth-Weight Piglets
Table 6
Proteasome, calpain, and cathepsin L activities (RFU/min/mg protein) measured in various tissues of piglets fed NP, HP, and HPA diets at d7 and d28.
d7
d28
Age effect
NP
HP
HPA
SEM
P
NP
HP
HPA
SEM
P
Proteasome activity, RFU/min/mg protein
Proximal jejunum mucosa
25908
25569
26586
718
ns
31343
25827
26137
2445
ns
ns
Distal ileum mucosa
21828
23123
21803
1592
ns
26196
23846
22263
3266
ns
ns
Liver
12499
12848
12767
662
ns
13352a
11808b
11117b
647
0.07
ns
Semitendinosus muscle
634
783
691
56
ns
497
376
578
67
ns
<0.001
Calpain activity, RFU/min/mg protein
Proximal jejunum mucosa
6469
6842
6794
647
ns
9307
8640
9460
925
ns
<0.001
Distal ileum mucosa
8944
9962
7819
1588
ns
12427
14015
14552
2792
ns
0.02
Liver
11505
11649
12054
914
ns
11045a
7451b
6884b
948
0.01
<0.001
Semitendinosus muscle
529
505
561
92
ns
382
308
524
69
ns
0.06
Cathepsin L activity, RFU/min/mg protein
Proximal jejunum mucosa
1286
989
1136
393
ns
2511
2943
4125
978
ns
<0.01
Distal ileum mucosa
3041
2971
5642
1091
ns
2965
3019
6085
1127
ns
ns
Liver
2333
3358
2415
609
ns
3889
2301
2530
868
ns
ns
Semitendinosus muscle
965
2237
1068
113
ns
732
572
632
109
ns
<0.001
Values are least square means and pooled SEM calculated in pigs slaughtered at d7 and d28, /group. P (effect of formula) and age effects are presented. Differences were considered significant when but trends are presented when 0.1 < . Means with a different superscript letter differ at .