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. 2020 Mar 19;99(6):3207–3214. doi: 10.1016/j.psj.2020.01.028

Table 4.

Effects of dietary Ca and NPP levels on tibia ALP activity and ash Ca and P contents of broilers1.

Ca levels, %
 1.00
 0.35
 SEM Ca level3, %
 SEM NPP level3, %
 SEM P-value
NPP levels, % 0.452 0.232 0.452 0.232 1.00 0.35 0.45 0.23 Ca NPP Ca × NPP
Day 7
 Tibia ALP, U/g protein 595 793 399 595 44 694a 497b 32 497b 694a 32 0.0002 0.0002 0.99
 Tibia ash Ca content, % 38.4a 33.7b,c 34.4b 33.0c 0.3 36.0 33.7 0.2 36.5 33.4 0.2 ＜0.0001 ＜0.0001 ＜0.0001
 Tibia ash P content, % 16.6 15.6 17.4 16.6 0.24 16.1b 17.0a 0.2 17.0a 16.1b 0.2 0.001 0.001 0.94
Day 14
 Tibia ALP, U/g protein 352c 661a 458b 466b 34 507 462 24 405 564 24 0.20 ＜0.0001 0.0002
 Tibia ash Ca content, % 35.3a 34.0b 31.8c 31.8c 0.2 34.7 31.8 0.1 33.6 33.0 0.1 ＜0.0001 0.0002 0.001
 Tibia ash P content, % 16.7 16.2 16.1 15.8 0.1 16.5a 15.9b 0.1 16.4a 16.0b 0.1 0.0002 0.007 0.46
Day 21
 Tibia ALP, U/g protein 254c 508a 491a,b 426b 26 459 381 18.6 373 467 19 0.007 0.002 ＜0.0001
 Tibia ash Ca content, % 36.2a 33.7b 31.1d 32.5c 0.2 35.1 31.8 0.1 33.7 33.0 0.1 ＜0.0001 0.001 ＜0.0001
 Tibia ash P content, % 16.7c 16.2d 17.4b 17.6a 0.1 16.4 17.5 0.1 17.0 16.9 0.1 ＜0.0001 0.38 0.0008

a-dMeans within a row lacking a common superscript differ (P < 0.05).

1

Abbreviations: ALP, alkaline phosphatase; NPP, nonphytate P.

2

Data represented the means of 7 replicate cages (n = 7).

3

Data represented the means of 12 replicate cages (n = 14).