Table 2.
Effects of dietary hydrolyzed yeast on egg production and feed intake in aged laying hens1

Hydrolyzed yeast (%) SEM P values
0 0.1 0.2 Linear Quadr. ANOVA
Egg production (%)
 1∼4 wk 79.5 82.8 79.8 0.02 0.918 0.267 0.527
 5∼8 wk 75.7b 83.2a 82.3a 0.02 0.016 0.069 0.015
 Total period 77.3 83.0 81.3 0.02 0.152 0.131 0.124
Egg weight (g/egg)
 1∼4 wk 63.0 63.2 62.5 0.57 0.515 0.542 0.667
 5∼8 wk 63.9 63.3 62.6 0.52 0.102 0.949 0.250
 Total period 63.5 63.2 62.5 0.51 0.217 0.715 0.428
Egg mass
 1∼4 wk 50.0 48.5 49.1 1.56 0.976 0.259 0.518
 5∼8 wk 52.2b 52.7a 52.5ab 1.15 0.066 0.077 0.047
 Total period 50.0 51.7 50.9 1.25 0.342 0.121 0.194
Feed intake (g/bird/d)
 1∼4 wk 119.0 118.2 117.6 1.26 0.429 0.937 0.721
 5∼8 wk 111.1b 118.4a 117.1a 1.28 0.005 0.015 0.002
 Total period 115.1 118.4 117.4 1.22 0.202 0.176 0.184
Data are least square of mean of 6 replicate with 2 cages with 5 birds per cage.
Mean values within a row with different superscripts differ at P<0.05.