Table 2.
The effects of genotype, housing system, and feed Ca level and their interaction on hen performance parameters and egg weight.
| Factor | Item | Hen-Day Egg Production (%) |
Daily Feed Intake (g) |
Daily Ca Intake (g) |
Egg Weight (g) |
|
|---|---|---|---|---|---|---|
| Effect of Individual Factors | ||||||
| Genotype RMSE |
ISA Brown | 84.2 a | 146 c | 4.72 c | 61.5 c | |
| Bovans Brown | 71.4 c | 175 b | 5.71 b | 63.2 a | ||
| Moravia BSL | 74.3 b | 186 a | 6.01 a | 62.6 b | ||
| 20.3 | 67.5 | 2.19 | 6.10 | |||
| Housing RMSE |
Littered floor | 74.6 b | 193 a | 6.32 a | 62.9 a | |
| Enriched cages | 80.2 a | 125 b | 4.13 b | 61.7 b | ||
| 20.8 | 61.3 | 1.99 | 6.12 | |||
| Ca RMSE |
3.00 | 73.7 b | 172 | 5.64 | 62.1 | |
| 3.50 | 79.6 a | 166 | 5.46 | 62.1 | ||
| 20.8 | 69.3 | 2.25 | 6.14 | |||
| p-value | Genotype | *** | ** | ** | *** | |
| Housing | * | *** | *** | *** | ||
| Ca | * | NS | NS | NS | ||
| Analysis of Interaction between the Factors | ||||||
| ISA Brown | Littered floor | 3.00 | 78.4 b | 157 bc | 5.11 bc | 62.7 bc |
| 3.50 | 85.8 ab | 162 bc | 5.26 bc | 62.5 bc | ||
| Enriched cages | 3.00 | 86.1 ab | 122 d | 3.98 d | 60.4 cd | |
| 3.50 | 89.6 a | 122 d | 3.98 d | 59.2 d | ||
| Bovans Brown | Littered floor | 3.00 | 65.9 c | 191 b | 6.21 ab | 64.3 a |
| 3.50 | 80.3 b | 210 ab | 6.83 ab | 61.9 c | ||
| Enriched cages | 3.00 | 55.8 d | 126 cd | 4.11 b | 63.3 ab | |
| 3.50 | 80.2 b | 129 cd | 4.22 b | 63.4 ab | ||
| Moravia BSL | Littered floor | 3.00 | 64.9 c | 217 a | 8.04 a | 62.8 ab |
| 3.50 | 72.4 bc | 191 b | 6.21 ab | 63.5 ab | ||
| Enriched Cages | 3.00 | 86.8 ab | 126 cd | 4.12 cd | 61.3 cd | |
| 3.50 | 82.3 ab | 124 cd | 4.05 cd | 62.4 bc | ||
| RMSE | 19.2 | 57.7 | 1.88 | 6.02 | ||
|
p-value Genotype × Housing |
* |
* |
* |
*** |
||
| Genotype × Ca | ** | NS | NS | NS | ||
| Housing × Ca | NS | NS | NS | NS | ||
| Genotype × Housing × Ca | *** | ** | ** | *** | ||
Results of the variance analysis are indicated as significant (* p ≤ 0.05, ** p ≤ 0.01, *** p ≤ 0.001) or not significant (NS). a,b,c,d Mean values in the same column marked with a different superscript indicate statistical significance (p ≤ 0.05). Mean values with no superscript are not significantly different from any other values. RMSE: Root Mean Square Error.