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. 2020 Jun 17;99(8):3897–3907. doi: 10.1016/j.psj.2020.05.010

Table 4.

Effect of 2 eggshell temperatures (EST; 37.8°C, 38.9°C) applied during week 2 and 2 EST (36.7°C, 37.8°C) during week 3 of incubation on ADG, ADFI, and feed conversion ratio (FCR) of broilers per week and over the total grow-out period (day 1–40).

Item n1 ADG
 ADFI
 FCR
Week
 Total Week
 Total Week
 Total corr2
1 2 3 4 5 6 1 2 3 4 5 6 1 2 3 4 5 6
EST week 2
 37.8°C 16 22 46 74 96 114a 114 78 24 59 98 146 178 201 117 1.08 1.28 1.33 1.53 1.56 1.77a 1.51 1.51
 38.9°C 16 22 46 76 95 111b 114 77 25 58 99 146 174 194 115 1.10 1.26 1.31 1.53 1.58 1.71b 1.50 1.50
 SEM 0.2 0.5 0.9 0.9 1.5 2.1 0.6 0.2 0.6 1.2 1.4 1.8 2.9 1.0 0.01 0.01 0.01 0.01 0.01 0.02 0.01 0.01
EST week 3
 36.7°C 16 22b 45b 74 94b 111 112 76b 24b 58 96b 145 174 194 115b 1.08b 1.28a 1.30 1.55a 1.57 1.73 1.51 1.51
 37.8°C 16 23a 47a 76 97a 114 116 79a 25a 59 101a 147 178 202 118a 1.10a 1.25b 1.33 1.51b 1.56 1.75 1.51 1.51
 SEM 0.2 0.5 0.9 0.9 1.5 2.1 0.7 0.2 0.6 1.2 1.4 1.8 2.9 1.0 0.01 0.01 0.01 0.01 0.01 0.02 0.01 0.01
EST week 2 x EST week 3
 37.8°C × 36.7°C 8 22 45 73 93 113 113 77 24 58 96 144 175 198 115 1.07 1.29 1.32 1.55 1.55 1.77 1.50 1.50
 37.8°C × 37.8°C 8 23 48 76 99 116 115 79 25 60 101 149 181 203 119 1.10 1.26 1.33 1.51 1.57 1.78 1.51 1.52
 38.9°C × 36.7°C 8 22 46 75 95 109 112 76 24 58 97 146 173 189 114 1.09 1.27 1.29 1.55 1.59 1.69 1.51 1.51
 38.9°C × 37.8°C 8 23 47 77 95 112 117 78 25 59 101 145 175 200 117 1.11 1.24 1.32 1.52 1.56 1.73 1.50 1.50
 SEM 0.3 0.7 1.2 1.2 1.9 2.8 0.9 0.3 0.8 1.7 1.9 2.6 4.1 1.4 0.01 0.01 0.02 0.01 0.02 0.03 0.01 0.01
P-value
 week 2 0.48 0.79 0.21 0.45 0.05 0.79 0.30 0.21 0.34 0.73 0.66 0.15 0.14 0.22 0.12 0.15 0.29 0.65 0.23 0.04 0.52 0.50
 week 3 0.005 0.007 0.10 0.03 0.09 0.21 0.02 <0.001 0.15 0.02 0.34 0.14 0.06 0.04 0.04 0.009 0.20 0.03 0.70 0.44 0.94 0.94
 week 2 × week 3 0.48 0.19 0.55 0.08 0.92 0.62 0.95 0.78 0.42 0.68 0.14 0.38 0.44 0.44 0.80 0.79 0.79 0.65 0.12 0.68 0.12 0.13

a-bLeast squares means within a column and factor lacking a common superscript differ (P ≤ 0.05).

1

Number of pens, each containing 10 broilers, 50:50 sex ratio.

2

FCRcorrected for BW at day 40.