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. 2020 Mar 18;99(6):3030–3037. doi: 10.1016/j.psj.2020.01.016

Table 1.

Effects of diet and challenge treatments on layer pullet BW and relative select organ (ovary, bursa, and ceca) weights at 12 wk of age.

Treatments BW1 (g) Ovary2 (%) Bursa2 (%) Ceca2 (%)
Diet
 Control 1,000.3b ± 7.15 0.046 ± 0.0021 0.394 ± 0.0106 0.499 ± 0.0220
 XPC 1,026.0a ± 7.10 0.046 ± 0.0021 0.397 ± 0.0106 0.535 ± 0.0220
Main effect P-value 0.0038 0.8274 0.8489 0.1204
Challenge
 Nonchallenged 1,014.6 ± 7.10 0.045b ± 0.0021 0.420a ± 0.0106 0.483b ± 0.0220
 Rlow MG-challenged 1,011.6 ± 7.15 0.048a ± 0.0021 0.371b ± 0.0105 0.551a ± 0.0220
Main effect P-value 0.7116 0.0385 0.0014 0.0046
Diet-challenge
 Control and Nonchallenged 997.8 ± 9.11 0.045 ± 0.0023 0.424 ± 0.0150 0.480 ± 0.0270
 Control and Rlow MG-challenged 1,002.7 ± 9.26 0.047 ± 0.0023 0.364 ± 0.0148 0.519 ± 0.0270
 XPC and Nonchallenged 1,031.4 ± 9.11 0.044 ± 0.0023 0.415 ± 0.0150 0.486 ± 0.0270
 XPC and Rlow MG-challenged 1,020.5 ± 9.11 0.048 ± 0.0023 0.378 ± 0.0148 0.583 ± 0.0270
Interaction P-value 0.3407 0.3858 0.4562 0.2031

a,bMeans in a column within type of variable and main effect or interaction treatment with no common superscript differ significantly (P ≤ 0.05).

Bold indicates P < 0.05.

Abbreviations: Rlow MG, low passage R strain of Mycoplasma gallisepticum; XPC, original XPC.

1

Nine birds in each of 16 replicate units were used to calculate means in the diet and challenge treatment groups, and 9 birds in each of 8 replicate units were used to calculate means in the diet-challenge treatment combination groups.

2

Four birds in each of 16 replicate units were used to calculate means in the diet and challenge treatment groups, and 4 birds in each of 8 replicate units were used to calculate means in the diet-challenge treatment combination groups.