Table 5 Serum antibody titer of Layer PS(Parents stock) used in the experiment

A farm			B farm			C farm
Age of chickenA	MultinationalELISA kitB	DomesticELISA kitC	Age of chicken	MultinationalELISA kit	DomesticELISA kit	Age of chicken	MultinationalELISA kit	DomesticELISA kit
21 weeks	6865	9073	5 weeks	1158	4463	16 weeks	6845	13713
26 weeks	6546	8780	10 weeks	4350	7411	19 weeks	6600	11745
29 weeks	2623	6901	25 weeks	5013	4196	25 weeks	5367	12314
41 weeks	6977	7307	33 weeks	10366	11476	28 weeks	2538	13564
49 weeks	1,777	6843	38 weeks	8058	11981	40 weeks	6238	11022
54 weeks	9329	12276	42 weeks	8550	12631	48 weeks	9623	11193
58 weeks	8915	14055	52 weeks	8903	13003	53 weeks	8113	12267
67 weeks	8896	14967	55 weeks	4888	13675	57 weeks	10301	14783
71 weeks	7946	15048				66 weeks	8723	13676
						69 weeks	8364	14136
D farm			E farm
Age of chicken	MultinationalELISA kit	DomesticELISA kit	Age of chicken	MultinationalELISA kit	DomesticELISA kit
5 weeks	623	3630	4 weeks	1503	8922
11 weeks	3101	8486	9 weeks	4886	11618
14 weeks	2001	7923	12 weeks	2621	9540
26 weeks	5029	10670
34 weeks	9429	10011
39 weeks	6195	10484
43 weeks	6854	12222
52 weeks	8408	14309
56 weeks	7331	13538