A study was carried out in non-infected hens. These started to break down with M. gallisepticum after 3 months and were monitored for a further 3 months.
| TRIAL 2 |
Stipkovits, L. & Burch, D. (1994) |
| – After MG infection (over 3 months) |
| |
Negative control |
MG vaccinated |
Tiamutin® (tiamulin)
programme |
| No of hens housed (HH) |
4 502 |
4 450 |
4 395 |
| No of eggs produced |
201 913 |
208 330 |
257 370 |
| No of eggs / HH |
44.8 |
46.8 |
58.6 |
| Laying (%) |
49.8 |
52.0 |
65.1 |
| Hatchability (%) |
70.0 |
73.9 |
81.1 |
| Mortality (%) |
2.4 |
2.0 |
1.1 |
| No of chicks / HH |
31.4 |
34.6 |
47.9 |
| Extra chicks / HH |
- |
3.2 (10.2%) |
16.5 (52.5%) |
|
| Trial 2 |
| No. of chicks per month / HH |
 |
The untreated and the vaccinated hens both showed a marked reduction in performance and poor protection by the vaccine.
Tiamutin maintained production in the hens giving an additional 16.5 chicks over infected controls.
| 
