Table 1.
The 7 flocks from the commercial facility, the month and year in which the flock was placed, and the anticoccidial control program that the flock was administered.
| Flock # | Month and year placed | Coccidiosis control products | Inclusion rate of product |
|---|---|---|---|
| 1 | May 2016 | Anticoccidial program 1 (Str: Maxiban, Grw: Coban) | Nicarbazin @ 40 ppm and narasin @ 40 ppm, monensin @ 100 ppm |
| 2 | December 2016 | Anticoccidial program 2 (Str: Coban, Grw: Coban) | Monensin @ 100 ppm, monensin @ 100 ppm |
| 3 | April 2017 (Isolate 1 collected on wk 5) | Anticoccidial program 3 (Str: Coyden, Grw: Monteban) | Clopidol @ 125 ppm, narasin @ 70 ppm |
| 4 | July 2017 | Live vaccine, first vaccinated flock (Immucox III) | Gel-droplet 0.25 mL/chick |
| 5 | September 2017 | Live vaccine, second vaccinated flock (Immucox III) | Gel-droplet 0.25 mL/chick |
| 6 | December 2017 (isolate 2 collected on wk 5) | Anticoccidial program 1 (Str: Maxiban, Grw: Coban) | Nicarbazin @ 40 ppm and narasin @ 40 ppm, monensin @ 100 ppm |
| 7 | February 2018 | Anticoccidial program 3 (Str: Coyden, Grw: Monteban) | Clopidol @ 125 ppm, narasin @ 70 ppm |
Three different shuttle programs were used. Up to 2 anticoccidial products were given during the life of the flock, and these were often shuttled during the switch from the starter feed (Str) to the grower feed (Grw) around 18 d of age. Flocks 4 and 5 are the “seeding” event. Oocyst isolates collected at the end of flock 3 were maintained and labeled as the “before seeding” isolate (isolate 1) and oocysts collected at the end of flock 6 were maintained and labeled as the “after seeding” isolate (isolate 2). Isolates 1 and 2 were subjected to 2 anticoccidial sensitivity tests.