Control of Coccidiosis
The prevention or control of coccidiosis by starting day-old chicks on old built-up litter could have been prophesied years ago. It has long been recognized that chicks exposed to small dosages of coccidia at an early age developed a resistance which gave protection against heavier dosages to which they are often exposed from 4 to 12 weeks of age. Built-up litter has thus proved the most practical and effective means by which this resistance can be established.
As second reason why built-up litter could have been expected to limit coccidiosis is the fact that nearly all, if not all, living organisms including bacteria, protozoa, etc., have their parasites. Old built-up litter would seem to offer a favorable medium and conditions for the functioning of the parasites and enemies of coccidia and perhaps other diseases, too.
The third reason is that a 10 percent solution of ammonia spray is considered effective for killing coccidia. Being unable to withstand such spray, they may likewise be unable to withstand the constant ammoniacal atmosphere in built-up litter.
Either of the probably reasons cited offer a plausible explanation for the surprising results secured during the past three years by the Ohio Station and similar unrecorded results experienced by poultrymen everywhere.
The first experimental evidence with reference to the user of built-up litter as a sanitary procedure was secured by the Ohio Station in 1946 when it was first used in the brooder house. During the three years previous when the floor litter was removed and renewed at frequent intervals, the average mortality of 10 broods, or a total of 18,000 chicks, was 19 percent. During the succeeding three years with the use of built-up litter, the average mortality of 11 broods, or a total of 10,000 chicks, was 7 percent. Seldom did a brood escape an attack of coccidiosis before the use of built-up litter. Afterward there was no noticeable trouble from coccidiosis in 11 consecutive broods started and raised on the same old built-up floor litter. Old built-up litter is floor litter which has been used by two or more previous broods of chicks.