Voeten A C, Braunius W W, Orthel F W, van Rijen M A
Gezondheidsdienst voor Dieren in Noord-Brabant, Boxtel, The Netherlands.
Vet Q. 1988 Oct;10(4):256-64. doi: 10.1080/01652176.1988.9694182.
Under experimental conditions, the effects of subclinical Eimeria (E.) acervulina and E. maxima infections on growth and feed conversion in broilers of different ages were analysed. It was concluded that infection with E. acervulina and E. maxima led to a process which was independent of the age at which the birds were infected. The infection adversely affected growth and feed conversion for 2 to 3 weeks, followed by a recovery period of 2 to 3 weeks when compensatory growth took place. From this study it may be concluded that subclinical coccidiosis in the first weeks of life and in the last week of life of broilers does not lead to appreciable damage on growth and feed conversion. Since coccidiosis cannot be avoided in practice, systems in which broilers contact subclinical coccidiosis either in the first weeks of life or in the last week of life should be aimed for. It is suggested that in a coccidiostat programme an efficient anticoccidiosis agent is particularly desirable in the 3rd and 2nd week before slaughter. Examinations performed one week or less before slaughter can hardly be justified, on the grounds that there is a risk of a negative effect on growth an feed conversion due to subclinical coccidiosis.
在实验条件下，分析了亚临床堆型艾美耳球虫和巨型艾美耳球虫感染对不同年龄肉鸡生长和饲料转化率的影响。得出的结论是，感染堆型艾美耳球虫和巨型艾美耳球虫会导致一个与鸡感染时的年龄无关的过程。感染在2至3周内对生长和饲料转化率产生不利影响，随后是2至3周的恢复期，此时会发生补偿性生长。从这项研究可以得出结论，肉鸡生命最初几周和最后一周的亚临床球虫病不会对生长和饲料转化率造成明显损害。由于在实际中无法避免球虫病，因此应致力于建立让肉鸡在生命最初几周或最后一周接触亚临床球虫病的系统。建议在抗球虫药方案中，在屠宰前第3周和第2周尤其需要一种高效的抗球虫药。在屠宰前一周或更短时间进行检测几乎没有道理，因为存在亚临床球虫病对生长和饲料转化率产生负面影响的风险。
