Slocombe J O, Valenzuela J, Lake M C
Department of Pathology, Ontario Veterinary College, University of Guelph.
Can J Vet Res. 1987 Oct;51(4):470-4.
The transmission of strongyles among 54 Shetland-cross mature ponies was examined from May 30 to November 22, 1983 when the ponies were on pasture and over the ensuing winter when they were in loose housing. Fecal and pasture herbage samples were taken fortnightly through the pasture season and periodically thereafter. Three foals born and reared on pasture were weaned and removed from pasture, two in early August and one in mid-September, and housed for a period before necropsy. Daily maximum and minimum air temperature and total precipitation were recorded. The mean fecal strongyle egg count was highest in the spring and early summer and lowest over the winter. Few larvae were found on the herbage in late May and their numbers were near zero by the third week in June. Subsequently, the numbers increased, were highest from late August through to mid-October and then declined and were low over the winter. Few strongyles were found in two foals removed earlier in the season, and many in the one later. The transmission of strongyles appeared to occur, therefore, principally from mid-summer to mid-fall.
1983年5月30日至11月22日期间，对54匹设得兰杂交成年矮种马体内圆线虫的传播情况进行了研究，在此期间这些矮种马处于放牧状态，随后的冬季则被圈养。在放牧季节每两周采集一次粪便和牧场草本植物样本，此后定期采集。在牧场上出生并饲养的3匹小马驹在8月初断奶2匹，9月中旬断奶1匹，断奶后离开牧场并在尸检前圈养一段时间。记录了每日的最高气温、最低气温和总降水量。粪便中圆线虫卵的平均计数在春季和初夏最高，冬季最低。5月下旬在草本植物上发现的幼虫很少，到6月的第三周其数量接近零。随后，数量增加，8月下旬至10月中旬最高，然后下降，冬季数量较低。在本季节较早被转移的2匹小马驹体内发现的圆线虫很少，而在较晚被转移的1匹小马驹体内发现的圆线虫很多。因此，圆线虫的传播似乎主要发生在仲夏到中秋期间。
