OCR Text |
Show Scientists Conclude Calf Parasite Study A study of the parasite infestation of calves on pasture has led C. D. Grinnels and J. L. Moore of North Carolina to three main conclusions: (1) calves under ten months of age should not be turned on pasture; (2) calf pastures should be rotated to reduce the parasite intake; and (3) calf pastures should be grazed part of the time by horses, mules or by mature cattle. Parasite populations build up very rapidly on calf pastures, the investigators inves-tigators found. The increase was most rapid on heavily grazed plots, these showing almost double the parasite population as the lightly grazed plot." Calves under ten months are extremely ex-tremely susceptible to parasite attack. at-tack. Rotating pastures and grazing them with mature animals cuts down the population. Mature cattle have an age immunity. |