Show Scientists Conclude Calf Parasite Study A study of the parasite infestation of calves on pasture has led C. C D. D Grinnels and J J. J L. L Moore of North Carolina to three main conclusions 1 calves under ten months of ot age should not be turned on pasture 2 c lf 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 call pastures the investigators investigators investigators found The increase was most rapid 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- ex extremely ex susceptible to parasite at at- tack Rotating pastures and grazing grazin them with mature animals cuts down the population Mature cattle have an age immunity |