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 L. 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 call pastures should be grazed part of the time by horses mules or by mature cattle Parasite populations build up very rapidly on call calf pastures the investigators investigators investigators 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 extremely extremely ex ex- ex- ex susceptible to parasite at at- tack Rotating pastures and grazing them with mature animals cuts down the population Mature cattle have an age immunity |