02476naa a2200241 a 450000100080000000500110000800800410001902400370006010000160009724501530011326000090026650001260027552014760040165300230187765300170190065300200191765300490193765300310198670000190201770000200203670000210205677301570207710621092021-06-03       2021    bl uuuu     u00u1 u    #d7 a10.1016/j.vprsr.2021.1005882DOI1 aSARAVIA, A.  aEimeria spp. in dairy calves in Uruguay. Identification, dynamics of oocyst excretion and association with the age of calves.h[electronic resource]  c2021  aArticle history: Received 12 February 2020, Revised 19 February 2021, Accepted 12 May 2021, Available online 14 May 2021.  aAbstract: Eimeria bovis, Eimeria zuernii, Eimeria ellipsoidalis, Eimeria auburnensis, Eimeria canadensis and Eimeria alabamensis were identified on different dairy farms in Uruguay. The most prevalent species were E. bovis and E. zuernii, which were mainly found in the feces of calves with diarrhea. The dynamics of oocyst excretion were evaluated via the weekly determination of oocysts per gram (OPG) values in fecal samples from 97 calves over seven months. Three groups of calves were formed according to their age in days: Group 1 (1?20 days old), Group 2 (21?40 days old) and Group 3 (41?65 days old). In Group 1, the median OPG was zero, and the maximum OPG was 1,680. In Group 2, the median OPG was between zero and 8,240, and the maximum OPG was 428,800. In Group 3, the median OPG was between zero and 220, and the maximum OPG was 16,000. For the evaluation of the relationship between OPG and age group, a proportional odds model was built. Two samples from 60 bovines evaluated in Group 2 and in Group 3 were selected. OPG was categorized as negative, moderate (lower than or equal to 4,000) or high (greater than 4,000). Calves of Group 2 (21?40 days old) were significantly (p < 0.001) more affected by eimeriosis than calves of Group 3 (41?65 days old). Considering that diarrhea in calves is a multifactorial disease, eimeriosis should be considered when evaluating the control measures for diarrhea syndrome, particularly in calves of 21?40 days of age.  aBovine coccidiosis  aCalf rearing  aEimeria species  aPLATAFORMA DE INVESTIGACIÓN EN SALUD ANIMAL  aPLATAFORMA DE SALUD ANIMAL1 aMIRABALLES, C.1 aRIET-CORREA, F.1 aCASTRO-JANER, E.  tVeterinary Parasitology: Regional Studies and Reports, 25 July 2021, Volume 25, Article number 100588. Doi: https://doi.org/10.1016/j.vprsr.2021.100588.