02212nas a2200229   4500008004100000245012000041210006900161260000900230300001400239490000700253520144700260653001101707653001201718653001301730653001101743100002001754700001801774700001701792700001301809700001901822856014101841       1992                        eng d00aEffects of low levels of lice and internal nematodes on weight gain and blood parameters in calves in Central Texas0 aEffects of low levels of lice and internal nematodes on weight g  c1992  a144 - 1490 v853 aThe effects of low levels of both biting and sucking lice, a mixed population of nematodes, and a combination of all these parasites were evaluated in calves held in a barn with no environmental controls in central Texas. Observations at 122 sites on each animal for 16 wk consecutively in 1987 revealed that the largest numbers of all louse species [Haematopinus eurysternus (Nitzsch), Linognathus vituli (L.), and Bovicola bovis (L.)] occurred 3-7 wk after infestation. In 1988 L. vituli populations decreased rapidly after the 3rd wk and B. bovis remained fairly constant for 20 wk consecutively. Average nematode egg counts increased to almost-equal-to 300 eggs per gram of feces in 1987 and almost-equal-to 600 eggs per gram of feces in 1988. The nematodes Ostertagia ostertagia, Haemonchus placei, Oesophagostomum radiatum, Cooperia spp., and Trichostrongylus spp. were present at the end of the study in both years as determined by necropsy. No significant differences in erythrocyte count, mean cell volume, hematocrit, hemoglobin concentration, leukocyte counts, or serum albumin concentration were detected. However, significant increases in total serum protein concentration and serum globulin levels in calves harboring both groups of parasites were observed. Mean weight gain in calves infested with lice and nematodes was 11.4 and 10 kg less than that of uninfested controls during 16 wk in 1987 and 20 wk in 1988, respectively.10aCalves10aInsecta10aNematoda10aWeight1 aDeVaney, J., A.1 aCraig, T., M.1 aRowe, L., D.1 aWade, C.1 aMiller, D., K.  uhttps://phthiraptera.myspecies.info/content/effects-low-levels-lice-and-internal-nematodes-weight-gain-and-blood-parameters-calves-centr