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- W1989704553 abstract "Gastrointestinal parasitism of Zebu crossbred (Z), Hereford (H), and Hereford X Brahman (HB) weaned steer calves was observed from March 1985 to May 1986. Three groups of 60 calves were randomised and in each group the three breeds were equally present. Calves in GI were untreated, in GII were treated strategically and in GIII treated monthly with anthelmintic. The effects of anthelmintic treatments on the growth of cattle were assessed by comparing mean live-weight gain (MLG) responses of treated and untreated calves grazing the same permanent pasture. Worm recovery and egg counts increased from autumn to winter. After abundant July rainfalls, herbage infective larvae (L3) and worm burdens (mainly Ostertagia) reached the highest levels and Z calves presented symptoms of clinical parasitism. After high availability of L3 in spring, L3 and egg counts decreased to the end of the study. From the end of winter until summer a high percent of inhibited Ostertagia EL4 was seen. Blood samples showed reduced serum copper lower levels for GI. MLG responses of Z treated calves were significantly higher during the autumn-spring and summer-autumn periods. MLG responses of treated H calves were significant only during the winter-spring period. For HB calves there were no significant MLG responses during any period. The highest monthly treatment response was observed during winter and early spring. All strategic treatments gave significant MLG responses in spring and late summer. Initial effects of parasitism, from autumn until early spring had the greatest consequences in current and later productivity. For Z calves herbage L3, worm burdens, egg counts and MLG responses were higher than for H and HB calves. The Z breed were significantly heavier (+22.7%) at the end of the experiment in GIII than in GI. Similar trends were recorded, significantly, for H breed (+17.7%) and not statistically significant for HB (+12.7%). Under our temperate conditions it seems that H and HB calves showed greater capacity to resist nematode infection than Z calves." @default.
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- W1989704553 date "1990-02-01" @default.
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- W1989704553 title "Epidemiology, effects and control of nematode infections on Zebu crossbred, Hereford and Hereford×Brahman Calves of Argentina's Western pampas" @default.
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- W1989704553 doi "https://doi.org/10.1016/0304-4017(90)90118-u" @default.
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