INFLUENCE OF PSOROPTES-OVIS ON THE ENERGY-METABOLISM OF HEIFER CALVES

被引:23
作者
COLE, NA [1 ]
GUILLOT, FS [1 ]
机构
[1] USDA ARS, LIVESTOCK INSECTS LAB, KERRVILLE, TX 78028 USA
关键词
D O I
10.1016/0304-4017(87)90014-8
中图分类号
R38 [医学寄生虫学]; Q [生物科学];
学科分类号
07 ; 0710 ; 09 ; 100103 ;
摘要
To determine the effect of Psoroptes ovis on the energy metabolism of heifers, 32 calves were randomly assigned to four treatments in a 2 .times. 2 factorial arrangement. Calves were fed the same diet at two intake levels, high or low, and were either infested or were not infested with P. ovis mites. Calves were housed in antigrooming stanchions. Body composition was determined by urea dilution on Days 0 and 63. Ration digestibility was determined on fecal grab samples using acid-insoluble ash as a marker. Infested calves had developed a severe P. ovis infestation 7 weeks following exposure and had significantly lower daily gain, gain:feed, and energy retention and higher serum glutamic-oxaloacetic transaminase than control calves. P. ovis infestation increased the maintenance energy requirement of calves by > 50% (79 vs. 123 kcal of net energy kg-1 body wt.75). For each 10% increase in the body surface affected by P. ovis, maintenance energy requirement increased 0.5 mcal day-1.
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收藏
页码:285 / 295
页数:11
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