White muscle disease or muscular dystrophy of sheep is a selenium
responsive malady common to many areas with an inherent natural
deficiency of selenium in the forage. The disease can be prevented in
lambs by adding trace amounts (approximately 0.1 ppm) of selenium to
the otherwise selenium deficient, forage fed...
Ten helminth-free sheep were given two doses of 10,000,
X-irradiated, H. contortus, third stage larvae 30 days apart. These
animals and a group of ten non-vaccinated sheep were challenged
with 50,000, normal, H. contortus, third stage larvae 60 days
following the second vaccination. Antibody levels were measured
in both groups...
Twenty yearling sheep were allotted to four groups, each containing
five sheep of approximately equal weight. On experimental
days 0, 1, 2, 3, and 4, each sheep in each group was given the following
inoculations by stomach tube: five sheep in group I (Fasciola
hepatica-exposed controls) were given approximately 120...
The epidemiology of nematode infections in ewes and lambs on
irrigated pastures was investigated during one reproductive cycle
in a commercial operation in Central Oregon. Primary objectives
were to determine the sources of parasitism, the effect on lamb
weight gains, and the effectiveness of control procedures in minimizing
the detrimental...
Endophytic fungi (A. coenophialum and A. lolii) which infect grasses produce ergot alkaloids that serve as the grasses' chemical defenses and enhance the vigor of the grass. Turf-type tall fescue with high endophyte levels has been deliberately developed to produce a greener, more vigorous, pest-resistant turf. Consumption of endophyte-infected grass...
The digestion responses and degradation of ergovaline and production of
lysergic acid in the rumen of sheep offered Neotyphodium coenophialum-infected
tall fescue straw at two ergovaline levels was investigated. Six crossbred wethers
(56 +1- 3 kg BW) were randomly assigned to one of two treatment groups in a
cross-over design....
Published March 1939. Facts and recommendations in this publication may no longer be valid. Please look for up-to-date information in the OSU Extension Catalog: http://extension.oregonstate.edu/catalog