Page 21 - Oct12020

HERD IMMUNITY the population needs to be im- The Midwest Cattleman · October 1, 2020 · P21
continued from page 19 mune to stop the spread).
In the livestock business,
says. “Therefore, the goal of the use of vaccinations is two-
herd immunity is the reduc- fold. It is used to protect in-
tion of infection or disease in dividual animals from devel-
the susceptible segment of a oping a disease and/or having
population as a result of im- signs and symptoms of a dis-
munity (through vaccination ease. In addition, it is used to
and/or natural infection) in a reduce the severity and dura-
substantive proportion of the tion of disease and to increase
population.” the amount of exposure re-
The chances of exposure quired to cause infection.
and infection decrease with “When the transmission of
an increasing number of indi- a pathogen does not involve
viduals who are immunized. animal-to-animal transmis-
This results in a decrease in sion such as West Nile virus
the transmission of the patho- in horses, this is a critical in-
TRY ON B/F CATTLE CO.
gen within the group such dividual animal immune re- TRY ON B/F CATTLE CO.
that new infections become sponse,” Stokka says. “When
controlled or extinct. transmission is animal to an- Fit fo
Fit for Fescuer Fescue
The threshold for which we imal, not only is individual
can expect to see herd immu- immunity important, but the Designed to
Designed to Work Work
nity is directly related to the development of group or herd
Made to
contagiousness of the patho- immunity is critical to reduce Made to Last Last
gen (the reproductive num- the spread/shedding of the or-
ber). Using the example of ganism and subsequently the
COVID-19, with a reproduc- number of new infections that
tive number of 2.5, the propor- develop.”
tion of the population needing Not just “a
Not just “adapted” to fescue. dapted” to fescue.
to be immune to halt further NATIVE BRED, BORN and GROWN TIVE BRED, BORN and GROWN
NA
spread would be 0.6 (60% of on FESCUE! FESCUE! Our “NO BULL” NO-Our “NO BULL” NO-
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ex
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inferiorit
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Genes
continued from page 20 500-600 pound steers received Genes work reliably and continually...work reliably and continually...
or they get SCRAPPED
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of cow f
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Heifers weighing 400-500
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Maternal Integrity
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and likely in recent years.
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Nov. 7, 2020 - 1 pm
Br
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Butler
Request catalog online / Call for directions.
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You’ve got to ‘hang around’ in the Lunc
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