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HERD IMMUNITY dividual immunity, which The Midwest Cattleman · October 1, 2020 · P19
continued from page 13 will protect her fetus from Find the Optimum Genetic Solution
exposure and infection,” says
by an infected mosquito. Carrie Hammer, a professor to fit your needs!
Horses, humans and other in NDSU’s Animal Sciences
mammals are known as dead- Department.
end hosts because they can- The ability of any vaccine
not infect other like species. to provide this level of indi- Seedstock Plus
Preventing the mosquito bite vidual immunity 100% of the
is difficult and thus protec- time is very limited, although Fall Bull & Female Sale
tion through vaccination is research indicates vaccina-
important. The vaccination of tion can result in a high level October 17, 2020 * 12 noon
mosquitoes and wild birds is of protection. Joplin Regional Stockyards,
logistically impossible at this The second goal is to
time; thus, the need exists achieve herd immunity. When Carthage, MO
for an effective vaccine in the the transmission of a disease Selling 150 - 18 month old
horse population. is animal to animal, the num-
The three objectives of vac- ber of animals that are at risk BLACK Gelbvieh,
cination are to: of infection is important. Angus & Balancer bulls &
•Induce protection against Once an animal is infected BLACK heifers!
disease and survives, its immune sys-
•Reduce susceptibility of tem has won the battle and
an individual to infection the virus is eliminated. The
•Reduce infectivity (short- greater the number of sur-
ens time and severity) after vivors, or immune animals,
RED REW
the occurrence of an infection the less likely the virus can RED REWARD ARD
In contrast, some dis- find another susceptible one.
‘Fall Edition’
ease-causing infectious Thus, the herd actually pro- ‘Fall Edition’
agents are transmitted in a tects the remaining animals
Bull & Female Sale
different manner. An exam- that are still susceptible. Bull & Female Sale
ple in cattle populations is Potential pathogens differ November 7, 2020 * 12 noon
the virus known to cause the in their ability to infect sus-
disease bovine virus diarrhea, ceptible animals, and some Wheeler Livestock Auction
or BVD. This disease is mis- can spread faster than others. Osceola, MO
named because it rarely caus- This typically is expressed as Selling 40 RED Gelbvieh, RED Gelbvieh,
Selling 40
es diarrhea, but it may play a the reproductive number. This
Balancer bulls
role in a host of other disease is the typical number of new Balancer bulls
manifestations, such as respi- cases of infection that will be & RED females - registered - registered
& RED females
ratory disease, by compromis- generated from an index case.
&commercial!
ing the immune system of the For example, in the case of the &commercial!
animal, making it more sus- herpes virus 1 (IBR) infection
ceptible to other infections. in cattle, the estimate is that
This virus is spread from in a herd of susceptible ani- • Guaranteed Sight-Unseen Purchases!
animal to animal through mals, seven new animals will Let us help you find the bull to fit your
nose-to-nose contact, and also become exposed and infected
likely through the fecal oral for each individual infection. program and needs!
route. The infection is the Of course, this depends on • Free Trucking on every bull! No fine print!
most harmful when the devel- how close the contact, or social
oping fetus is infected. distance, is between animals. • The best disposition & soundness sort!
Exposure and infection To use a human example, the • Extensive Data & Genomic EPDs!
that occur early in gestation, estimate is that for each case
up to 60 days, may result in of measles, 15 new cases will • All Bulls Are Semen & Trich Tested!
absorption or expelling of the arise. • 100 RFI tested bulls sell in these sales!
fetus. When this occurs later “Although estimates vary
in gestation, from approxi- widely, the growing consen- • Videos of sale bulls on website the week
mately day 60 to 180, abor- sus of the reproductive num- before the sale! www.seedstockplus.com.
tion may result, or the virus ber for COVID-19 appears to
may not be recognized as for- be between two and three,”
eign by the developing fetal says Paul Carson, professor ALL SALES!
immune system. of practice in NDSU’s Depart-
Provided the calf survives ment of Public Health. Bid & Buy at: DVDVAuction
this infection, the calf is born The goal with vaccination
with the virus and will shed or exposure (new cases) is to
(expose others to) the virus have this number less than
for its entire life. This be- one. Call for your catalogs
comes the No. 1 reason this “When this occurs, not
virus is maintained in cattle enough new cases are gen- today!
population. erated to propagate the in- 877-486-1160
The goal of vaccination in fection, and an outbreak will
the case of BVD is two-fold. soon be extinguished,” Carson john@seedstockplus.com
“One is to vaccinate the
cow so that she develops in- continued on page 21