It Is Never Too Early To Think About Your Herd Bull
SIMPSON, ILL.
Many producers have been calving since early February. Probably the furthest thought in their mind is the herd bull.
However, the herd bull is often nutritionally forgotten or most
marginalized component of the beef cattle enterprise. This is never
advisable because proper bull management, particularly nutrition, is
vital to ensure the long-term viability of the beef cattle enterprise.
Herd bulls contribute one-half of the genetics to each calf crop.
Without a functional bull that contribution and an adequate calf crop is
not realized. Therefore, proper and adequate nutritional management of
herd bulls as well an annual breeding soundness evaluation before the
breeding season is paramount to a successful breeding season and
economic viability of the beef enterprise.
The conditioning period prior to the breeding season is very
important for both growing and mature bulls. Sale of growing bulls has
been robust in the Midwest, but remember these bulls generally have gone
through the development phase which consisted of high-energy
concentrate based diet. These bulls will need to be transitioned from a
test or development diet to a conditioning or maintenance diet that is
often forage based. Keep in mind that these bulls will be stressed
during the diet transition period.
The transition/conditioning period should be around 60 days. This
time frame should allow a sufficient amount of time for the bulls to
adjust to the new diet. Well conditioned bulls during this time period
will reduce their fat cover and “harden up”. This will also provide thin
bulls with an opportunity to increase their body condition.
At the end of the transitioning period, the herd bull should enter
the breeding season with a body condition score of 5.5 to 6.5 (on a 9
point scale). This body condition score will provide the bull adequate
body reserves to utilize during the breeding season since nutritional
attention to bulls during the breeding season is nearly impossible.
Bulls can easily lose 100-400 lbs of body weight – equivalent to loss
of 1 to 4 units of body condition. The amount of bodyweight and body
condition loss will be influenced by the age of the bull, prior body
condition, length of the breeding season, level of activity experienced
by the bull, and breed type of the bull.
It is advisable to conduct a breeding soundness evaluation (BSE) of
your herd bulls before the breeding season. Very few bulls are “sterile”
and unable to produce any offspring. But, 10 percent to 25 percent of
bulls have reduced fertility or possess physical problems which reduce
their ability to sire calves. The breeding soundness evaluation (BSE) is
a useful tool in identifying these bulls. Eliminating bulls with
physical problems or reduced fertility from the breeding herd will
improve overall reproductive efficiency of the herd.
Producers need to recognize that a BSE does not evaluate a bull’s
breeding drive or ability. The producer should ensure that bulls,
especially new ones, are observed during the breeding process and that
they are interested and able to mount and inseminate females.
Remember that approximately 75 days are required for the bull to
produce semen. Sperm production requires about 60 days and an additional
15 days are required for transport through the system, during which
further sperm maturation occurs. If the BSE is conducted 60 days before
the start of the breeding season, then you have an opportunity to
retest the bull or find a replacement bull.
During the calving season begin to assess your herd bull or newly
purchased bull. Provide the bull with an appropriate
transition/conditioning period and conduct a BSE and assess bull’s
breeding drive or ability to ensure that adequate calf crop is realized.
By assessing the bull’s breeding potential early, you will have ample
opportunity find a replacement, if necessary.∆
DR. TERESA L. STECKLER: Extension Specialist, Animal Systems/Beef, University of Illinois