Bull Selection and Obtaining Historical Benchmarks

In life, knowing your goal determines your route to achieve that goal.

The same is true when selecting bulls for your herd. The first step in smart
bull selection begins with a historical understanding of the bulls. A review of
the last two or three calf crops provides the basis for an account of calves
marketed. Either a simple or detailed review, based on the individual producer’s
desire, is a practical approach that helps with bull selection. Only add the
details you actually are going to review, understand and use.

Were you happy with the calves? If the answer is yes, open the door to better
understand the genetics that produced those calves, which is available by better
understanding the sires of the calves. While the cows are important, today I
want to focus on the sires. With the registration numbers in hand, the data are
accessible through the breed associations.

The Dickinson Research Extension Center utilizes several breeds of cattle. For
this discussion (which is the same for all breeds), I’ll use the Red Angus
bulls. The registration numbers of the center’s Red Angus sires are 1700517,
1700534, 1700525, 1617805, 1617778, 1724745, 1724751, 1724651, 1691764, 1717588,
3473741, 3473800 and 3473777.

So, where are registration numbers? While individual animal identification is
not used throughout the cattle industry, registration numbers are available
throughout the purebred business. Those numbers, the individual registration
numbers of cattle, are critical and are the heart of the breed association.

Did you know that for some breeds, you simply can start registering cattle? By
doing so, a producer starts to build a genetic database. But you do not need to
start from scratch because the herd bulls already should be registered with the
appropriate breed association.

Am I being overly enthusiastic? No, because those genetics are accessed through
the registration numbers of cattle that are registered in the various breed
associations. At recent bull-buying workshops for individual producers,
producers were asked to develop baseline or benchmark values for production
traits of previous bulls utilized in the herd.

Too often, the stumbling block is the lack of a registration number limiting
access to the database that contains the bull’s information. When buying
registered bulls, always, always, always, always insist on transferring the
registration number to your operation. If the bull or bulls are from registered
parents, always insist the bull be registered and transferred to you. Do not
say, “Well, the bull only will be used on commercial cows, so I do not need the
bull registered.” That is wrong, wrong and wrong.

Sorry for the rant. Getting back on track, the center’s 13 Red Angus bulls can
be looked up, utilizing the Red Angus Breed Association website
(http://redangus.org/).

For example, bull 1691764, born March 31, 2014, was purchased as a yearling
based on the growth potential demonstrated by the bull’s expected progeny
differences (EPDs). Bull 1691764’s EPDs for the six major traits the center
tracks are as follows: birth weight, 1.8 pounds; weaning weight, 75 pounds;
yearling weight, 117 pounds; milk, 26 pounds; marbling score, .69; and rib-eye
area, .54 square inch.

Bull 1691764 is a growth and carcass bull. The Red Angus Association also
provides the Herd Builder and Grid Master indexes. Bull 1691764 has a Herd
Builder Index of 101 and Grid Master Index of 51. These indexes will be
discussed in a future BeefTalk.

While other individual traits are available, let’s keep it simple and focus on
the six individual traits already mentioned. Bull 1691764 is just one of the pen
of 13 bulls, so let’s assume all the 13 bulls had an equal opportunity to mate
with the cows.

An average of the values of all the bulls’ EPDs provides a better genetic
benchmark for the center. In this case, the 13 bulls were averaged, and the
average value for each EPD trait is as follows: birth weight at minus 1.7
pounds, weaning weight at 61 pounds, yearling weight at 94 pounds, milk at 20
pounds, marbling score at .52 and rib-eye area at .32 square inch.

Assuming you like the calves you have, then you also know the average EPD values
that produced those calves. Now, as a producer, you have a benchmark to start
the selection of new bulls.

Remember the pen of calves? What do you like? What don’t you like? Select the
bulls that will bend the averages in the direction of the desired change. When
bull selection is based on the herd’s historic numbers that make up the herd’s
genetic benchmarks, progress is made in the long term.

As individual bulls are purchased, each bull’s EPD values should maintain the
average benchmark genetic values or change in a direction the producer wants to
go. Knowing the herd’s genetic benchmarks is critical.

May you find all your ear tags.

For more information, contact your local NDSU Extension Service agent
(https://www.ag.ndsu.edu/extension/directory) or Ringwall at the Dickinson
Research Extension Center, 1041 State Ave., Dickinson, ND 58601; 701-456-1103;
or kris.ringwall@ndsu.edu.

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