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FOCUS ON BULL atively closed herd, this prob- The Midwest Cattleman · October 26, 2023 · P24
continued from page 13 ably isn’t a big concern, but A HAY TEST
if the bulls have had contact continued from page 19 calculated by taking DDM
Clark, who also is a veteri- with neighboring herds or if multiplied by DMI and then
narian, said post-breeding new open cows were added for heat damage. It should dividing by the constant 1.29
season can be a good time to to the herd prior to or during be used in place of crude pro- and communicated as a per-
do an overall health evalua- the breeding season, testing tein. centage in comparison to the
tion. is wise." •Neutral detergent fiber feed value of full bloom alfal-
"Hopefully producers IBC extension cow-calf (NDF) measures the struc- fa, which has a RFV of 100.
have been checking regular- specialist Randie Culbertson tural part of the plant, the •Relative Feed Quality
ly throughout the breeding said focusing on your older plant cell wall. NDF gives (RFQ) is another metric for
season and catching things bull is helpful now. “bulk” or “fill” to the diet. ranking forage quality. It is
like injuries, lameness, pink- “This is also a good time Therefore, lower numbers in- similar to relative feed value
eye, and other diseases," he to evaluate your older bull's dicate higher quality. but is determined from an
said. "There shouldn’t be any performance through last •Acid detergent fiber improved equation for index-
big surprises when bulls are year’s calf crop," she said. (ADF) primarily consists of ing grass forages because it
pulled from the cows.” "Did his calves perform as cellulose, lignin, silica, insol- considers fiber digestibility
Depending on the process- you expected? Will you con- uble crude protein, and ash, in the calculation. The cal-
ing schedule, this may be a sider keeping his daughters which are the least digestible culation for RFQ is the per-
good time to vaccinate and as replacements? And the parts of the plant. Low ADF centage of dry matter intake
treat for parasites, Clark bigger question is, did his is preferred because it indi- (DMI) multiplied by the per-
said. The efficacy of external calves have any calving is- cates a higher energy value. centage of total digestible
parasite control often has sues? •Total digestible nutrients nutrients, the sum of which
waned by the end of breeding “A bull's value is in the per- (TDN) represent the total di- is then divided by the con-
season and bulls may have formance of his calves, and if gestible components of crude stant 1.23.
picked up internal parasites his calves are not performing fiber, protein, fat, and nitro-
while grazing, so it may be the way you would want, it gen-free extract in
beneficial to apply some kind may be time to consider re- the diet.
of antiparasitic treatment. placing that bull,” Culbert- •Relative Feed
Herd biosecurity is anoth- son said. Value (RFV) pre-
er top health priority. dicts the animal
“It may be worthwhile to Iowa State University intake rate and
test for things like trichomo- Iowa Beef Center energy value of
niasis," Clark said. "In a rel- forages according
to the amount of
digestible dry mat-
ter (DDM) and po-
tential dry matter
intake (DMI). It is
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