Page 15 - MWC 10-27-2022s
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for two weeks because the  them quickly when the upper                                    The Midwest Cattleman · October 27, 2022 · P15
      plants  usually  contain  high  portion of plants is grazed off.      ly during the hay drying             Forage legumes such as
      concentrations of prussic acid.       •Generally, forage nitrate      process and the forage  alfalfa and clovers have  an
         •New growth may appear  levels drop significantly 3 to 5           should be safe once baled  increased risk of bloat when
      at the base of the plant after  days  after  sufficient  rainfall,    as dry hay.  The forage can  grazed one or two days after
      a non-killing frost. If this oc- but it is always safer to send       be mowed any time after a  a hard frost. The bloat risk is
      curs, wait for a killing freeze,  in a sample for testing before      frost if you are making hay. It  highest when grazing pure le-
      then wait another 10 to 14  grazing or feeding forage soon            is rare for dry hay to contain  gume stands and least when
      days before grazing the new  after drought stress periods. I          toxic levels of prussic acid.  grazing stands having mostly
      growth.                            have seen where frosts after       However, if the hay was not  grass.
         •Do not allow hungry or  drought ending rains seem to              properly cured and dried be-         The safest management is
      stressed animals to graze  maintain the high nitrate lev-             fore baling, it should be tested  to wait a few days after a kill-
      young growth of species with  els in forages (high nitrates           for prussic acid content before  ing frost before grazing pure
      prussic acid potential. To re- can be maintained all winter           feeding to livestock.             legume stands – wait until
      duce the risk, feed ground ce- in the forage), so don’t assume          Forage with prussic acid  the forage begins to dry from
      real grains to animals before  frosts will reduce the nitrate         potential that is stored as  the frost damage. It is also a
      turning them out to graze.         levels. Keep testing the forage    silage is generally safe to  good  idea  to  make  sure  ani-
         •Use heavy stocking rates  and only graze or feed it when          feed. To be extra cautious,  mals have some dry hay be-
      (4-6 head of cattle/acre) and  and IF the nitrate levels drop         wait 5 to 7 days after a  fore being introduced to lush
      rotational  grazing  to  reduce  to safe levels!                      frost before chopping for  fall pastures that contain sig-
      the risk of animals selective-        •Making hay does  not  re-      silage. If the plants appear to  nificant amounts of legumes.
      ly grazing leaves that can  duce nitrate levels in the for-           be drying down quickly after  You can also swath your le-
      contain high levels of prussic  age, but the hay can be tested        a killing frost, it is safe to en- gume-rich pasture ahead of
      acid.                              and diluted sufficiently with      sile sooner.                      grazing and let animals graze
         •Never graze immature  other feeds to make it safe for               Delay feeding silage for  dry hay in the swath.  Bloat
      growth or short regrowth fol- animals.                                8 weeks after ensiling. If  protectants like poloxalene
      lowing a harvest or grazing (at       •Ensiling forage converts       the forage likely contained  can be fed as blocks or mixed
      any time of the year). Graze  nitrates  to  volatile  nitrous         high levels of cyanide at the  with grain. While this an ex-
      or greenchop sudangrass only  oxides,  or “silo  gases”. These        time of chopping, hazardous  pensive supplement, it does
      after it is 15 to 18 inches tall.  gases are highly toxic to hu-      levels of cyanide might re- work well when animals eat a
      Sorghum-sudangrass should  mans. Safety practices in-                 main, and the silage should  uniform amount each day.
      be 24 to 30 inches tall before  clude removing tarps from a           be analyzed before feeding.
      grazing.                           portion of the silo a day or two                                     C.O.R.N. Newsletter
         •Do not graze wilted plants  before removing the silage  Species That Can Cause
      or plants with young tillers.      from the bunker and wearing  Bloat After Frost
         •Under drought conditions,  respirators designed to filter
      allow animals to graze only  out nitrous oxides.
                                                                                               Nance nce
      the upper one-third to one-        Greenchop                                             Na
      half of the plant or the leaves       Green-chopping will not re-                                                Col. Bill Nance
      of coarse-stemmed forages          duce the level of nitrates and
                                                                                   Auction Service
      if  the  nitrate  levels  in  these   is not likely to greatly reduce        Auction Service
      plant parts is safe. Monitor       the level of prussic acid pres-         
      animals closely and remove         ent. However, green-chopping
                                                frost-damaged plants                                 In God we trust! Philippians 4:13
                                                will lower  the  risk                  “No Matter How Big or Small, We Do Them ALL”
                                                compared with grazing                   Whether you sell a dozen or a hundred head...
                                                directly, because ani-                           Whatever breed you raise...
                                                mals are less likely to                              Wherever you live...
                                                selectively graze dam-
                                                aged tissue. Stems in
                                                the forage dilute the                                                At every event, we deliver
                                                high prussic  acid  con-
                                                tent that can occur in                                              the same excellent service
                                                leaves. However, the                                                that our sellers and buyers
                                                forage can still be toxic,                                             have come to expect
                                                so feed greenchop
                                                with great caution                     Scheduling Cattle Sales for  Fall 2022 & Spring 2023
                                                after a frost. If feeding                                            Upcoming Balancer® Sale
                                                greenchopped       forage         Also Specializing in                  Nov. 5 - B/F Cattle Co.,
                                                of species containing               Farm Auctions                           Butler, MO
                                                cyanogenic glucosides,               Real Estate
                                                feed it within a few                Liquidations
                                                hours of greenchop-
                                                ping, and do not leave
                                                greenchopped forage in
                                                wagons or feedbunks
                                                Hay and Silage
      Green-chopping will not reduce the level of nitrates   Prussic acid con-
      but will lower the risk compared with grazing,   tent in the plant de-
      however, the forage can still be toxic, so feed   creases dramatical-           Sheldon, MO   *   *  417.214.0093
      greenchop with great caution after a frost.
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