Comparisons between DES, Synovex and zeranol implants and a nonimplanted control under various conditions of growing and finishing are more limited. The experiment reported here is a continuation of research comparing implants of the three products during feedlot finishing of steers

Embry, L. B.

Gates, R. N.

English

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South Dakota State UniversityOpen PRAIRIE: Open Public Research Access InstitutionalRepository and Information ExchangeSouth Dakota Cattle Feeders Field Day Proceedingsand Research Reports, 1976 Animal Science Reports1976Diethylstilbestrol, Synovex or Zeranol Implants forFinishing SteersL. B. EmbrySouth Dakota State UniversityR. N. GatesFollow this and additional works at: http://openprairie.sdstate.edu/sd_cattlefeed_1976This Report is brought to you for free and open access by the Animal Science Reports at Open PRAIRIE: Open Public Research Access InstitutionalRepository and Information Exchange. It has been accepted for inclusion in South Dakota Cattle Feeders Field Day Proceedings and Research Reports,1976 by an authorized administrator of Open PRAIRIE: Open Public Research Access Institutional Repository and Information Exchange. For moreinformation, please contact michael.biondo@sdstate.edu.Recommended CitationEmbry, L. B. and Gates, R. N., "Diethylstilbestrol, Synovex or Zeranol Implants for Finishing Steers" (1976). South Dakota CattleFeeders Field Day Proceedings and Research Reports, 1976. Paper 6.http://openprairie.sdstate.edu/sd_cattlefeed_1976/6South Dako ta S tate Univers ity Brookings , South Dakota Department of Animal S cien ce Agricultural Experiment Stat ion Diethylst ilbestro l ,  Synovex o r  Zeranol Implants for Fin ishing Steers L. B.  Embry and R. N .  Gates A . S . Serie s  7 6- 1 6  Nume rous experiments during pas t years have shown that performan ce of growing and finishing feedlot steers and he ifers is improved when they are adminis tered die thylstilbes trol (DE S ) , Synovex or zeranol . The improvement has been reported from an early age of the s uckl ing calf throughout growing and finishing by implanting and reimplant ing at appropriate inte rvals . Produc ts availab le to b e  include d in the feed include DES for s teers and hei fers and melengestrol acet ate (MGA) for heifers . This route of adminis tra­tion is an e f fe ctive one for improved weight gains and feed efficiency for these two products . I mprovement in animal performance from thes e  implants and feed addit ives has been reported with numerous types of rations as to levels and sources of energy , protein and other es s en tial nutrients . Howeve r ,  the degree of res ponse may vary with the nutrit ional adequacy of the ration . Comparis ons between DES , Synovex and zeranol implants and a nonimplanted con trol under various conditions of growing and finishing are more limited . The experiment reported here is a continuation of research comparing implants o f  t he th re e  products during feedlot finishing of  s teers . Procedures S teers used in the experiment were fed all- concentrate rat ions or s imi lar rations plus 2 lb . of wheat s traw or 2 lb . of  b romegras s -alfalfa hay . Each type o f  ration was fed with 2 lb . per head daily of  a soybean meal-b ased supp lement ( 1 7% prot ein) o r  a corn-b as ed supplement fortified with adequate levels of minerals , vit amin A ,  vitamin E and chlortetracycline . The three roughage treatments each with or without s upplemen tal protein were offere d t o  four pens of  s ix s teers pe r pen . Wi thin each o f  the s ix dietary tre atmen ts , one pen served as the non­imp lan ted control , one pen of animals was implante d  with 36 mg o f  DES , one with Synovex-S (20 mg estradiol and 200 mg progesterone) and one with 36 mg zeranol . Imp lant treatmen ts were administered at the beginning of the 1 40-day finishing experimen t .  All s teers had re ce ived 36 mg zeranol implants at the beginning o f  a growing experiment about 6 mon ths prior to the s tart of this finishing experiment .  A preliminary period o f  6 weeks was allowed between this experiment and a previous growing experiment in which the ration was corn s ilage with protein s upplemen t . Adapt ation to an all-con cen trate ration was accomplished during this preliminary perio d .  The various diet ary treatment s  were initiated when the cattle were we ighe d and sorted f o r  the experiment . Animals were allot ted to 2 4  pens o f  6 e ach on bas is o f  weight . Feeding was once daily in amoun ts to be nearly consumed by the next feeding . The steers were confined to outs ide , concrete-paved pens wi thout access to shade 2 1  - 2 -or she lter . Wei ghts were taken at 4-week intervals in early morning before fee ding . In addition , initial and final we ights were taken follo wing an over­night s tan d  ( about 1 7  hr. ) witho ut access to fee d an d water . The experiment was terminated after 140 days , animals mar keted and carcass data ob t ained. Res ults There were no apparent interact ions bet ween dietary treatmen ts and imp lant treatments . There fore , res ults for imp lant treatments presented in the tab le are ave rages for s ix replication s  across diet ary tre atments .  Nonimp lan ted steers gained 2 . 80 lb . daily . All implant treatments res ult e d  in fas ter we ight gains . Diffe rences over nonimp lante d controls amounted t o  0 . 15 ,  0 . 2 8 and 0 . 22 lb . dai ly for DES , Synovex-S and zerano l ,  respective ly .  Imp rovements expressed as a percentage over cont rol in the above order amounte d to 5 . 4 ,  10 . 0  an d 7 . 9% .  The differences sho wn for Synovex-S and zeranol over nonimp lanted con trols were s ignificant (P < . 0 5 ), b ut there were no s ignifican t  di fferences bet�een imp lan t treatmen ts . Imp lan t treatmen ts ap peare d to have only small e ffects on fee d intake . There fore , implan t treatments res ult ing in higher rates o f  gain also res ult e d  in improve d fee d  e fficiency . The improvement a s  a percent o f  nonimplanted con tro ls amounted to 6.9, 8.6 an d  5 . 5% ,  respe ctive ly ,  for DES , Synovex-S an d zeranol. All di ffe rences were s ignificant ly (P<. 05)  different from con trols but not bet ween imp lant tre atmen ts . Dif ferences in carcass characteris t ics meas ure d were small.  Implanted cat tle making fas ter rates o f  gain had heavie r  carcasses with a tendency toward larger rib eyes and more fat cove ring . S ummary Imp lan ts o f  36 mg diethylstilbes t rol (DES ) , Synovex-S ( 20 mg estradiol and 200 mg proges terone ) and 36 mg zeranol an d a nonimp lan te d control were compare d  in a finishing experimen t us ing 144 s teers averaging abo ut 680 lb . initially with 6 pens o f  6 e ach per treatment gro up .  All s teers had been imp lan te d with 36 mg o f  zeranol abo ut 6 mon ths prior to the finishing experi­ment .  Rations during the 140-day experimen t  were all-con centrates or s imi lar ones p lus 2 lb . o f  e ither wheat s t raw o r  b romegrass-alfalfa hay . Nonimp lan te d s teers gained 2 . 80 lb . dai ly .  All imp lan t treatments res ulte d  in fas ter rates of gain . Improvements ove r con trols amounted to 5 . 4 ,  10 .0 an d 7 . 9% ,  respective ly ,  for DES , Synovex-S an d zeranol. Implant treat­men ts had only small e ffe cts on fee d intake b ut res ult e d  in improvements in fee d e fficiency o f  6.9, 8.9 and 5 . 5% for DES , Synovex-S an d zeranol ,  respe c­tive ly .  Di fferences in carcass characte ris tics were sma ll. Implanted cat t le making fas ter gains had heavie r carcas s es with a ten dency toward larger rib e yes and more fat covering . 2 2  - 3 -Imp lant Treatmen ts for Finishing Cattle with Hi gh Corn Diets (June 10 to  October 2 3 ,  19 7 5-- 1 40 days ) Number o f  animals Init . shrunk wt . ,  lb . Final shrunk wt . ,  lb . Avg .  daily gain , lb . Avg, dai ly ration , lb . Feed / 100 lb . gain , lb . Hot carcas s wt . ,  lb . Marblingb c Carcass �rade Mat urity Colo re f Firmness Percent kidney fat Rib eye are a ,  sq . in . Fat thi ckness , in . Con trol 36 6 80 10 7 1  2 . 80 2 3 . 39 835 6 64 6 . 3  19 . 9  2 3 . 1 4 . 9  5. 8 2 . 5  1 1 . 16 0 . 6 6  DES 35a 683  109 5 2 . 9 5 2 2 . 9 3 7 7 7  6 79 6 . 2  19 . 7  2 3 . 0 4 . 9  5. 7 2 . 6  1 1 . 16 o. 72 Synovex- S 36 6 7 9  1 1 10 3 . 0 8 2 3 . 50 763  688 5 . 8 19 . 6  2 2 . 8  4 . 7 5. 7 2 . 3  11. 42 0 . 71 Zeranol 36 6 79 110 1  3 . 0 2 2 3 . 8 1  7 89 6 83 6 . 0  19 . 5  2 3 . 0  4 . 7  6 . 0 2 . 3  11. 4 6  0 . 70 aOne loss occurre d  not believe d to  be related to conditions o f  the experi-men t . Res ults presen te d  for this t reatment gro up are for 35 head . bModes t = 6 ,  small = 5. cChoice • 20 , Good= 1 7 . Graded to one-third grade . dz3 = A mat uri ty . eHigher n umber represents darker meat . fHigher n umber represents firmer meat . 2 3  

Diethylstilbestrol, Synovex or Zeranol Implants for Finishing Steers

https://openprairie.sdstate.edu/cgi/viewcontent.cgi?article=1005&amp;context=sd_cattlefeed_1976

Diethylstilbestrol, Synovex or Zeranol Implants for Finishing Steers

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