The objective of this research was to determine the effect on feedlot performance of implanting bulls and steers with Synovex-S, and comparing steers to bulls. Profit or loss upon marketing was also studied. Responses to these treatments in terms of feedlot performance provide information to help determine the most effective method of feeding bulls or steers and revenue in dollars upon sale assists in determining the best management scheme for profit

Bruce, L. B.

Gee, D. H.

Hanson, R.

English

Public Research Access Institutional Repository and Information Exchange

South Dakota State UniversityOpen PRAIRIE: Open Public Research Access InstitutionalRepository and Information ExchangeSouth Dakota Cattle Feeders Field Day Proceedingsand Research Reports, 1983 Animal Science Reports1983The Effect of Synovex-S Implants on FeedlotPerformance of Angus Bulls and Early FeedlorPeriod Castrated Angus BullsL. B. BruceSouth Dakota State UniversityD. H. GeeR. HansonFollow this and additional works at: http://openprairie.sdstate.edu/sd_cattlefeed_1983This 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,1983 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 CitationBruce, L. B.; Gee, D. H.; and Hanson, R., "The Effect of Synovex-S Implants on Feedlot Performance of Angus Bulls and Early FeedlorPeriod Castrated Angus Bulls" (1983). South Dakota Cattle Feeders Field Day Proceedings and Research Reports, 1983. Paper 7.http://openprairie.sdstate.edu/sd_cattlefeed_1983/7C A TT L E  F E E D E R S  D A Y  THE EFFECT O F  SYNOVE X-S I MPLANTS ON FEEDLOT PERFORMANCE OF ANGUS BULLS AND EARLY FEEDLOT PER I OD CASTRATED ANGUS BULLS L .  B .  Br u c e ,  D .  H .  Gee a n d  R .  H a n s o n  D e p a r t m e n t o f  A n i m a l  a n d  R a n g e  Sc i e n c e s C A T T L E  83-- 6  O n e  h u n d r e d  A n g u s b u l l s  wer e r a n d o m l y a l l o c a t ed i n t o  f o u r  t r ea t m e n t  g r o u p s  o f  2 5  h ea d  e ac h .  T w o  o f  t h e s e  g r ou p s  w e r e  i m p l a n t ed w i t h  S Y n ovex - S  C a n d  r e i rn p l a n t ed 1 0 0 d a ys l a t e r > a n d  t h e  t r ea t m e n t  p e r i od o f  1 90 d a ys b e g a n . Th e b u l l s  w e r e f ed a r a t i o n o f  h i g h m o i s t u r e  c o r n  a n d  c o r n  s i l a g e  t h a t p r o v i d e d  a n  e n e r g y  l e v e l  c a p a b l e  o f  s u p p o r t i n g a 2 . 75 l b  aver a g e  d a i l y  g a i n .  On e g r o u p  e a c h  of t h e  u n i m p l a n t ed a n d  i m p l a n t ed b u l l s  was c a s t r a t ed a f t e r  t h e  f i r s t  30 d a ys o f  t h e  f eed l o t t r i a l and t h e n  t h e  t r i a l  c o n t i n u ed f o r a n  ad d i t i o n a l  1 6 0 d a ys . T h e  b e s t  o v e r a l l  a v e r a g e d a i l y  g a i n f or t h e  t r i a l p er i o d w a s  o b t a i n ed b y  t h e  b u l l s  i m p l a n t ed w i t h  S y n o v e x - S  f o l l o w e d  b y  t h e  u n i mp l a n t ed b u l l s . B o t h g r ou p s  o f  b u l l s  w e r e  e qu a l l y  f ee d  e f f i c i en t  a n d  m o r e  ef f i c i e n t  t h an t h e  s t e e r s a s  a g r o u p  a n d  t h e  i m p l an t e d s t e e r s  w e r e  m o r e e f f i c i e n t  t h a n t h e  n o n i m p l a n t ed s t e e r s .  B u l l s ,  i mp l a n t e d or n o t , o u t p e r f or med s t ee r s  i n  b ot h  ave r ag e  d a i l y  g a i n a n d  f ee d  e f f i c i e n c y .  Bu l l s  a n d  s t ee r s  w e r e  m ar k e t e d  a t  s i m i l ar w e i g h t s  a n d  s o l d o n  a c a r c a ss w e i g h t  b a s i s ,  w i t h  b u l l s  b r i n g i n g  $ 8 8  p e r  h u n d r ed ­w e i g h t  a n d  s t e e r s  $ 1 0 7 .  B e c a u s e  o f  p r i c e  d i f f er e n c es , t h e  b e s t  s c h em e  w o u l d b e  t o  f e ed i m p l a n t ed s t e e r s ,  e v e n  t h ou g h  b u l l s  p er f or m  b e t t er i n  t h e  f e ed l o t .  A s  f e e d  a n d o t h er c os t s  o f  f eed l o t o p e r a t i o n s  i n c r ea s e , a n y  m e t h od f or i mp r ov i n g  t h e  p r o f i t - m a k i n g p o t e n t i a l  s h ou l d b e  ex p l or e d . On e t ec h n i q u e  t h a t  i s  c os t  e f f e c t i v e f or i m p r ov i n g  f ee d l o t  a n i m a l  p e r f o r m an c e  i s  i mp l a n t i n g w i t h  g r ow t h  p r om o t a n t s .  A n o t h e r  t e c h n i q u e  f o r i m p r o v i n g  f e ed l ot p e r f o r m a n c e  t h a t  i s  b e c o m i n g  w e l l d o c u m e n t ed i s  t h at o f  f ee d i n g m a l e f eed l o t c at t l e as i n t a c t  m a l es r a t h er t h an as c as t r a t e s . T h e s e  b u l l s  h a v e b e t t e r  f e e d l o t p e r f o r m a n c e  t h an s t e e r s .  L i t t l e i s  k n ow n  t h e  v a r i ou s  c o mb i n a t i on s o f  s t e e r s ,  b u l l s  a n d  i mp l an t s .  Th i s  r e sear c h  was d e s i g n e d  t o  p r o v i d e  some i n s i g h t  i n t o  t h e s e  c om­b i n a t i on s  and t h e i r i mp o r t a n c e  to f eed l o t p e r f o r ma n c e . T h e  o b j ec t i ve of t h i s  r es e a r c h  w a s  t o  d e t er m i n e  t h e  e f f ec t  o n  f eed l o t p er f o r ma n c e  o f  i mp l an t i n g  b u l l s  a n d  s t e e r s w i t h  S y n o v e x - S , a n d  c o m p a r i n g s t e e r s t o  b u l l s . P r o f i t  o r  l os s  u p o n  m a r k et i n g w a s  a l s o  s t ud i e d .  R e s p o n s e s  t o  t h es e  t r ea t me n t s  i n  t e r m s  o f  f ee d l ot p er f o r m a n c e  p r ov i d e  i n f or ma t i on t o  h e l p 27 L d et e r m i n e t h e  most ef f ec t i ve m e t h od of f e ed i n g b u l l s  o r  s t ee r s  a n d  r e v e n u e  i n  d o l l a r s  u p o n  s a l e  a s s i s t s  i n  d e t e r m i n i n g t h e  b e s t  m a n a g e m e n t  s c h eme f or p r of i t .  O n e  h u n d r ed A n g u s  b u l l s  w e r e  p u r c h as e d  i n  S o u t h  Da k o t a  a n d  t r uc k ed t o  t h e  Sou t h e a s t  E x p er i m e n t  a n d  � x � e n s t on Far m i n  Beresf o r d , Sou t h  D a k ot a .  T h e y  w e r e  t h an r a n d om l y a l l o t t ed i n t o  f ou r  t r ea t me n t g r ou p s  o f  2 5  b u l l s  e ac h . T h e  b u l l s  w e r e  w e i g h ed , a v e r a g e  of 6 2 5  l b ,  t wo of t h e  f ou r  g r oup s i m p l a n t e d w i t h  S y n o ve x - S  ( a n d  r e i mp l a n t ed 1 0 0 d a ys l a t e r )  a n d  p l a c ed i n  f eed l o t p en s .  T h e y  wer e i n t r o d u c e d  t o  t h e i r r a t i on ( t ab l e  1 >  o f  c o r n  s i l a g e  a n d  h i g h m o i s t u r e  c o r n  w i t h  a 5 %  soyb e a n  mea l p r o t e i n s up p l eme n t  c on t a i n i n g m o n en s i n a n d  t y l o s i n .  T h e  r a t i o n  p r ov i d ed e n er g y  l e v e l s f o r a ve r a g e  d a i l y  g a i n s of ap p r ox i ma t e l y 2 . 75 l b  p er h e a d  p er d a y . Af t e r  3 0  d a y s , t w o  o f  t h e  f ou r  g r ou p s  C on e  i m p l an t ed an d o n e  n o t ) w e r e  c a s t r a t e d  ma k i n g t h e  f o l l ow i n g  f our g r ou p s :  C A >  n on i mp l a n t ed i n t ac t  b u l l s  < B >  i mp l � n t e d  i n t a c t  b u l l s  C C >  n on i m p l a n t ed s t ee r s  a n d  C D >  i m p l a n t ed s t e er s .  T h e s e  an i ma l s w e r e  t h en f ed f or a n o t h er 1 60 d a ys t o  mar k e t  we i g h t .  T h ey w e r e  s o l d on a c a r c a s s  we i g h t  b a s i s on J u n e  24 , 1 98 2 . TABLE 1 .  PRO X I MATE ANALYS I S  OF AVERAGE FEEDLOT RAT I ON USED AND NET ENERGY FOR GA I N  PER LB OF RAT I ON I t em D r y  mat t e r C r u d e  p r o t e i n  C r u d e  f i b er E t h er e x t r ac t  A s h  ON D R Y  MATTER BAS I S  N i t r o g e n  f r e e  e x t r a c t  Net en er g y  f or g a i n < Me a l / l b )  Per c e n t  r a t i o n 4 4 . 5  1 0 . 0 1 0 . 0 3 . 1 4 . 4 7 2 . 7 F e e d l o t p e r f or m a n c e  d a t a  f or t h e  p er i od wer e ob t a i n e d  b y  m on t h l y  we i g h i n g o f  t h e  i n d i v i d u a l  f ee d l o t  a n i ma l s  a n d d a i l y  w e i g h i n g o f  c o n s u m e d  r a t i on .  C a r c a s s  d a t a  w e r e  c o l l e c t ed u p on s l aug h t e r  a n d  w i l l  b e  r ep or t ed at a l a t e r  d a t e .  Th e b u l l s  i n  t h i s  s t u d y  w e r e  man a g e d  t o g e t h er s p ec i f i c a l l y  t o  m i n i m i z e a g g r e s s i ve b e h a v i or .  W h e n  t h ey wer e r a n d om l y a l l o t t ed t o  t h e  f o u r  t r ea t m e n t g r oup s ,  b u l l s  f r o m  t h e  var i ous g r o u p s  w e r e  n ev e r  a l l ow e d  t o  m i x .  T h i s  p r e ven t s  m u c h  of t h e  u n d es i r ab l e  b e h a v i or of t en e � h i b i t ed b y  f ee d l o t b u l l s . 2 8  F e e d l o t p e r f o r m an c e  d a t a  a n d  a v e r a g e  p r i c e r e c e i v e d  f or 100 l b  of c a r c a s s  w e i g h t  a r e  p r es e n t e d  i n  t a b l e  2 .  I n  g en er a l , b u l l s ,  w h e t h er i mp l a n t ed o r  n o t , o u t p er f or m e d  s t e e r s  i mp l an t e d  o r  n o t  i n  f e ed l o t p e r f o r man c e .  I n  t er ms o f  d o l l ar s  p er h ea d  r e c e i v e d  w h en m ar k e t e d , s t e e r s o u t p e r f o r m e d  b u l l s .  TABLE 2 .  FEEDLOT PERFORMANCE AND CARCASS PR I CE OF BULLS AND STEERS BY TREATMENT < DEC 1 6 ,  1 98 1  J UNE 24 , 1 982 , 1 90 DAYS > Nu mb e r  o f  a n i ma l s I n i t i a l 1, .. rL, l b  F i n a l  �.,t , l b  W e i g h t  g a i n �· 1 b Avg d a i l y  g a i n ,  l b  A vg d a i l y  i n t a k e ,  J. b ,  DMB F e e d / i;1 �::i. i n ,  l b  $ / 100 l b  c a r c a s s  _ _ _ _ _ _  §t§�C§ _ _ _ _ _ _ _ _  _ No i mp l a n t  S y n o v e x - S  2 5  624 107 7  4 �.S:3 2 . 4  17 . 6 7 . 4 107 . 00 :25 6 1 4 1 1. 20 17 . 6 6 . 6 107 . 00 - - - - - - - - �Yll�- - - - - - - ­No i mp l an t  S v n o ve x - S  25 6 1 7  1 1�:A 2 11  / 17 . 6 t:> u 5 88 . 00 646 1 180 5 3 4. 2 .  l3 1 B  .. 6 6 . 5 88 . 00 S y n o v e x -S i mp l a n t ed b u l l s  g a i n e d  s l i g h t l y b e t t er t h an t h e  n on i mp l an t ed b u l l s  b u t  w e r e  s i m i l ar i n  f e e d  e f f i c i en c y . I mp l a n t ed s t e e r s  w e r e  s i g n i f i c an t l y  b et t e r  t h an n o n i m p l a n t ed s t eer s f o r a ve r a g e  d a i l y  g a i n a n d  f eed ef f i c i e n c y .. A s  a g r o up , b u l l s  ( b ot h i mp l a n t ed a n d  n on i mp l a n t e d ) w e r e  b e t t e r  i n  a v e r a g e  d a i l y  g a i n a n d  f ee d  ef f i c i en c y  t h an t h e  s t e er s .  T h e  S y n o ve x - S i mp l a n t ed s t e e r s  h a d  v e r y  s i m i l a r f ee d l o t p e r f o r man c e  d a t a  c om ­p a r e d  t o  t h e  n on i mp l a n t ed b u l l s  an d s l i g h t l y  p oo r e r  f ee d l o t p e r f o r ma n c e s t h an t h e  i m p l a n t e d  b u l l s .  Th e m o s t  d r a m a t i c  d i f f e r e n c e  i n  f eed l o t p er f o r m a n c e  w h e n  c o n s i d e r i n a i n d i v i d u a l  g r ou p s  w a s  b e t we e n  n on i mp l a n t ed s t e e r s a n d  t h e  o t h er t h r e e  g r o u p s .. I n  t e r m s  c f  d o l l ar s  p e r 1 00 l b  c a r c a s s  w e i g h t , s t ee r s  f ar o u t p e r f o r m e d  b u l l s , w i t h  a v e r a g e  s t ee r  p r i c es of $ 107 a n d  a ver a g e  b u l l p r i c e s  o f  588 . A l t h o u g h  a l l b u l l s  i n  t h i s s t u d y  g r ad e d  c h o i c e ,  t h ey s t i l l  b r o u g h t  o n l y  b r e a k e r  b u l l p r i c e s . B u l l s  o u t p er f or m  s t e e r s  i n  t h e  f eed l ot .  W i t h  c er t a i n man ag e m e n t s t ep s ,  b u l l s  c an b e  e a s i l y  h a n d l e d  i n  t h e  f ee d l o t a n d  u n d es i r ab l e  b e h a v i or a l  a s p e c t s  m i n i m i z e d . T h e  f ee d l ot p e r f o r man c e  a d v a n t a g e  d oe s  n o t  o u t we i g h  t h e  d i s a d va n t ag e  i n  p r i c es a t  t h e  m a r k e t . A t  t h e  p r es e n t  t i me b e c a u s e  o f  p r i c e ,  t h e  b es t  r ec om m en d a t i on t h at c a n  b e  m a d e  t o  l i v e s t o c k f ee d e r s  i s  t o  f ee d  i mp l a n t ed s t e e r s .  2 9  

The Effect of Synovex-S Implants on Feedlot Performance of Angus Bulls and Early Feedlor Period Castrated Angus Bulls

https://openprairie.sdstate.edu/cgi/viewcontent.cgi?article=1006&context=sd_cattlefeed_1983

The Effect of Synovex-S Implants on Feedlot Performance of Angus Bulls and Early Feedlor Period Castrated Angus Bulls

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