Management systems for pastures and for the grazing animals can be major factors in the amount and efficiency of production. Several nutritive and nonnutritive products have been reported to improve utilization of pasture forages and animal performance. Improvement in rate and efficiency of production can be of considerable economic benefit. The importance becomes greater with increasing costs and livestock production. Lasalocid sodium (Bovatec) is a feed additive shown to improve growth rate and feed efficiency of cattle in the feedlot and on pasture. Two experiments were conducted to test the product when fed at 100, 200 or 300 mg per head daily in a corn supplement to steers grazing predominately bromegrass pasture

Embry, L. B.

Goetz, M. J.

Luther, R. M.

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, 1983 Animal Science Reports1983Lasalocid Supplementation for Grazing SteersL. B. EmbrySouth Dakota State UniversityM. J. GoetzR. M. LutherFollow 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 CitationEmbry, L. B.; Goetz, M. J.; and Luther, R. M., "Lasalocid Supplementation for Grazing Steers" (1983). South Dakota Cattle FeedersField Day Proceedings and Research Reports, 1983. Paper 2.http://openprairie.sdstate.edu/sd_cattlefeed_1983/2LASALOC I D  SUPPLEMENTAT I ON FOR GRAZ I NG STEERS L. B .  Emb ry , M. J .  Go etz an d R .  M. Luther CATTLE FEEDERS DAY Dep artmen t o f  An imal an d R an g e  S cien ces CATTLE 83-1 Lasalocid was fed at O, 1 00 �  2 0 0  an d 3 0 0  mg daily in two g razin g ex p erimen ts -w ith s teers fro m late May to mid-Octo b er for 1 41 an d 1 42 day s .  S ix teen s teers p er treatmen t g roup were used in each ex p erimen t an d fed 2 lb p er h ead daily o f  a corn sup p le­men t with th e tes t lev els of las alocid . Averag e res p o n ses in averag e daily g ain for th e two exp eri­men ts were 1 0 6 ,  1 1 2 an d 1 20 %  o f  con trols for 1 0 0 ,  2 0 0  an d 3 0 0 -mg daily of lasalocid. Th ese results in dicate th e 300 mg level to b e  more effective th an th e low er levels . Grazin g con dition s  durin g th e two ex p erimen ts ap p eared to in dicate more b en efit from th e h ig h er level o f  supp lemen tation with imp rovemen t in availab le forag e. Man ag emen t systems for p as tures an d fo r th e g raz in g an imals can b e  majo r factors in th e amoun t  an d efficien cy o f  p rodu ctio n .  Several n u tritive an d n on n u tritive p ro ducts h ave b een rep orted to imp ro ve u tilization of p as ture forag es an d animal p erfor­man ce. I mp rov emen t in rate an d efficien cy of p ro duction can b e  o f  con s iderab le eco n o mic b en efit. Th e imp o rtan ce b ecomes g reater with i� creas in g costs of crop an d lives tock p roductio n .  Las alo cid sodium < Bo vatec> is a feed additive sh own to improve g rowth rate an d feed efficien cy o f  cattle in th e feedlot an d on p astu re. Two ex p erimen ts were con du cted to test th e p roduct wh en fed at 1 00 ,  2 0 0  o r  3 0 0  mg p er h ead daily in a corn supp lemen t to s teers g razin g p redomin ately b romeg rass p as ture. T h e  p asture u s ed in th e ex p erimen ts h ad b een for s everal y ears with a stan d of ab out 50% alfalfa However, th ere h as b een a reduction in th e amoun t over y ears , an d th e availab le forag e was larg ely durin g th e 2 y ears of th ese ex p eriments . 1 es tab lis h ed in itially . o f  alfalfa b ro meg rass Supplemental treatments ta pasture grazing were as follows: L Corn gt· ain (nanmedicated contr·cJl ) 2ci Co1r·n gr·ain �·Ji th 100 mg lasalocid pe1� hE�ad daily < ._1 u Corn grain �,_i:i. th 200 mg lasalocid per head daily 't. Co1�n gr·ai n l,"Ji th 3<)<) mg l c.�s<al oc id per· head daily The corn grain was ground, mixed with the appropriate level of lasalocid and hand-fed in feed bunks daily at 2 lb per head. Supplements were pelleted for the first experiment but fed as meal in the second. Trace mine�al salt and dicalcium phosphate were offered free access. Well water was provided to each pasture paddock tht-ough on--gt-ound 1 i nes to 11-Jate1�i ng tanks. The pasture area was divided into four strips with each strip subdivided into four paddocks of approximately 4 acres. The rows served as replications with each treatment assigned to one of the paddocks in each row to give uniform distribution over the pasture area. To further minimize pasture differences, the cattle were rotated within rows (replications) following each 4-week weighing. The rotation system was such that the supplemental treatment stayed with the cattle as they were rotated to a new paddock each 4-week period. Grazing was con­tinuous for all paddocks throughout each experiment. Sixty-four Hereford and Hereford crossbred steers were pur­chased for experiment 1. Sixty-four Angus and Angus-Hereford steers were used in experiment 2. Each year the steers were individually identified with ear tags, injected with Clostridium chauvoei-septicum-novyi-sordelli bacterin and given a Warbex pour-on treatment for control of external paras1�es. Insecti­cide-impregnated ear tags were used for control of horn flies. The steers received no growth stimulating implants. Fer each experiment, the steers were allotted into 16 similar groups of 4 steers each on basis of weight and breed group. Assignment to pasture treatments and replications was at random. Period of grazing was from May 28 to October 16 for 141 days in experiment 1. In experiment 2, the grazing period was from May 26 to October 15 for 142 days. Results for weight gain data are shown for each experiment and averaged for the two Ctable 1). Since supplements were fed at a ccnstant level of 2 lb per head daily in all paddocks, feed efficiency for supplement and pasture days would reflect rate of gain and is not presented. 2 TABLE 1. LASALOCID SUPPLEMENTATION FOR BRAZING STEERS b§§�l9f i�i mgL�§Y I tem Con trol 1 00 200 300 ------------------------------------------------------a f\lu mb er 32 32 32 I n itial wt, l b  E:<p . 1 6 42 6 4 1  6 42 E!<p . 2 6 89 6 87 6 89 Avg 6 6 6  6 6 4  6 6 6  F in al wt, l b  E:<p . 1 80 4 83 1 83 8 E}·:p . 2 87 8 86 8 886 Avg 84 1 850 862 Avg d ail y g ain , l b  E:<p . 1 L 1 5  1 .35 1 .  39 E:<p . 2 1 .  3 ·3  1 .2 8  1 . 3 9 Avg 1 . 2 4 1 .  32 1 . 3 9 Percen t o f  con tro l 1 0 6 1 1 2 S ixteen s teers p er treatmen t g roup in eac::h o f  tll'JO e:<p erimen ts: Exp . 1 :  May 28 to Octob er 1 6 , 1 98 1  1 4 1 d ays .  Exp . 2 :  May 2 6  to Octo b er 1 5 , 1 982 1 42 d ays. 32 639 6 88 6 6 4  83 8 909 87 4 1 .  42 1 .5 6  1 .  49 1 20 Th ere was a mis u n d erstan d in g  in th e rotation p roced ures for the s eco n d  mon th of exp erimen t 1 .  As a resu l t , th e cattl e were retu rn ed to th e o rig in al p ad d o ck s ,  b u t  th e sup p l emen t treatmen ts w ere rotated as sch ed u l ed .  Th is res u l ted in th e l evel o f  las al o cid b ein g red uced b y  1 00 mg d ail y for th e 1 00 -, 200- an d 300 -mg treatmen t l evel s and th e cattl e in each con tro l p ad d ock receiv ed th e 300 -mg l ev el for th e s eco n d  mon th o f  th e experimen t. Sin ce th e cattl e were sup p l emen ted p rop erl y for four o f  th e five 4-week p eriod s ,  an y effects from th e s eco n d  p eriod were b e-1 ieved to b e  min imal . A vail ab l e  fo rag e w as sh ort for a majo r p art o f  th e p as tu re season in exp erimen t 1 b ecause of a l ow amo u n t  o f  rain . Th e amount o f  rain d u rin g exp erimen t 2 was ab o ve av erag e an d there w as a surp l us of avail ab l e  forag e for th e four s teers in each p ad dock . A l l p ad d o ck s  w ere cl ip p ed in mid -Aug u s t  d u rin g exp eri­men t 2 at ab out 1 0  in . to remove b romegrass s eed s tal k s . 3 R a t e s  o f  g a i n  s h o w n  i n  t ab l e  1 a p p ear r a t h er t y p i c a l  i n  c omp ar i s o n  t o  p ast s t ud i es o n  t h i s  p as t ure area over a season f rom l a t e  May to m i d -O c t o b er a t  t h i s  l ev e l  of g ra i n su p p l e­men t at i on a n d  f or n on i mp l a n t e d  c a t t l e. Rate o f  g a i n was reduced mar k ed l y  d ur i n g  the l as t  p er i o d f rom arou n d  m i d - S e p t emb er t o  m i d-Oc t o b er. Th i s  o c c urred i n  e x p er i ment 2 w h ere t h er e  was a surp l us o f  f orag e a s  w e l l as i n  e x p er i men t 1 u n d er a more l i m­i t e d  s up p l y  of f orag e. No s u p p l e me n t a l  prot e i n was f ed d ur i n g  t h i s  p er i o d , b u t  i t  l i k e l y  wou l d h a v e  b e e n  b e n ef i c i a l .  T h e  reduc t i on i n  g a i n d ur i ng t h i s l at t er p er i od d i d  n ot ap p ear t o  h ave a ny a p prec i ab l e  e f f ec t  o n  t h e  c omp arat i ve res p on se s  t o  t h e  treatme n t  l ev e l s o f  l asa l ocid. Th e m a i n d i f f eren c e s  i n  a n i ma l  p er f orman c e  b e t w e en t h e  t w o  exp er i men t s  were h i g h er rates o f  g a i �  f or t h e  c on t r o l  a n d  t h e  300-mg l asa l o c i d  group s  i n  e x p er i men t 2 .  T h e  more f avorab l e  p astur e  c o n d i t i on s  w ou l d a p p ear t o  of f er a l og i c a l  e x p l a n at i on f or t h e  b et t er p er-f orma n c e  f or t h e  cotiti� o l  group . O p t i mum l e v e l s o f  prod u c t s  suc h as l asa l o c i d  wh i c h a l t er f ermen t at i on i n  t h e  rumen l i k e l y  i n crease w i t h  i n creas i n g l ev e l s o f  f ee d  i n t a k e . More l i m i t ed a v a i l ab i l i ty o f  f orage i n  e x p er i ­m e n t  1 m i g h t  t h e n  b e  a n  i mp or t a n t  f ac t or i n  t h e  sma l l d i f f er­e n c e s  i n  d egree o f  res p o n s e  to i n creas i n g l ev e l s of l a s a l o c i d  f rom 1 00 t o  300 m g  d a i l y .  A l i b era l s up p l y  o f  f orag e  i n  e x p er i ­men t 2 m i g h t  t h e n  e x p l ain t h e  b e t t er res p on se t o  t h e  300-mg l e ve l of l a s a l o c i d .  Averag e d  f or t h e  t wo ex p er i me n t s, t h ere was an i n crease i n  d a i l y  g a i n w i t h i n crea s i n g  l eve l s o f  l as a l oc i d .  I n  c om p ar i s o n  t o  t h e  c on tro l , t h e  i mprovemen t s  i n  w e i g h t  g a i n were 1 06 ,  1 1 2 a n d  1 20 %  f or t h e  1 00, 200 a n d  300-m g  l ev e l s .  4 

Lasalocid Supplementation for Grazing Steers

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Lasalocid Supplementation for Grazing Steers

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