Synovex-S improves the average daily gain and carcass traits of steers and reduces losses under high feed price levels when compared to nonimplanted steers. High energy diets also influence average daily gain (ADG) favorably, but they increase the amount of fat and decrease the protein in carcass soft tissue in comparison to low energy diets

Crouse, John D.

Harrison, Virden L.

Prior, Ronald L.

English

UNL | Libraries

University of Nebraska - Lincoln 
DigitalCommons@University of Nebraska - Lincoln 
Roman L. Hruska U.S. Meat Animal Research 
Center 
U.S. Department of Agriculture: Agricultural 
Research Service, Lincoln, Nebraska 
1982 
Elfazepam and Synovex-S Influences on Growth and Carcass 
Characteristics of Steers Fed Two Dietary Energy Levels 
Ronald L. Prior 
U.S. Meat Animal Research Center 
John D. Crouse 
U.S. Meat Animal Research Center 
Virden L. Harrison 
U.S. Meat Animal Research Center 
Follow this and additional works at: https://digitalcommons.unl.edu/hruskareports 
 Part of the Animal Sciences Commons 
Prior, Ronald L.; Crouse, John D.; and Harrison, Virden L., "Elfazepam and Synovex-S Influences on Growth 
and Carcass Characteristics of Steers Fed Two Dietary Energy Levels" (1982). Roman L. Hruska U.S. Meat 
Animal Research Center. 11. 
https://digitalcommons.unl.edu/hruskareports/11 
This Article is brought to you for free and open access by the U.S. Department of Agriculture: Agricultural Research 
Service, Lincoln, Nebraska at DigitalCommons@University of Nebraska - Lincoln. It has been accepted for inclusion in 
Roman L. Hruska U.S. Meat Animal Research Center by an authorized administrator of DigitalCommons@University 
of Nebraska - Lincoln. 
____u ____.________
ELFAZEPAM AND SYNOVEX-S INFLUENCES ON GROWTH AND CARCASS
CHARACTERISTICS OF STEERS FED TWO DIETARY ENERGY LEVELS
RonaldL.Prlor,1JohnD.Crouse,andVirdenL.Harrison
Summary
Synovex-Simprovestheaverage
dailygainandcarcasstraitsofsteersand
reduceslossesunderhighfj:!edprice
levelswhencomparedtononimplanted
steers.Highenergydietsalsoinfluence
averagedailygain(ADG)favorably,but
theyincreasetheamountoffatandde-
creasetheproteinincarcassofttissuein
comparisontolowenergydiets.
Introduction
Underpresentmarketconditions,the
useofgrowth-promotingimplantsorfeed
additivesthatimprovegainor feedeffi-
ciencycanbe thedifferencebetween
profitandlossin manyfeedingopera-
tions.Synovex-S(200mgofprogester-
oneand20mgofestradiolbenzoate)im-
provesADGandfeedefficiencyinsteers.
Theuseofstimulantsinfeedintake
mayhavedesirableffectsontheper-
formanceofgrowinganimals,particularly
wherevoluntaryintakeisnotadequateto
providesufficientnetenergyfor gain.
Alkyl-sulfonylalkyl-1-substitutedbenzo-
diazepineshavebeenshownto elicit
feedinginsatiatedanimals.Voluntaryin-
takeis of particularconcernin high-
1 RonaldL. Prioris a researchchemistat
MARC.
roughagedietswhereintakeislimitedby
fill.In additionto thefeedingresponse
elicitedby Elfazepam,it hasbeenre-
portedthatadministeringElfazepamto
sheepfedaconstantamountoffeedin-
creasedthedigestibilityofthediet.
Procedure
The objectivesof thisstudywereto
determinethe effect of Elfazepamon
growthand carcass characteristicsof
steersfedrationsoftwoenergydensities
withcornsilageastheforagebaseandto
studypossibleinteractionswithSynovex-
S implants.Corn silage represented
81.7%ofthedrymatterinthelowenergy
dietsand19.7%inthehighenergydiets,
resultingin 5.7 and6.8 Mcalmetaboliz-
ableenergyperpoundforthetwodiets.
Elfazepamwasaddedtothediettopro-
videabout8 mg/head/day.Steerswere
fedto1,1221bpenmeanweights.Adding
Elfazepamto thedietdecreasedrateof
gainofsteersby9%comparedtocontrols
notreceivingElfazepam.
Results
SteersimplantedwithSynovex-S
hada 27%greaterADG,a heavierhot
carcassweiQht,andlesskidneyandpel-
vicfatthanonimplantedsteers'(Table1).
Thetrendtowarda decreasedqualit~
gradefromSynovex-Simplantin the
presentexperimentapproachedstatistic-
al significance.Wenotednosignificant
two-wayinteractionsbetweendietary
energylevel,Synovex-Simplant,or
Elfazepamingrowthorcarcasscomposi-
tiontraits.
Theeffectof Synovex-Simplants
washighlysignificantbothfromabiolog-
icalandaneconomicstandpoint.These
implantsmadethedifferencebetween
profitsandlossesunderthelowfeedprice
level and reduced the losses under the
highfeedpricelevel.AlthoughSynovex-S
resultedin similaryield grades and lower
qualitygrades,thisloweringof steervalue
per220Ibwas offsetbya 27% increase in
ADG. Under the low feed price level,net
returns per steer per day were $0.113
higherforsteers implantedwithSynovex-
S thanfor nonimplantedsteers.
Rationenergylevelsignificantlyinflu-
enced ADG. Steers fed the high energy
diet had more kidney and pelvic fat and
more estimated fat and less protein in
carcass softtissue thansteersfedthe low
energydiet.The othercarcass traitsmea-
suredwere notsignificantlyinfluencedby
dietaryenergylevels.
Table1.-Maln effectsof Elfazepam,Synovex-SImplant,anddietaryenergylevelonsteerperformanceand
carcasstraits1
lIem +
Dietary energy level
low High
Elfazepam Synovex-Simplant
+
Numberofsteers_ _ __ __ __ _ _ _ __ _ 00 00 _ __ __ _ 109 108 107 110 110 107
Initialweight.uu lb ~__765.4 :!: 4.4 762.3:!: 4.4 764.9:!: 4.6 762.7:!: 4.2 765.2:!: 4.4 762.5:!: 4.4
Slaughterweight lb 1119.1 :!: 7.0 1120.0 :!: 7.0 1079.1:!: 27.31160.1 :!: 36.81135.2 :!: 37.01102.0 :!: 27.0
Daysonfeed 00 134.3 :!:24.1 144.8:!: 20.2 139.5:!: 14.7 139.5:!: 14.7 164.5:!: 20.4 115.5:!: 13.1
Overallaveragedailygain_u lb u 2.79:!: 3.04 2.55:!: 2.04 2.35:!: 2.04 2.99:!: 3.04 2.31:!: 2.04 3.04:!: 3.04
Hotcarcassweight u__lb 666.8 :!: 4.8 673.0:!: 4.8 674.0:!: 25.1 692.8:!: 34.8 672.8:!: 4.8 667.3:!: 5.1
Adjustedfatthickness___0000__.in _______ .46:!: .02 .43:!: .02 .44:!: .02 .44:!: .02 .43:!: .02 .46:!: .02
Longissimusarea_000000______.in2______ 12.2:!: .2 11.9:!: .2 12.2:!: .2 11.9:!: .2 12.0:!: .2 12.2:!: .2
KidneyandpelvicfaLu u_% 2.95:!: .08 2.78:!: .08 2.99:!: 3.09 2.74:!: 2.08 2.76:!: 2.08 2.97:!: 3.08
Marbling4 00 00_00_00 00_ 10.57:!: .37 10.76:!: .36 11.18:!: .42 10.16:!: .35 11.10:!: .36 10.24:!: .37
Qualitygrade5___00_00_00___0000 00 9.45:!: .19 9.50':!: .19 9.70:!: .22 9.25:!: .18 9.61:!: .18 9.35:!: .19
Yield grade 0000_ ___ ____ __ __ 00__ __ __ __ 00_ 2.94:!: .10 2.90:!: .10 2.90:!: .12 2.94:!: .10 2.93:!: .10 2.91 :!: .10
Estimated soft tissue composition %
Fat_________________________________
Protein _____________________________
Moisture00____._ 00 __0000__0000 _ _____
35.00:!:
14.30:!:
50.96:!:
3.51 33.81:!: 2.51 33.90:!: .59 34.88:!: .49 33.23:!: 2.50 35.58:!: 3.52
2.14 14.78:!: 3.14 14.73:!: 3.16 14.36:!: 2.13 15.06:!: 3.13 14.03:!: 2.14
.38 51.47:!: .38 50.89:!: .44 51.53:!: .36 51.18:!: .37 51.24:!: .39
'Datapresentedas least-squaresmeans:!:standarderror01themean.Carcassqualityandoomposftiontraftswereadjustedbyanalysisofoovariancetoahotcarcassweightof685.3lb.
2."Meanswithina treatmentwithouta oommonsuperscriptdiffer(P~.05).
"Marblingsoore:slight= 7.8. 9;small= 10,11,12.
Saualitygradesoore:good=7,8,9;choice=10,11,12.
---
33


Elfazepam and Synovex-S Influences on Growth and Carcass Characteristics of Steers Fed Two Dietary Energy Levels

DigitalCommons@University of Nebraska

University of Nebraska - Lincoln DigitalCommons@University of Nebraska - Lincoln Roman L. Hruska U.S. Meat Animal Research Center U.S. Department of Agriculture: Agricultural Research Service, Lincoln, Nebraska 1982 Elfazepam and Synovex-S Influences on Growth and Carcass Characteristics of Steers Fed Two Dietary Energy Levels Ronald L. Prior U.S. Meat Animal Research Center John D. Crouse U.S. Meat Animal Research Center Virden L. Harrison U.S. Meat Animal Research Center Follow this and additional works at: https://digitalcommons.unl.edu/hruskareports  Part of the Animal Sciences Commons Prior, Ronald L.; Crouse, John D.; and Harrison, Virden L., "Elfazepam and Synovex-S Influences on Growth and Carcass Characteristics of Steers Fed Two Dietary Energy Levels" (1982). Roman L. Hruska U.S. Meat Animal Research Center. 11. https://digitalcommons.unl.edu/hruskareports/11 This Article is brought to you for free and open access by the U.S. Department of Agriculture: Agricultural Research Service, Lincoln, Nebraska at DigitalCommons@University of Nebraska - Lincoln. It has been accepted for inclusion in Roman L. Hruska U.S. Meat Animal Research Center by an authorized administrator of DigitalCommons@University of Nebraska - Lincoln. ____u ____.________ELFAZEPAM AND SYNOVEX-S INFLUENCES ON GROWTH AND CARCASSCHARACTERISTICS OF STEERS FED TWO DIETARY ENERGY LEVELSRonaldL.Prlor,1JohnD.Crouse,andVirdenL.HarrisonSummarySynovex-Simprovestheaveragedailygainandcarcasstraitsofsteersandreduceslossesunderhighfj:!edpricelevelswhencomparedtononimplantedsteers.Highenergydietsalsoinfluenceaveragedailygain(ADG)favorably,buttheyincreasetheamountoffatandde-creasetheproteinincarcassofttissueincomparisontolowenergydiets.IntroductionUnderpresentmarketconditions,theuseofgrowth-promotingimplantsorfeedadditivesthatimprovegainor feedeffi-ciencycanbe thedifferencebetweenprofitandlossin manyfeedingopera-tions.Synovex-S(200mgofprogester-oneand20mgofestradiolbenzoate)im-provesADGandfeedefficiencyinsteers.Theuseofstimulantsinfeedintakemayhavedesirableffectsontheper-formanceofgrowinganimals,particularlywherevoluntaryintakeisnotadequatetoprovidesufficientnetenergyfor gain.Alkyl-sulfonylalkyl-1-substitutedbenzo-diazepineshavebeenshownto elicitfeedinginsatiatedanimals.Voluntaryin-takeis of particularconcernin high-1 RonaldL. Prioris a researchchemistatMARC.roughagedietswhereintakeislimitedbyfill.In additionto thefeedingresponseelicitedby Elfazepam,it hasbeenre-portedthatadministeringElfazepamtosheepfedaconstantamountoffeedin-creasedthedigestibilityofthediet.ProcedureThe objectivesof thisstudyweretodeterminethe effect of Elfazepamongrowthand carcass characteristicsofsteersfedrationsoftwoenergydensitieswithcornsilageastheforagebaseandtostudypossibleinteractionswithSynovex-S implants.Corn silage represented81.7%ofthedrymatterinthelowenergydietsand19.7%inthehighenergydiets,resultingin 5.7 and6.8 Mcalmetaboliz-ableenergyperpoundforthetwodiets.Elfazepamwasaddedtothediettopro-videabout8 mg/head/day.Steerswerefedto1,1221bpenmeanweights.AddingElfazepamto thedietdecreasedrateofgainofsteersby9%comparedtocontrolsnotreceivingElfazepam.ResultsSteersimplantedwithSynovex-Shada 27%greaterADG,a heavierhotcarcassweiQht,andlesskidneyandpel-vicfatthanonimplantedsteers'(Table1).Thetrendtowarda decreasedqualit~gradefromSynovex-Simplantin thepresentexperimentapproachedstatistic-al significance.Wenotednosignificanttwo-wayinteractionsbetweendietaryenergylevel,Synovex-Simplant,orElfazepamingrowthorcarcasscomposi-tiontraits.Theeffectof Synovex-Simplantswashighlysignificantbothfromabiolog-icalandaneconomicstandpoint.Theseimplantsmadethedifferencebetweenprofitsandlossesunderthelowfeedpricelevel and reduced the losses under thehighfeedpricelevel.AlthoughSynovex-Sresultedin similaryield grades and lowerqualitygrades,thisloweringof steervalueper220Ibwas offsetbya 27% increase inADG. Under the low feed price level,netreturns per steer per day were $0.113higherforsteers implantedwithSynovex-S thanfor nonimplantedsteers.Rationenergylevelsignificantlyinflu-enced ADG. Steers fed the high energydiet had more kidney and pelvic fat andmore estimated fat and less protein incarcass softtissue thansteersfedthe lowenergydiet.The othercarcass traitsmea-suredwere notsignificantlyinfluencedbydietaryenergylevels.Table1.-Maln effectsof Elfazepam,Synovex-SImplant,anddietaryenergylevelonsteerperformanceandcarcasstraits1lIem +Dietary energy levellow HighElfazepam Synovex-Simplant+Numberofsteers_ _ __ __ __ _ _ _ __ _ 00 00 _ __ __ _ 109 108 107 110 110 107Initialweight.uu lb ~__765.4 :!: 4.4 762.3:!: 4.4 764.9:!: 4.6 762.7:!: 4.2 765.2:!: 4.4 762.5:!: 4.4Slaughterweight lb 1119.1 :!: 7.0 1120.0 :!: 7.0 1079.1:!: 27.31160.1 :!: 36.81135.2 :!: 37.01102.0 :!: 27.0Daysonfeed 00 134.3 :!:24.1 144.8:!: 20.2 139.5:!: 14.7 139.5:!: 14.7 164.5:!: 20.4 115.5:!: 13.1Overallaveragedailygain_u lb u 2.79:!: 3.04 2.55:!: 2.04 2.35:!: 2.04 2.99:!: 3.04 2.31:!: 2.04 3.04:!: 3.04Hotcarcassweight u__lb 666.8 :!: 4.8 673.0:!: 4.8 674.0:!: 25.1 692.8:!: 34.8 672.8:!: 4.8 667.3:!: 5.1Adjustedfatthickness___0000__.in _______ .46:!: .02 .43:!: .02 .44:!: .02 .44:!: .02 .43:!: .02 .46:!: .02Longissimusarea_000000______.in2______ 12.2:!: .2 11.9:!: .2 12.2:!: .2 11.9:!: .2 12.0:!: .2 12.2:!: .2KidneyandpelvicfaLu u_% 2.95:!: .08 2.78:!: .08 2.99:!: 3.09 2.74:!: 2.08 2.76:!: 2.08 2.97:!: 3.08Marbling4 00 00_00_00 00_ 10.57:!: .37 10.76:!: .36 11.18:!: .42 10.16:!: .35 11.10:!: .36 10.24:!: .37Qualitygrade5___00_00_00___0000 00 9.45:!: .19 9.50':!: .19 9.70:!: .22 9.25:!: .18 9.61:!: .18 9.35:!: .19Yield grade 0000_ ___ ____ __ __ 00__ __ __ __ 00_ 2.94:!: .10 2.90:!: .10 2.90:!: .12 2.94:!: .10 2.93:!: .10 2.91 :!: .10Estimated soft tissue composition %Fat_________________________________Protein _____________________________Moisture00____._ 00 __0000__0000 _ _____35.00:!:14.30:!:50.96:!:3.51 33.81:!: 2.51 33.90:!: .59 34.88:!: .49 33.23:!: 2.50 35.58:!: 3.522.14 14.78:!: 3.14 14.73:!: 3.16 14.36:!: 2.13 15.06:!: 3.13 14.03:!: 2.14.38 51.47:!: .38 50.89:!: .44 51.53:!: .36 51.18:!: .37 51.24:!: .39'Datapresentedas least-squaresmeans:!:standarderror01themean.Carcassqualityandoomposftiontraftswereadjustedbyanalysisofoovariancetoahotcarcassweightof685.3lb.2."Meanswithina treatmentwithouta oommonsuperscriptdiffer(P~.05)."Marblingsoore:slight= 7.8. 9;small= 10,11,12.Saualitygradesoore:good=7,8,9;choice=10,11,12.---33

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Elfazepam and Synovex-S Influences on Growth and Carcass Characteristics of Steers Fed Two Dietary Energy Levels

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