In four feeding trials with beef steers, corn silage (CS), alfalfa hay (AH), and alfalfa silage (AS) were compared as roughage sources in dry-rolled (DRC); dry whole (DWC); ground, high-moisture (GHMC); and whole, high-moisture corn (WHMC) fattening diets. In processed corn diets (DRC and GHMC), steers fed CS had lower DMI (P less than .05) and feed:gain ratios (P less than .10) than steers fed AS as the roughage source. In a separate trial, greater gains (P less than .10) and lower feed:gain ratios (P less than .05) were found during the initial feeding period, which included the adaptation phase, for steers fed CS vs steers fed AH as the roughage source. Over the entire feeding period, lower (corn type x roughage source interaction, P less than .05) feed:gain ratios were found in GHMC diets when CS was fed as the roughage source; feed:gain ratios were similar in steers fed DRC diets containing either CS or AH. Over the entire feeding period, similar performance was found among steers fed the various roughage sources in DWC diets; however, with WHMC diets, steers fed AS as the roughage source had lower feed:gain ratios than did steers fed AH (P less than .05) or CS (P greater than .10). In the processed corn diets, high correlations were found between diet NDF digestibility and gain (r = .80), intake (r = .68), and feed:gain ratios (r = -.66); similar trends were found in WHMC diets but not in DWC diets. These results suggest that the ideal roughage source to complement finishing diets may depend on corn processing method and feeding period (adaptation vs finishing).
Arch. T1erern;ihrung Bd. 3: : 108'2 . If. 0 -S. 100-117 -Berlin Fonchungazentruni fiir Tierproduklion DunimerJtocf-Rostoc); der Akademie der ~n d a i r t s r l u f l s~~i~~e n~r h a f t e n der I>DR, Bereicli Tiererdhrung Harnstoff als IConscrvierungsniittel bei cler Lagerung feucliter Futterstoffe 4. JIitleiliing \'erfiit t eriing roii linrnstoffkonserricrt eni Fcuclitgetreide an JIas tschwine 1. Einleitang Untcrsucliungen zur Venwndung von Hariistoff als Konservicrungsniit tel fiir feiiclites Futtergetrcide iind iiii Zusaninienhang damit diircligefiilirtc erste crfolgrcrsprcchende Biitterungs~crs~iclic iiiit Jlastrindern und 3Iastsclimeinen (SCIIJIIDTU. a., i g i s , I. aritt,.) waren der AnlnR fiir-weitere Tierversuche a11111 Einsatz vdn liariistoffkonservicrtei~i Feuchtgetrcide. XTochdeni die neucren Ergcbnissc xiir Verfiitteriing an Mnstrinder in dcr vorhergehcnden Xit teiliing (ScrrmnT 11. a., 1982) dargestclk worden sind, fofgen jctzt weitere ICrgebnisse iibcr die Verfiittcrung an SIastsch-\\.cine.Ob\r.olil niit Hnrnstoff konservicrtes Getrcide ziir X'utziing des SIW-Gchaltcs in erster Linie ail \TTiedcrkliner vcrfiittert' werdcn solltc, Irann die Xotwcndigkeit ziiiii Einsatz bci 3Ionogastriden niclit niisgeschlosscn wcrden. Dabci ergibt. sicli die Fragc, ob iind inwieweit sich rlcr Hnrnstoffaiisatz negativ niif die Fotternnfnnhiiie, del! Gesundhcitsznstand iind dic Leistnng dcr Tierc n.iiswirken knnn. \Yegcn mijglichcr Aiiuiioninkintosil;,?tionen sind die l'orbchnltc gegcn die Verfiitternng liarnstoffhnltigcr Futtemtittel n.n Xichtwiederkkiier nllgenicin sclir gro13.Andcrerseits \r.iirdcn in dcr Pergnngcnlicit eine Rcihe ron Ycrsuchcn mr Ycriiit terung von Hnrnstoff an Jlastschwcine durcligefiihrt., niit dem Xicl, den Harnstoffstickstoff aucli 1)cini Schwein fiir die I~alitcrienprotcins~nthcsc in1 Vcrdauiingstrakt' zii nutzcn (z. l.3. KORXEGAY ii.a., 1970, zit.. bei f3oc1; 11. a., 1076). 1111 R d i n -i c~ dieser l'crs~~clic wirden Rationcn rerfiittert, die bis zii 30/,, Harnstoff enthielten. ifTenn auch inawischcn festzustclien scheint, dafi Xl'X-Verbindiingen fiir die Protcinversorgung der Schweine prditiscli lieine lZollc spielen (BOCK 11. a., IWG), so haben diese Versuche jedocli gezeigt, da13 Hnrnstoff bis Zii eineiii bcstiiiiiiiten Anteil in der Ration iind unter bcstiiiiniten Bcdingiingen von Schweinen toleriert wird. Bocir 11. a. (1070) verwejsen aiif Erfahrungen, nach' dcmn ,,ein Einsntz von Xl'L\'-Verbindiingen bci iiionogastrischen Ticren iiur dann ohne n e p t i r c Folgcn blciht, wenn die Rationen niclit mchr XIS 1 ,50,,'o Hnrnstoff entliallen iind ani3erdein dcr Gclialt der Rationen ail den esscntiellen Atninostiurcn dem, Bcdarf dcr Ticre ent spriclit,". Allcrdings stcllteii die dritoren bci eigencn Vcrsiiclien init Sch\winen fest? da13 hcreits bci O,S*!,, Hnrnstoff in der Ration die Tcndenz eincs crh6htcn Ftittcraiifwancies iind einer rerringerten S-Bilanz corlianden war. I n der rorlicgendcn Arbeit u-ircl niii Bcispiel ciner iiiit. 20/, Hnrnstoff konserrierten E%uclitSetreidkpartic gepriif...
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