الفهرس 
General IntroductionOnly 14 pages are availabe for public view
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Abstract
<:;ENEI~AL SUMMAR.Y
’I’nree experIments were conducted at the UnlverSl ty ot MInnesota, USA, between August, 1992, through February, 19~4, to determIne ettects of IncludIng brOIler lItter In the dIets ot beef cattle on some reproductIve and productIve traIts. EXPERIMENT 1
EvaluatIon of broIler lItter tor late gestatIng beet cows
A prelImInary study was conducted wIth 1j Angus cows In late gestatIon, allotted accordIng to breedIng background and weIght to two groups. Cows In the control group were ted urea, corn graIn, oat st raw and pral rl e hay, and those In t.ne treatment group were fed broIler lItter ,WOOd shaVIng DaSe) enSIled at 40% mOIsture. BroIler lItter constlt.ut.ed 11.j~~ ot the total ratIon. AnImals were weIghed at 2-wk Intelvals untIL
calVIng, and were condItIon scored at start ot experIment and ~
before calVIng. BIrth weIghts ot calves and theIr weIghts at
28 d were recorded. Blood sampl es ot cows and cal ves were taken near calVIng.
Results ot chemIcal analyses ot enSIled brOIler lItter and tne other teedstutts showed tnat. crude proteIn, ether extract and ash were hlgner In brOIler llt.ter t2b.3U, 4. /9 and ~b.j4~, respectIvely; than In other teedsturrs. Also~, K, Ca,
Mg, ~e, Na, and Mn were nIgher In DrOller lItter than In t.he
b.12 g/Kg and 401.30 ppm, respectively, in brol.ler ll.tter. Ml.neral concentratl.ons l.n cows’ blood samples showed that only P was hlgher l.n cows ted broller lltter than In control cows l181.20 vs 1/0.81 ppm, respectlvelYJ but K was
Zn were hlgher In calves tram control cows than ln those tram cows ted broller lltter, but Ca and eu were hlgher ln calves rrom cows ted broller llL~~L.
01 QUa urea nl trogen was hlgher In cows ted broll er lltter than In control cows l1J.98 vs 12.08 g/CUJ. Body welghts at 2, 4 and b wk betore cal vlng were hlgher tor
dltterences were not slgnltlcant.
Blood urea nltrogen was Sllghtly hlgher tor calves tram cows fed brOller lltter than tor thOSe rrom control cows. Blrth welghts and welghts at 28-d were hlgher tor calves from control cows than those tram cows red brOller Iltter. EXPERIMENT 2
Broller lltter as a reedstutt ror gestatlng beet cows tram 1.1.t..:t-.9-L1Qll ’·h~()l(qh t..:alY~Ill,l dllg perto]:”man9_e Ql_ tnelr calves
Atter breedlng, 12 Angus cows were allotted to two groups accoralng to breecllng oacKground and welgnt. 1ne control group sllage and supplement and treatment
supplement 2%; those In the treatment group were red Ib.5~ broIler lItter, OL~ ~orH sIlage and 1.5% supplement. Results from TrIal 1 showed that DM dIgestIbIlItIes were SImIlar tor both groups when estImated by total collectIon or aCId detergent lIgnIn ,ADL) technIque. Values were b/.Ul vs 67.69% and b3.69 vs 65.71%, respectIvely. However, dIgestIbILIty was hIgher ,P<.Ol) tor sheep fed corn SIlage tnan tor sheep ted lb.5~ brOIler litter when aCId Insoluble ash ,ALA) was usea to estImate dIgestibIlIty (66.11 vs 57.54%, respectIvely). Cruae proteIn digestlbilltles were higher (P<.05) tor sheep ted corn SIlage than for those fed brOIler lItter When ALA (57.54 vs 54.77%) and ADL ,70.38 vs b4.51t) teChnIques were used, nut lower When measured by total collectIon ,b~.4~ vs b/.b~~) In TrIal 1. Ether extract algestlbllltles were hIgher l~<.Ul) tor sheep fed corn SIlage than for those red brOIler lItter wnen estImatea by ALA (70.14 vs 58.5l:S~) but lower ,P<.Ul) when estImated by ADL (4~.54 vs 59.3~~). However, dIgestIbILIty was hIgher (P<.05) When estImated by total collectIon (14./0 vs 70.03%). In TrIal 2, halt the Sheep were fed 23.5% brOIler lItter, 75% corn SIlage ana L.5~ supplement; the other sheep
ere fed 100% brOIler lItter. CrUde proteIn dIgestIbIlItles were lower (P<.05) for sheep tea 2j.5~ brOIler lItter than ror
I flose tcd 100% bLoller lItter when estImated by eIther total COllectIon or the ALA technique, but were hIgher (P<.05) when
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these results indicated that teedlng broiler litter with corn sll age resul ted in lower crude protein dlgestlblll1:Y, but teedlng only broiler litter resulted in higher crude protein digestibility. Urinary nitrogen excretion increased with each increase ot broiler litter in the ration.
2- Cattle digestion trial.
Ten pregnant Angus cows were usea ~n two trials to
midgestati0n. control cows were ted ~~~ corn silage and L~ supplement, and those in the treatment group were tea bL~ corn Silage, 1b.~~ DLu~ler lltt~L and 1.5% supplement lOM basis).
whell estimated by the AOL technique. However, when ALA was used, digestibility values were higher lP<.05) tor cows ted
corn Silage ttlctH Lv •. I.hoSe :!:. ~ .>.JLoiler litter (48.49 vs
41.22~, respectively). When estimated by ADL, CP digestlbilitles were higher lP<.Ol) tor cows tea corn Slldgc than for those fed 16.5~ broiler litter (71.88 vs 5L.~~~). However, CP digestlbl1ities were lower lP<.Ol) tor cows tea corn Silage When estlmatea Dy ALA tecnnlque l~4.4b vs 45.~L~). Trial L was condUcted during late gestation. COn1:rOl cows were rea corn Silage as in Trial 1, but those tea DrOller litter in ~rlal ~ were rea a higher level ot brOiler litter lLj.~~), IS~ ,_Inn Silage ana 1.5% supplement lOM baSiS). Cows red corn
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broJ.ler lJ.tter. CP digestJ.bJ.lJ.tJ.es were hJ.gher lP<.Ul) tor cows red corn sJ.lage than tor ~hose red 2j.~~ broJ.ler llttel (b3.09 vs 46.29%) when ADL was used, but lower l <.O~) when AlA was used \48.~U vs b3.3b~). ln general cows ted broJ.ler lItter had lower dry matter algestlblll~les than those tea corn sIlage.