ALLEONI, G. F.

DEMARCHI, J. J. A. A.

FRIGHETO, R. S.

LIMA, M. A.

LOURENÇO, A. J.

MANELLA, M. Q.

PRIMAVESI, O.

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Se~si.~~~ A_: ~~~i_~~.n~_N_u_trit~o_n. . . J- . ..__ . _DAILY METHANE EMISSION AT DIFFERENTSEASONS OF THE YEAR BY NELORE CATTLEIN BRAZIL GRAZING 8rochiorio brizontho 0/.MARANDU. PRELlMINARY RESULTSOEMARCI11 , I. I·A A: MANEllA, M. Q.; LOURENÇO,A I.;AUt:ONl, G. F; FRIGIIETO, R. S.: PRJrvv\WSI,O. ANO LIMA, M. AEVALUATION OF WHEAT BRAN AND ITSUSING IN DAIRY COWS NUTRITIONFor chemical composilion studying of wheal bran. random samplcswere laken from Oour producing faclories in sectional of Iran.Sampleswere received weekly during 6 weeks(for every factory,lhere\Vere dif-ferenl 6 samples).These samples were analyzed for value of OM.Cr.ADF.NDF.CF.EE,Ca,and P by standard methods in laboratory.Statisticalanalysis by random complelly design showed that there were signifl-canl dirrerent in value of CP. ADF.NDF. EE among differentfactories(P<O.O 1).In the next step of experiment, wheat bran with thegrealesl of CP value were select for considering lhe effect of low andhigh levei on performance of dairy cows.Eight multiparous Holsteincows were used for two treatments and periods.Cows were adapted tothe experimental diels for 14 days and enlered to the sampling periodof 7 days.The treatmenlS were: 1)25% wheal bran and 2)40%wheatbran (as a percentage of concenlrate).There were no signilkant differ-ent between the average daily DM and nutrienl intakes. DM,OM andCP digeslibililies were signincantly increased with 40%levcl of whealbran(P<0.05), while NDF and ADF digestibililies were similar in thetwo trealments.Rumen pH, NHJand plasma glucose were not signin-cantly increased by changing the levei of wheat bran.Daily milkproduclion,percentage and daily yield of prolien, fal, lactose, casein,NPN and SNF rnilk were not significantly affected by different diets.MethaneemissionsbyNclore callle grazing 8rachiaria brizanlhawere moni-lored during the winter, spring and summer. The evaluationswere carriedoul in an arca of 48 ha. divided in 16 experimental units, formed by 3paddocks. SixteenNclore steerswith Iiveweight (LW)varying frorn 206 to525kg. 196 lo 538kg and 258 lo 598kg during winter, springand sum-mer, respcctively,were distribuled on the experimentalunits with 10 olheranimais of the normal herdoMethane emissionswere measuredwith thehcxanuoride(SF6) lechniQue.The fordge allowancesand chemical compo-sitionweremadebcfore the measurementswere taken.Meanmelhaneemis-sionswcre 102.3, 138.53 and 220.0g animaVdayand 0.344. 0.408 and0.54 3gikgLW/day in lhe winler, spring and summer respectively.Varialionson melhane production observed among seasonsit's mainly due to forageQuality lhat affects digestibility and consumption, but the LW differencesshouldbc takinginloaccount. Thereareastrongstatisticalevidence(P<0.05)that increasingliveweight therearea highermethaneemissions(CH,winter=34.49 + 0.3139 LW,R2 = 0.9397; CH,spring= 38.10 + 0.3003 LW,R2 = 0.9392; CH,surnrner= 75.08 + 0.342 LW, R2 = 0.79). TIleCH, emissions wcre highly correlated (P<0.05) with animal LW for aliscasons(r= 0.8084,0.9691 and 0.8888, for winter, spring and summer,respcctivcly).Rclativemethaneemissions(CH.gikg LW) were invcrsclycor-related wilh live weight (r= -0.8481, -0.870 I, and -0.6440, forwinter, spring and summer, respeclively).This is bccause of ~, "" .••• '"lhe hii)her dry nlaller intakein relation to the bocIyweight of ~,'" •.•growing animais. " ~'... . ~ STUDY ON THE NUTRIENT BALANCEMONENSIN ON RUMEN *" •••. 4\ ',-\'" TECHNICAL DEVELOPMENT FORFERMENTATION OF NELLORE STEERS I MINIMIZATION OF METABOLlZEDI, DISORDER IN DAIRY COW DURING THE PRE-I AND POSTPARTUMIiIIII!VAUNOTE, AC.; NOGUEIRA FIUIO, 1.C.M.: LEME, P.R.: NOGUEIRA,K.A; CUNIIA, I.A; LACERDA, R_S.; CASTRO. AL. DE ANO SOARES,W.VB.Four cannulated Nellore (805 indicu5 indicuSj steers, were utilized ina 4x4 Ialin sQuaredesign experiment to evaluate the rumen fermenta-tion. Slecrs were fed high concentrate diets wilh calcium salt of faltyacids or whole cottonseed as fat sources, and to study the effect ofmonensin in wholc collonseed diets. Each experimenlal period of sixdays had a previous adaptation period of 16 days. Four concentrates\Vere fed: control (CTRL), wilh caleium salt (CSalt). with whole cotton-seed (CS), and wilh whole cottonseed wilhout monensin (CSWMO).The diets had, respectively, 4,8, 9,4 8,9, and 7,7% of ether exlract inthe dry matter. The fermentation parameters measured were NHJ,volatile fat acids (VFA) and pH. Statislical analysis was made wilh thegeneral linear model (GLM) procedure of SAS. The inclusion ofwholecottonseed or caleium salt as fat source did not affecl lhe rumen pa-rameters studied (p>O,05). The ionophore ulilizalion or not in thewhole cottonseed diets had no effect either. These results suggestedlhat whole cottonseed had Iittle or no effect on rumen fermentationdue 10 the slowly fat reicase and that calcium salt was inert in lherumen environment. It was concluded that whole cottonseed and cal-cium salls are fat sources with Iittle effect on rumen fermentation atlhe levcls ulilized in this experiment, and also that monensin appar-ently has no innuence on rurnen fermentation of diets with whole cot-lonseed.Twenty ll1ulliparous Holslein cows were used to examine lhe effects ofOakecorn and RUP(rumen undegradable protein) levels on dry malterintake, milk yicld, milk composilion and melabolic disorders of dairycow during the prepartum and poslpartum. Two kinds of corn, crack-ing corn and nake corn, and lwo levels 01'RUr. RUP 30% and RUP40% were tested according lo a factorial arrangement in a randoll1izedblock designo Didary treatments were fed 3d /ibilum from 2 1d beforeexpected calving dale to 21 d after calving. Dry matter intake wassimilar 9 kg all10ng treatments for 3weeks prepartum, but postpartumintake was higher for cows fed the Oakecorn and RUP 40% diets.Cows fed lhe nake corn diets produced more rnilk yields than thosefed the crackillg corn diels. Concentrations of NEFA and glucose wereunaffected by treatment, bul cows fed cracking corn and RUP 30%diet increased concentration of NEFA at calving. Calving case wasunafTectedby treatment. At calving. plasma cortisol concenlration washigher for cracking corn and RUP 40% treatment than anlher treat-menls.IX World Conference on Animal Production and XVIII Reuniõo Latinoamericana de Produçõo Animo:, October, 26-31, 2003 - Porto Alegre, Rio Grande do Sul, 8rezil

Daily methane emission at different seasons of the year by Nelore cattle in Brazil grazing Brachiaria brizantha cv. Marandu. Preliminary results.

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