ALENCAR, M. M. de

CAMPOS, L. T.

ESPASANDIN, A. C.

NAYA, H.

URIOSTE, J. I.

RCAAP - Repositório Científico de Acesso Aberto de Portugal

Identification of production environments in Angus populations of Brazil and Uruguay using cluster analysis.

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SEASONAL VARIATIONS AND CORRELATIONSOF ANDROLOGIC PROFILE FROM MATURENELORE BULLS, RAISED UNDER GRAZINGCONDITIONS.Among lhe i q'i IlIdlÜí~ b~!15c:xamineel.a lotal of 42 was sclecleel fora seconel anelrologic evalualion 45 elays IJler. For 57(6,1.0';%) maiurtbulls wilh BS[ S 60 anel 32 (35.96%) wilh BSE < 60. no e1irrerencewas observeel for \Veighl anel CE. evenlhough lhe semen physics anelmorphological aspects were e1irrerent(p < 0.05). showing only a slighllyvarialion in CE. confirmeel by lhe low correialion of BSE parlialpontualion relJleel to CE wilh lhe BSE lotal pontualion. From lhe firsl10 lhe seconel evalualion il was observeel an increase in the CE meanof 0,74 cm (p>0.05) anel e1ifTerences(p<0.05) in ejaculatecJ semenvolume. progressive motility. vigor. lotal spermalic e1efecls. BSE par-lial ponluation relJteel 10 lhe semen physical aspects. anel BSE totalponlualion. Il was regislereel high posilive corrclalion belween ve-siculJr glands and seminal volume (0.33). Ii were also regislereel posi-live correlalion bclween spermalic concenlralion anel semen motility(053) anel vigor (0.45). and negalive between motility (-0.37) anelvigor (-0.36). wilh lolal major dcfects. For malure Nclore bulls lhesemen Quality. even showing seasonal varialions along the year. WaSlhe major characlerislic in ferlility scleclion baseei on BSE. showinglhe great imporlance of semen evalualion when selecting bulls raiseelunder grazing condilions. Keyworels: Anelrologic profile. anelrologiccorrelalions. Nelore bulls. Zebu.IDENTIFICATION OF PRODUCTIONENVIRONMENTS IN ANGUS POPULATIONS OFBRAZIL AND URUGUAY USING CLUSTERANALYSISEsi\'\SANDIN. AC.; URlosn. 1.1.; NAYA. 11.; '::1J:NCAR. M.M. AND("'Vlros L.T.UNESP/laboticabai. SP/Brazii. UDELARlUrllguayEMI3RAPNCPPSE.S;íoCarlos. SP!I3razi!.PROMEI30. RS/l3razil.This work hael the objeclive of ielenlilJing procJuclion environments inAngus becf caUle populalions of Brazil anel Uruguay for subseQuentregional genelic evalualion anel genotype x environmenl inleraclionsludies. Informalion was oblaineel from 87.636 animais born belween1990 anel 200 I. from 120 herels in Brazil anel 24 herds in Uruguay.Clusler analysis was performeel wilh lhe procedure CLUST of SAS.using lhe following variables: weight anel e1ale.al birlh and weaning.pre-weaning daily gain. age at weaning anel age of elam. Ali variablcswere summarizeel by farm. Three c1uslers were ielentified using lhePseuelo-F crilerion. wilh elales of weaning anel birlh anel elaily gainexplJining most of lhe elirrerences belween c1uster groups. Cluster Ijoineel 76 farms wilh ear~' weaning elates (April) anel high preweaninggains (0.77 kglelay). whereas Cluster 2 galhered 51 farms with inter-mediale birlh-weaning perioels (209 days) and pre-weaning elaily gains(0.67 kglelay). /lerels in c1uster 3 (n= 17) showed lhe oldest \Veanedcalves wilh the lowesl gro;\1h (0.53 kglelay) anelyoungesl elams (4.3years olel on average). Bolh countries were represenleel in the c1ustersfounel. 11is conclueled lhal dirrerent production environmenls exist butlhe)' are nol specifically relateel Ia counlry. This resulls suggest lhatstuelies on regional genetic evalualions and/or genotype x envi-". ~. '" .• ~ ronmenl interactions belween I3razil ancJUruguay for lhe~, ••• Angus breeel shoulel consieler elirrerences in proeluction~ environmenl and nol counlries borders.STUDY OF THE LACTATION CURVES,ADJUSTED BY INCOMPLETE GAMMAFUNCTION, FOR CROSSBRED FlHOLSTEIN-GYR COWSI Departamento de Zootecnia da EscolaeleVeterinária. UFMG.2 UniversielaeleEstadualdo Norte r1urnínense.Recorels of 5.368 Iactalion from 66 e1airyfarms in lhe State of MinasGerais were sluelieel. The lactation curves were aeljusleel for calvingse~lson(e1ryand rail»,). for milking managemenl (wilh anelwilhoul cal0anel for milking system (manual anel mechanical). The IJctation curveswere oblained lIsing the Gama Incomplete Funelion (Wooel 1967) asfollolV PL=albexp-et. The paramelers a. b anel e were oblaineel usingPROC NLlN. SAS. The adjusleel milk proeluetions for mulliparous(3919.2kg) cows were 48.9% greater than for primiparous (200 1.4kg).The multiparous anel primiparous cows proeluceel 45% anel 78%. re-speelively. of lhe lolal milk proeluelion up 10 the fourth lJetation monlh.Laclalion starteel in lhe raining season proeluceel 45.8% of tolal milkeluring lhe first lhree monlhs of IJctalion. If lhe grazing season wereabout Minas Gerais is six months. 62% of the milk proeluelion coulelbe proeluceel baseeion pasture. The aeljusteelmilk proeluclion for eowsin mechanical milking system was higher (28.9%) than those in manualmilking. The cows milkeel wilh calves proelueeel 10.6% more milk lhancows wilhout calves. There was no evidenee of an aseeneling phase inlhe lactalion curves. since most of lhe curves showeel negalive b val-ues. Based on lhe low 1\2 values for lhe eQualions in lhis sluely. othermodcls Illusl be lested for beller filling of the lactation curve of FI1-I0Is1ein-G)'r cows.EFFECTOF CORN SILAGE ANDGRAZING STRATEGY ON INGESTIVEBEHAVIOR OF GRAZING DAIRY COWS.SII.BERMI\NN. AV; EUZONDO. F.:MATTIAUDA. D.A. /\NDClIllIBROSTE. P.An experiment was carrieel oul 10 evaluale lhe c1Tecl of lhe maizesilage -grazing session seQuence eluring lhe e1ay. on the ingestive be-havior of grazing dairy cows in early Iactation (35::': 15 e1ays). A dailystrip of pasture (15 kg DM cow-I) was open for each trealmenl be-lween 9 :00 anel 15 :00 hs. The maize silage (16 kg eI-1 per cow. freshbasis) was orrered ai 17:00 (T I). ai 8:00 (12) or eQual1ydislribuleelai 17:00 h and 8:00 h (T3). Grazing anel rUlllination aclivities wererecoreleel eluring lhe whole grazing session eluring lhree conseeutiveelays for lhree weeks. Biling rate (BR) was recoreleel aI lhe beginning(M I). Illielelle (M3) anel enel of the grazing session (M5) lwiee a week.during Ihree weeks. Two main grazing bouls (9 10 10 anel I I to 15 h)were observed for ali lhe lreatmenls. I-Iowever lhe trealmenls elirrereelin lhe probability of fineling a cow grazing eluring the grazing session.12 exhibiteel lhe lowesl probability aI 10 am and 13 lhe highest aI 12anel 13 h. Ruminaling time was significanlly elirrerenl between treat-menls. exhibiling TI the lower value (5%). Trealments eliel not elirrerneilher on erreelive grazing lime nor on mean BR. Bite rale elecreaseeleluring lhe grazingsession (M 1= 50 vS.M3 anelM5 = 30 biles/minute;p<O.OOO I). A signifieanl inleraction between lrealment anel grazingsession was eletecled. In animais uneler reslrieteel grazing eonelilionsthe maize silage - grazing session seQuencc diel not have significanlc1Teelson ingeslive behavior.IX World Conference on Animal Production and XVIII Reunião Latinoamericana de Produção AnimalOctober. 26-31. 2003 - Porto Alegre. Rio Grande do Sul. Brazil

Identification of production environments in Angus populations of Brazil and Uruguay using cluster analysis.

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RCAAP - Repositório Científico de Acesso Aberto de Portugal

Repository Open Access to Scientific Information from Embrapa