Fixed timed artificial insemination (FTAI) through the progesterone (CIDR) of 1st, 2nd, 3rd and 4th uses in bovine. I. Conception rate related to reproductive category, related to body condition scoring (BCS), related to calf withdrawal and use of eCG

摘要

Thisstudyhadthepurposeofverifyingtheefficiencyoffixedtimedartificialinsemination(FTAI)throughtheprogesteronereleasingdevice(CIDR?Pfizer1.9gP4)of1st,2nd,3rdand4thusesinn=18665Zebufemales(Bostaurusindicus)andn=409crossedZebuxEuropean(BostaurusindicusxBostaurustaurus)breedinatotalofn=19071females.Amongn=19071femalessubjectedtoFTAI,n=10797becamepregnant,representinganoverallconceptionrateof56.5%;theconceptionrateamongnulliparous,primiparouslactating,milkingcowsandopen,was54.0%,48.8%,58.8%and57.6%respectively,whereastheconceptionrateaccordingtobodyconditionscoring(BCS)inascaleof1to5,showedthatfemaleswithnbsp;BCS2.5and4.0hadaconceptionrateof55.8%and61.0%,respectively,differingsignificantly(P=0.0008);theconceptionrateafterthecalfwithdrawalanduseofeCGwere56.7%and55.4%,respectively,whereastheconceptionraterelatedonamountoftimesofCIDRuseswere58.2%,54.5%,55.9%nbsp;and56.3%forthefirst,second,thirdandfouruses,respectively,withstatisticalsignificancenbsp;difference(P0.0002)amongtheresults.ThisstudysuggeststhattheadoptionofFTAIandthere-usesprogesterone(CIDR?Pfizer1.9gP4)isafeasibleandeconomictechnologytobeusedtoincreasebeefproductionsystemactivityinsidethenbsp;adaptationsrequiredamongnbsp;theso-calleddevelopmentsustainableisachieved,actuallyoneofthemainchallengesamongthestrategiesnbsp;aimingtoincreaseBraziliancattleproductivity.