Pre-synchronization of ovulation timing and delayed fixed-time artificial insemination increases pregnancy rates when sex-sorted semen is used for insemination of heifers

N Oosthuizen,P L P Fontes,R V Oliveira Filho,C R Dahlen, D M Grieger, J B Hall,S L Lake, C R Looney,V R G Mercadante, B W Neville,G A Perry,J G Powell,L D Prezotto,G E Seidel,R S Walker,R C Cardoso,K G Pohler,G C Lamb

Animal Reproduction Science（2021）

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摘要

•Delaying TAI from 54 to 72 h did not increase PR/AI with sex-sorted semen.•Presynchronization combined with delayed TAI increased PR/AI with sex-sorted semen.•PR/AI in the PRE72-SEX treatment did not differ from the CTRL54-CNV treatment.

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关键词

Beef heifers,Delayed fixed-time artificial insemination,Pre-synchronization,Sexed semen

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