The Estrus Manifestation according to the Follicle Size and the Growth Phase after $PGF_{2{\alpha}}$ Injection in Korean Native Cows

한우에서 $PGF_{2{\alpha}}$ 투여 후 난포 크기 및 발달 과정에 따른 발정 증상의 발현

  • Park, Chul-Ho (College of Veterinary Medicine, Chonnam National University) ;
  • Ryu, Jae-Sun (College of Veterinary Medicine, Chonnam National University) ;
  • Yu, Dae-Jung (Livestock Research Institute, JARES) ;
  • Park, In-Chul (School of Veterinary Medicine, Kangwon National University) ;
  • Kim, Jong-Taek (School of Veterinary Medicine, Kangwon National University) ;
  • Suh, Guk-Hyun (College of Veterinary Medicine, Chonnam National University) ;
  • Oh, Ki-Seok (College of Veterinary Medicine, Chonnam National University) ;
  • Son, Chang-Ho (College of Veterinary Medicine, Chonnam National University)
  • 박철호 (전남대학교 수의과대학) ;
  • 류재선 (전남대학교 수의과대학) ;
  • 유대중 (전라남도 농업기술원 축산연구소) ;
  • 박인철 (강원대학교 수의(학부)대학) ;
  • 김종택 (강원대학교 수의(학부)대학) ;
  • 서국현 (전남대학교 수의과대학) ;
  • 오기석 (전남대학교 수의과대학) ;
  • 손창호 (전남대학교 수의과대학)
  • Received : 2012.08.16
  • Accepted : 2012.08.30
  • Published : 2012.09.30


This study was operated to establish induction using ultrasonography by estimating the relation of follicle size and estrus manifestation. Clinical estrus symptoms were observed 97.4% in cows and 87.5% in heifers when overall 55 cows were induced to estrus in a single dose of $PGF_{2{\alpha}}$ after verifying CL through ultrasonography, which means estrus hours among those 52 cows showing the clinical estrus symptoms were estimated 2.39 days on cows and for 2.37 days on heifers which showed no differences (p>0.05). The estrus manifestation hours according to the follicle size in cows didn't have any significance each other (p>0.05), though estrus hours was 54 hours (the shortest) with follicle size bigger than 10 mm and were made up within 69 hours. The estrus manifestation hours according to the follicle size in heifers didn't have any significance each other (p>0.05) and took around 42 hours (the shortest) with follicle size of 5mm (the smallest) and were made up within 66 hours. Follicles after $PGF_{2{\alpha}}$ injection were ovulated and assigned to many phases as follows; Group 1 (growing phase) - continuously growing into ovulation, Group 2 (growing and static phase) - delaying in growth after the growth of follicles, Group 3 (static and growing phase) - growing after growth delay, Group 4 (regressing and new growing phase) - the follicle is closed and a new follicle grows. In addition, the process of follicle development and estrus hours had no significance each other (p>0.05), though estrus manifestation hours in Group 1 and 2 was relatively short, and in Group 3 and 4 for a relatively long time. In the result of all above, the estrus manifestation hours after $PGF_{2{\alpha}}$ injection has no differences accoring to the follicle size in cows and heifers. Therefore, High pregnancy rate is obtained when practicing artificial insemination within 3 days in estrus or TAI in 72 to 80 hours after adminitrating $PGF_{2{\alpha}}$.


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