Comparison of follicular development, timing of ovulation and serum progesterone, estradiol and luteinizing hormone concentrations in dairy heifers treated with 4‐ or 5‐day CoSynch + CIDR protocols

• Published in: Veterinary medicine and science Vol. 5; no. 3; pp. 379 - 389
• Main Authors: Fishman‐Holland, Heidi, Stoskute, Agne, Ferrer, Maria S., Veal, Deana, Bittar, Joao H. J., Rollin, Emmanuel, Lourenço, Jeferson, Palomares, Roberto A.
• Format: Journal Article
• Language: English
• Published: England John Wiley & Sons, Inc 01.08.2019; John Wiley and Sons Inc; Wiley
• Subjects: 17β-Estradiol; Animals; Artificial insemination; Cattle; Cattle - physiology; CIDR; Co‐Synch; Dairy heifer; Drug dosages; Estradiol; Estradiol - blood; Estrus Synchronization - methods; Female; Follicles; Gonadotropin-releasing hormone; Insemination, Artificial - methods; Insemination, Artificial - veterinary; Luteinizing hormone; Luteinizing Hormone - blood; Original; Ovarian Follicle - physiology; Ovulation; Ovulation - physiology; Pregnancy; Progesterone; Progesterone - blood; Studies; Ultrasonic imaging; Ultrasound; Veterinary colleges; Veterinary medicine; United States > US; Luteinizing hormone; Co-Synch; Dairy heifer; CIDR; Estradiol; Ovulation

The use of 4‐day CoSynch + Controlled internal drug release (CIDR) + timed artificial insemination (TAI) in dairy heifers has resulted in adequate pregnancy rates compared with the 5‐day CoSynch + CIDR + TAI protocol. The objective of this study was to compare follicular growth, timing of ovulation...