NDLI: Follicular Dynamics and Pregnancy Rate in Nellore Heifers Submitted to Fixed-Time Artificial Insemination Protocols (FTAI)

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Follicular Dynamics and Pregnancy Rate in Nellore Heifers Submitted to Fixed-Time Artificial Insemination Protocols (FTAI)

Content Provider	MDPI
Author	Silva, Filipe Prudente da Neves, Kedson Alessandri Lobo Correa, Francisco R. A. Silva, Lílian K. X. Batista, Helder R. Silva, Welligton C. da Caruso, Nohora Mercado Minervino, Antonio Humberto Hamad
Copyright Year	2022
Description	This study aimed to evaluate follicular dynamics and pregnancy rates in Nellore heifers submitted to fixed-time artificial insemination (FTAI) protocols associated with equine chorionic gonadotrophin (eCG) or follicle stimulating hormone (FSH). Nellore heifers (n = 259) were used, divided into two studies. Experiment I evaluated the ovarian follicular dynamics in 64 Nellore heifers submitted to different FTAI protocols (n = 32/group) using either FSH or eCG. In Experiment II, the pregnancy rate was evaluated in 195 heifers submitted to FTAI protocols and divided into two groups: FSH (n = 97) and eCG (n = 98). In Experiment I, the ultrasound examination showed that the maximum diameter of the dominant and preovulatory follicles and the ovulation time were similar between the FSH and eCG groups (p > 0.05). However, the ovulation rate was higher in the eCG group when compared to FSH (p = 0.014). In Experiment II, females that received eCG presented a higher pregnancy rate (58.1%) when compared to FSH (40.2%) (p = 0.012). The use of eCG in the FTAI protocol in Nellore heifers promoted a higher ovulation rate and increased pregnancy rate and may be the most suitable alternative to increase conception rates in animals that are raised in an extensive system under tropical conditions in the Amazon.
Starting Page	377
e-ISSN	23067381
DOI	10.3390/vetsci9080377
Journal	Veterinary sciences
Issue Number	8
Volume Number	9
Language	English
Publisher	MDPI
Publisher Date	2022-07-22
Access Restriction	Open
Subject Keyword	Veterinary sciences Veterinary Sciences Reproductive Biology Bos Indicus Reproductive Efficiency Biotechnology Hormones
Content Type	Text
Resource Type	Article

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