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OJVRTM
Online Journal of
Veterinary Research©
Volume 20(2):94-103, 2016.
Effect of
gonadotropin-releasing hormone analogue on pregnancy rate in Holstein cows
given at different times relative to artificial insemination.
Mojtaba Goli1*, Hessam Jamshidi1, Ali Mohammadi2
1 Faculty
of Veterinary Medicine, Razi University; 2 Faculty of Veterinary Medicine, Sanandaj
Branch Azad University, Sanandaj, Iran.
ABSTRACT
Goli M, Jamshidi
H, Mohammadi A., Effect of gonadotropin-releasing
hormone analogue on pregnancy rate in Holstein cows given at different times
relative to artificial insemination, Onl J Vet Res., 20(2):94-103,
2016. Effect of single or double injections of a
GnRH-A on the pregnancy rate in Holstein cows given at two different times
relative to artificial insemination (AI) is described. Groups of 6 healthy
Holstein cows each were given G0P12, injection of Gonadorelin
(a GnRH-A, 5 ml at AI and sterile saline (5 ml) 12 h post AI; P0G12, injection
of sterile saline (5 ml) at AI and Gonadorelin (5 ml)
12 h post AI; G0G12, injection of Gonadorelin (5 ml) at AI and 12 h post AI; 4) P0P12 (CON),
injection of sterile saline (5 ml) at AI and 12 h post AI. Pregnancy diagnosis
was performed via rectal palpation 2 months after AI. Pregnancy rates were 89,
56, 67 and 67% for G0P12, P0G12, G0G12 and P0P12 groups, respectively.
Administration of GnRH-A at time of AI increased pregnancy rate numerically but
had no effect on pregnancy rate compared with
cows that received GnRH-A both at AI and/or 12 h post AI or those cows
that did not receive GnRH-A or controls.
Key words: Gonadotropin-releasing
hormone; Pregnancy rate; Holstein cows.
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