Abstract
An injection of prostaglandin F2α (PGF2α) in a cow that is past its voluntary waiting period after calving is considered a cheap way to increase the submission rate of dairy cows undergoing an artificial insemination (AI) programme and has proved popular for this reason. The results of this programme, however, would be considered by most to be variable and inconsistent, with heavy reliance on the ability of farm staff to accurately detect and record oestrus in their herd, both before and after its use, being one of the key drivers of ‘success’ with this protocol. In comparison, a programme such as GPG +P4, which utilises gonadotropin releasing hormone (GnRH), a progesterone-releasing intravaginal device (P4), as well as PGF2α, has significantly increased expense but produces more consistent results, and takes away reliance on the ability of farm staff to perform heat detection by allowing fixed time AI.
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