Expression of behavioural signs of oestrus during mid-cycle in a dairy cow

Authors: Fisher MW, Lamming GE
Publication: New Zealand Veterinary Journal, Volume 52, Issue 5, pp 297, Oct 2004
Publisher: Taylor and Francis

Animal type: Cattle, Livestock, Production animal, Ruminant
Subject Terms: Diagnostic procedures, Endocrine/autocrine/paracrine, Oestrus/oestrous, Reproduction - female, Reproduction, Reproduction - hormones
Article class: Correspondence

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Abstract: Routine monitoring of commercial dairy herds has confirmed the occurrence of oestrus during the luteal phase of the cycle in a small proportion (<5%) of cows (Royal et al 2000). One such event occurred in one of four Friesian dairy cows being intensively monitored for progesterone and luteinising hormone (LH) concentrations in daily milk samples and 6-hourly blood samples collected from the jugular vein, throughout the postpartum period. Consequently, the endocrine parameters associated with heat during the luteal phase were noted (Figure 1). Although an observation on a single cow, the intensive sampling data available for this animal warrant publication.

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