Carbon footprints of case study dairy farms in southeast Australia

This study was designed to assess the potential of digital Infrared thermography as a prediction of ovulation In dairy cows. Twenty cows were synchronized usjng controlled internal drug release (CIDR) and prostoglandinF2a. Vulva and muzzle temperatures were measured every 12 h (hour) from CIDR Insertion to 31 h post PGF1a Injection and then every 4h until ovulation occurred. Thermal images obtained with a FLIR T620 series Infrared camera were analysed using ThermoCAM Researcher Professional 1.9 software. The relationships between vulva and muzzle temperature with time of ovulation were analysed by linear mixed model using Genstot version 14. The mean time of onset of standing oestrus was 66 ± 17 h after PGF2o Injection. Significant (P < 0.OS) changes of vulva and muzzle temperatures were observed 48 h prior to ovulation. Vulva and muzzle temperatures were significantly (P < 0.01) associated with time of day and showed diurnal rhythm over the experimental period. The highest and lowest vulva and muzzle temperatures were recorded around midday (10:00 ond 14:00) and in the early morning (around 06:00) respectively. Further biometrical approaches are required to confirm the potential use of this technology by comparing with hormonal level.

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35th Biennial Conference of the Australian Association of Animal Sciences

35

0728-5965

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