Role of the sensitivity of detection of oestrus in the submission rate of cows treated to resynchronise oestrus

Abstract

Failure to submit cows for insemination at a resynchronised oestrus was mainly due to cows not being in oestrus rather than due to a failure to detect oestrus.

Evaluation of Oestrous Detection in Dairy Cattle Comparing an Automated Activity Monitoring System to Visual Observation

“…Different technologies such as heat mount detectors and activity monitoring systems have been commercialized and validated (At‐Taras and Spahr ; Cavalieri et al. ,b). Activity meters such as pedometers or accelerometers for automated oestrous detection have been reported as useful (Kamphuis et al.…”

Comparison of four methods for detection of oestrus in dairy cows with resynchronised oestrous cycles

“…7 Examination of potential causes for a decline in submission rates of dairy cows with resynchronised oestrous cycles was examined in a companion study to that presented here. 8 The objective of this study was to compare the sensitivity and positive predictive value (accuracy) of four methods that were used for the detection of oestrus in dairy cows with resynchronised oestrous cycles and to determine if any particular method for detecting oestrus could be used to improve submission rates.…”

Evaluation of a cow‐side milk progesterone assay and assessment of the positive predictive value of oestrus diagnosis by dairy farmers in New South Wales

“…The manufacturer of the P4 Rapid assay advocates the use of cow‐side milk progesterone assays 19–23 days post‐insemination to enable the detection of low progesterone cows not diagnosed in oestrus by other means . One previous study found that 75% of phantom cows had high milk progesterone when return to oestrus was due, indicating that routine progesterone testing of potential phantom cows at 19–23 days may only detect a minority of eligible cows . Further research would be required to determine the extent to which a cow‐side progesterone assay may help to increase oestrus diagnosis and submission in cows 19–23 days post‐insemination.…”