Evaluating six automated estrus detection systems in dairy cows

Traditionally, the methods used to detect estrus in dairy cows include visual observation, tail painting, tail chalking, rump-based pressure and scratch-off patches. In high-producing cows, the duration and intensity of estrus behavior is considerably lower than that in dairy cows of a few decades ago. In fact, standing estrus only occurs in 30 to 80% of lactating dairy cows. For this reason, precision dairy monitoring devices (tag, leg, collar) that measure cow activity, rumination, and feeding and lying behaviors are commonly used for estrus detection.

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Presynchronization improves fertility in cows inseminated with sex-sorted semen

Presynchronization improves fertility in cows inseminated with sex-sorted semen

Using sex-sorted semen has become a common reproductive practice in the dairy industry. However, it has been shown that using sex-sorted semen reduces fertility which can be caused by the sorting process of the sperm altering the fertilizing capacity and viability of spermatozoa and/or the lower number of spermatozoa per straw.

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