Interval from Oestrus to Ovulation in Dairy Cows-A Key Factor for Insemination Time: A Review.

This review describes the oestrus-to-ovulation interval, the possibility of predicting the time of ovulation, and the optimum time for insemination relative to oestrus in dairy cows. The duration of oestrus in dairy cows is approximately 8-20 h, with differences possibly related to the methods of oestrus detection and the frequency of observations. Most cows ovulate approximately 24-33 h after the onset of oestrus and 15-22 h after the end of oestrus.

Use and adequacy of non-pregnancy diagnosis in cow. Which future?

In cattle, early detection of gestation is very important from an economic and management point of view in all types of farming. However, due to the poor efficiency of oestrous detection, it is essential to determine non-pregnant cows as early as possible, in order to minimize the inter-insemination interval, thus de facto, reducing herd open days. Direct and indirect gestation diagnostic methods have been developed with the aim of improving the reproductive performance of the herd.

Effect of pegbovigrastim on clinical mastitis and uterine disease during a full lactation in grazing dairy cows.

In this randomized controlled trial on four commercial grazing dairy farms, we investigated whether pegbovigrastim (PEG) treatment affects clinical mastitis (CM) and uterine disease (i.e. retained placenta (RP), metritis and endometritis) occurrence during a full lactation.

Ultrasound imaging of the bull reproductive tract: an important field of expertise for veterinarians.

Diagnosing male reproductive system pathologies can often be frustrating because of the challenge involved in precisely determining their site, severity, and prognosis. The introduction of complementary ultrasonographic examination enables clinicians to address these important questions. This procedure should be performed not only on bulls destined to artificial insemination, but on all farm bulls.

Ultrasonography of the bovine female genital tract.

The objective of this article is to help interested readers learn to use ultrasound for female bovine reproductive tract examinations. The first section discusses practical issues for using ultrasound in the field, such as animal restraint and preparation, type of ultrasound units available, and scanning technique. The second section reviews ultrasound diagnosis of various ovarian structures.