Simple Summary Reproductive efficiency is critical for profitability of dairy operations. The
first part of this manuscript discusses the key physiology of dairy cows and how to practically …

Lactating dairy cows are classified as spontaneous ovulators, in which establishment of
pregnancy depends on the accuracy of detection of behavioral estrus for correct timing of …

Simple Summary Drug delivery systems depending on nanotechnology have been recently
created to improve biological activity of drugs including hormones. Nanoformulated drugs …

The aim of these experiments was to study ovarian dynamics and fertility of Bos indicus beef
cattle submitted to 7-d progesterone (P4)-based fixed-time AI (FTAI) protocols using different …

The objective of this observational study was to evaluate the association between increased
physical activity at first artificial insemination (AI) and subsequent pregnancy per AI (P/AI) in …

Two experiments determined whether the addition of GnRH at the beginning of an estradiol
(E2)/progesterone (P4)-based synchronization protocol and/or a second dose of …

This study was conducted to (i) evaluate the requirement for the administration of GnRH
coincident with insertion of a progesterone-releasing intravaginal device (PRID) and (ii) the …

Three experiments evaluated ovarian dynamics and circulating progesterone (P4) during P4-
based protocols initiated with GnRH, estradiol benzoate (EB), or no additional treatment in …

Our objective was to evaluate the effect of 3 different Ovsynch protocols on progesterone
(P4) and pregnancies per artificial insemination (P/AI), where all cows received a P4 …

Sažetak Due to the successful genetic selection for higher milk production in Holstein dairy
cows, a dramatic decline in fertility rates has been observed around in the world in recent …