A longitudinal Bayesian threshold analysis of insemination events during the first 250 d after calving of first-parity Holsteins was carried out. The outcome of an insemination event was treated as a binary response of either a success (1) or a failure (0). Thus, all breeding information for a cow, including all service sires, was included, thereby allowing for a joint evaluation of male and fe...

Previous research indicates that high blood urea nitrogen (BUN) concentrations are associated with decreased fertility in lactating dairy cows.This experiment was done to evaluate the effects of equine chorionic gonadotropin (eCG) administration (with or without eCG) on fertility of lactating dairy cows with different levels of BUN subjected to fixed-time artificial insemination (FTAI).Ovulatio...

OBJECTIVE To determine whether the worldwide consensus that twin pregnancy after fertility treatment represents an adverse outcome to be avoided is correct. DESIGN Literature search via PubMed and MEDLINE, going back to 1990. SETTING Academically affiliated private fertility center. PATIENT(S) Mothers and offspring in singleton and twin pregnancies. INTERVENTION(S) None. MAIN OUTCOME ...

Profi tability of beef suckler herds is directly related to the number of calves reared per heifer or cow served annually. The economic consequences of high barren rates can, therefore, be very signifi cant, let alone the costs associated with the diagnosis and management of the problem causing poor fertility. In recent years, we have eradicated brucellosis, which used to be a major cause of re...

Increased cow productivity in the last few decades has depressed fertility and reproductive efficiency. Optimum uterus health and accurate true estrus detection have thus been greatly elusive on farm. The objective was to quantify cow cervix morphology during proestrus (PE), standing estrus (SE), diestrus (DE) and metestrus (ME) phases of the oestrus cycle using a novel biofarm technology. The ...

Longer lives and fertility far below the replacement level of 2.1 births per woman are leading to rapid population aging in many countries. Many observers are concerned that aging will adversely affect public finances and standards of living. Analysis of newly available National Transfer Accounts data for 40 countries shows that fertility well above replacement would typically be most beneficia...