Aim: This study was conducted to evaluate the concentrations of sodium (Na+) and potassium (K+) ions in milk of lactating dairy cows with and without subclinical mastitis as putative indicators for detecting subclinical mastitis in dairy cows. Materials and Methods: Thirty seven lactating dairy cows were screened for the evidence of subclinical mastitis using California mastitis test (CMT). The...

Improvement of reproduction in dairy cows has become a major challenge in dairy production. We have recently shown that dairy cows carrying the 'fertil-' haplotype for one quantitative trait locus (QTL), affecting female fertility and located on the bovine chromosome 3, had a significantly lower conception rate after the first artificial insemination than cows carrying the 'fertil+' haplotype. ...

Subacute ruminal acidosis (SARA) represents one of the most important metabolic subclinical disordersof high producing dairy cows, having serious impact in both animal health and herd profitability. The aim ofthis study was to confirm the presence of SARA in Greek dairy herds and record its prevalence and riskfactors. Ruminal fluid samples, via rumenocentesis, were obtained from a total of 153 ...

Objective-  To study the effect of digit amputation on animal survival, and distribution of   lesions on limbs, days in milk and parity in operated cows.   Design- Retrospective descriptive study.   Animals- Thirteen cows in a dairy herd consisting 1100 lactating Holstein cows.   Procedures- Digit amputation by using a loop wire after inducing local intravenous anesthesia. Results- Digits of ...

The objective of this study was to determine effect of dietary essential oil (EO) compounds, which contained cinnamaldehyde, eugenol, peppermint, coriander, cumin, lemongrass, and an organic carrier on feed intake, milk composition, and rumen fermentation of dairy cows during heat exposure. Thirty-two Holstein cows (days in milk= 60 ± 5) were assigned to one of two treatment groups: a Control a...

In four healthy cows an elevation of ketone bodies was induced by reduction of feed intake. Two cows became clearly ketotic while the other two cows showed only slight increases in ketone body concentrations in serum and milk. Acetone concentrations in exhaled breath were measured by gas chromatography combined with mass spectrometry. These values were correlated with concentrations of serum be...

BACKGROUND Over two decades of observations in the field in South East Asia and Hawai'i suggest that majority of the commercial dairy herds are of black hair coat. Hence a simple study to determine the accuracy of the observation was conducted with two large dairy herds in Hawaii in the mid-1990s. METHODS A retrospective study on longevity of Holstein cattle in the tropics was conducted using...

the aim of this study was to consider reproductive performance parameters and blood progesterone concentration changes in high-producing dairy cows (39±2 kg per day) after artificial insemination, in summer and winter. 270 heads of holstein dairy cattle were choose in three big dairy farms, and blood samples were collected at days seven, ten and fourteen after artificial insemination. temperatu...

According to the most recent National Animal Health Monitoring System for dairy cattle (National Animal Health Monitoring System, 2008), leading causes of morbidity in dairy cattle are clinical mastitis, lameness, infertility, retained placenta, milk fever, reproductive problems, and displaced abomasum. Of cows removed from herds, about 53% leave for one or more of the above reasons. Additional...

• a). By far the most common group is comprised of dairy cows, and occasionally beef cows, with hypocalcaemia. b). In beef heifers, most commonly Herefords, and occasionally in dairy heifers. Usually there is some evidence of at least minor dystocia. The soft tissues appear to have been stretched beyond their limits of immediate and adequate recovery. There is often, but not always, some loss o...