[Objective assessment of udder filling degree in diary cattle during shows]

INTRODUCTION

Overbagged udders are commonly seen at dairy cow shows in Switzerland and abroad due to prolonged milking intervals. In recent years various studies documented the negative effects of prolonged milking intervals and examined the objectivity of an ultrasound-based assessment scheme for determining udder filling. In addition, risk factors were calculated which lead to udder edema outside the puerperal phase. For example, the effects of a sudden increased 24-hour milking interval were altered behavior (reduced feeding time, increased rumination time) and a significantly increased cell count in experimental cows. Edema formation was observed sonographically in the subcutaneous udder tissue at the sites of predilection known from previous studies. No evidence of edema was observed in cows milked at 12 hour intervals. Based on these results, a new scoring system was defined using ultrasound images of show cows (grade 0 = no edema, grade 1 = slight, grade 2 = moderate, grade 3 = severe edema). Results documented that experienced clinicians were able to score ultrasound images reliable (interobserver reliability κ = 0.815, three different clinicians; intraobserver reliability κ = 0.90 and κ = 0.85, two clinicians) and little variability existed between the clinicians. A prolonged milking interval was identified as the main risk factor. Modified Swiss Dairy Show Regulations were implemented by January 1st, 2018 and ultrasonographic examinations proofed to be reliable in practice. Since January 1st, 2019 visual scoring of the udder filling is evaluated as part of a pre-show inspection. The sonographic evaluation can be used as a reliable diagnostic addition.

Short communication: Risk factors for sonographically detectable udder edema in overbagged cows at dairy shows

At dairy cow shows, the appearance of the udder is very important. To show cows at their best, udders are often presented in an overbagged state by extending milking intervals before the show. This practice represents an animal welfare issue because it is associated with behavior changes (e.g., excessive abduction and decreased eating time) and may affect the health of the animal. The aim of the current study was to determine the association between various parameters (e.g., milk yield, days in milk, milking procedures, or administration of nonsteroidal anti-inflammatory drugs, steroids, or diuretics) and the sonographically detectable udder edema score. Data were collected from the show catalogs, by interviewing the exhibitors, by analyzing official veterinary treatment protocols and official milking data, via laboratory analysis of blood samples, and by sonographic examinations of the udders at the show. For sonographically detectable udder edema scoring, 3 scans were taken, 1 on each fore quarter and 1 incorporating both rear quarters at the level of the median suspensory ligament. For grading the scans, a scoring system of 4 grades (score 0 = no edema, 1 = slight edema, 2 = moderate edema, 3 = severe edema) was used. Data from 321 cows of different breeds were collected at 4 highly competitive Swiss dairy shows (shows A-D) between January and September 2017. To determine risk factors for sonographically detectable udder edema, data were analyzed with 2 different logistic regression models. In model 1, the odds ratios were 3.33 (milking intervals of ≥16 h vs. <14 h), 3.84 (show A vs. show C), and 7.39 (dairy breeds vs. dual-purpose breeds). Milking intervals of dairy breeds were significantly higher than those of dual-purpose breeds. In model 2, milking interval was the only significant risk factor with an odds ratio of 9.00 for milking intervals of ≥16 h. Only the milking intervals represented a relevant risk factor in both models; therefore, we concluded that the previously described sonographic udder edema scoring is a useful technique for detecting overbagged udders at dairy shows. Its routine implementation may improve cow welfare at dairy shows.

Clinical and Patient-reported Outcomes of a Zirconia Oral Implant

The objective of this study was to determine the clinical, radiographic, and patient-reported outcomes of a 1-piece alumina-toughened zirconia implant restored with single crowns (SCs) or 3-unit fixed dental prostheses (FDPs) after 3 y of observation. Forty patients received 53 implants, placed in a 1-stage operation with immediate temporization. Finally, 50 implants were restored with 24 SCs and 13 FDPs. To evaluate peri-implant bone loss, standardized radiographs were taken at implant insertion, at final restoration delivery, and after 1 and 3 y. Additionally, several soft tissue parameters and patient-reported outcome measures were evaluated. Linear mixed models with random intercept for each patient and patients as clusters were used to compare subgroups. Three patients did not receive a SC due to early implant loss, and 1 patient died. As a result, 36 patients with 49 implants were followed-up for 3 y, giving a cumulative survival rate of 94.2%. The average marginal bone loss amounted to 0.79 mm (SCs, 0.47 mm; FDPs, 1.07 mm; P < 0.001). After the delivery of the final prosthetic restoration, further bone loss was not statistically significant (0.09 mm; P = 0.700). Probing depth, clinical attachment level, and modified bleeding index increased significantly at the implant sites, whereas gingival recession decreased significantly. Compared with the pretreatment questionnaires, the patient-reported outcome measures showed a permanently improved perception of function, aesthetics, sense, speech and self-esteem. The survival rate of the investigated ceramic implant system seems to be comparable to reported survival rates of titanium implants when immediately restored. The recorded parameters suggest its potential for clinical utilization.

The promoter and enhancer of the inactive chicken beta-globin gene contains precisely positioned nucleosomes

Core histone octamers reconstituted in vitro onto DNA fragments containing the chicken beta-globin gene promoter are precisely positioned with respect to the underlying DNA sequence [1]. Here we show that this is also true of the chicken beta-globin gene enhancer. These nucleosome binding sites are also employed within transfected COS cell nuclei, where the chicken beta-globin gene is transcriptionally inactive. Similar results were found in vivo, where positioned nucleosomes were detected over the inactive beta-globin promoter in chicken brain cells and 5-day red blood cells, and over the inactive beta-globin enhancer in brain cells. In contrast, the promoter and enhancer regions were found to be nucleosome-free in 15-day erythrocytes where the beta-globin gene is active. We argue that these results suggest a role for positioned nucleosomes in the regulation of the transcription of the chicken beta-globin gene.