11 research outputs found
Uso de dilatador temporário em papilas mamárias de vacas, submetidas a lesões experimentais
Ultrasonography and theloscopy for the diagnosis of obstructive fibrosis in the Fürstenberg venous ring in the four quarters of the udder of a cow: a case report
Fatores de risco associados à alta contagem de células somáticas do leite do tanque em rebanhos leiteiros da Zona da Mata de Minas Gerais
Dynamic protein methylation in chromatin biology
Post-translational modification of chromatin is emerging as an increasingly important regulator of chromosomal processes. In particular, histone lysine and arginine methylation play important roles in regulating transcription, maintaining genomic integrity, and contributing to epigenetic memory. Recently, the use of new approaches to analyse histone methylation, the generation of genetic model systems, and the ability to interrogate genome wide histone modification profiles has aided in defining how histone methylation contributes to these processes. Here we focus on the recent advances in our understanding of the histone methylation system and examine how dynamic histone methylation contributes to normal cellular function in mammals
De veranderende taak van de dierenarts in de primaire produktie.
Enkele probleemgebieden uit de dierlijke produktiesector worden nader belicht. Het doel van dit artikel is aan te geven via welke wegen de dierenarts deze probleemgebieden kan benaderen en tevens wat daarvoor nodig is in onderzoek en opleidin
The veterinarian and the primary production of meat: epidemiology, and the concern about infectious diseases and risks.
Evaluation of Clinical and Somatic Cell Count as Diagnostic Tests for Surveillance of Udder Health in Dairy Herds
Relationships of Efficiency to Reproductive Disorders in Danish Milk Production: A Stochastic Frontier Analysis
Relationships of various reproductive disorders and milk production performance of Danish dairy farms were investigated. A stochastic frontier production function was estimated using data collected in 1998 from 514 Danish dairy farms. Measures of farm-level milk production efficiency relative to this production frontier were obtained, and relationships between milk production efficiency and the incidence risk of reproductive disorders were examined. There were moderate positive relationships between milk production efficiency and retained placenta, induction of estrus, uterine infections, ovarian cysts, and induction of birth. Inclusion of reproductive management variables showed that these moderate relationships disappeared, but directions of coefficients for almost all those variables remained the same. Dystocia showed a weak negative correlation with milk production efficiency. Farms that were mainly managed by young farmers had the highest average efficiency scores. The estimated milk losses due to inefficiency averaged 1142, 488, and 256 kg of energy-corrected milk per cow, respectively, for low-, medium-, and high-efficiency herds. It is concluded that the availability of younger cows, which enabled farmers to replace cows with reproductive disorders, contributed to high cow productivity in efficient farms. Thus, a high replacement rate more than compensates for the possible negative effect of reproductive disorders. The use of frontier production and efficiency/ inefficiency functions to analyze herd data may enable dairy advisors to identify inefficient herds and to simulate the effect of alternative management procedures on the individual herd's efficiency