this study was designed to determine the culling rates of 23 holstein dairy herds (with an average size of180 cows per herd) in neyshabur area in northeastern iran over a period of three years from 2001 to 2003.the average annual culling rate was 13.1%, (98.5% involuntary and 1.5% voluntary). of the total disposals(1612 cows), 53.48% were culled by the end of five years of age. poor fertility w...

The BOVINOSE project (www.bovinose.eu) aims to develop an “electronic nose” to detect estrus in a dairy cow, and thus to determine the optimal timing of artificial insemination. The physical principle is based on detection of sex pheromones that are secreted by the cow, exclusively during estrus. These pheromones are the natural olfactory signal for the bull that the cow is in heat. This techno...

The final goal of all dairy cow raising systems in the world is to use the available capacities and the cooperation of other sectors in order to solve the problems and issues, such as the limitations in time, man power and financial resources, for providing a complete answer. Therefore, the need for optimization of cow raising systems by prioritization of measures and plans is the most obvious ...

The satiating effects of cow dairy have been thoroughly investigated; however, the effects of goat dairy on appetite have not been reported so far. Our study investigates the satiating effect of two breakfasts based on goat or cow dairy and their association with appetite related hormones and metabolic profile. Healthy adults consumed two breakfasts based on goat (G-Breakfast) or cow (C-Breakfa...

background:mastitis is the most economically importantdisease in dairy industry worldwide. bulk tank milk (btm)analysis has been suggested for monitoring the udder healthstatus at herd level. objectives: a cross-sectional study wasconducted to evaluate udder health status in 15 holstein dairyfarms located in qom province. methods: bulk tank somaticcell count (btmscc) was analyzed using opto-flu...

Dairy cow mortality is an increasingly severe problem for the US dairy industry. The objective of this study was to examine a variety of herd management practices and herd characteristics to identify factors associated with increased cow mortality in US dairy herds. The National Animal Health Monitoring System's Dairy 2002 study surveyed dairy operations in 21 major dairy states. The complete d...

BACKGROUND Lactose, as the primary osmotic component in milk, is the major determinant of milk volume. Glucose is the primary precursor of lactose. However, the effect of glucose on lactose synthesis in dairy cow mammary glands and the mechanism governing this process are poorly understood. RESULTS Here we showed that glucose has the ability to induce lactose synthesis in dairy cow mammary ep...

The cost of milk production by farm size was decomposed into frontier and efficiency components with a stochastic cost curve using data on 755 USA dairy farms from the year 2000. The estimated frontier function is much flatter than the composite cost curve, and although the frontier cost of production decreases with farm size, that cost reduction is not as pronounced as a cost curve that includ...

The purpose of this study was to determine clinical disease incidence in eight non-seasonally calving, pasture-fed dairy herds in the southern highlands district of New South Wales. This was a longitudinal population study. The study included all cows that calved between January 1994 and December 1995 and consisted of 2111 lactation records from 1430 cows. The incidence of the more common disea...

Water is used in dairy farming for producing feed, watering the animals, and cleaning and disinfecting barns and equipment. The objective of this study was to investigate the drinking and cleaning water use in a dairy cow barn. The water use was measured on a well-managed commercial dairy farm in North-East Germany. Thirty-eight water meters were installed in a barn with 176 cows and two milkin...