Here, we used a sheep bioassay to determine the effect of freezing colostrum to prevent the transmission of bovine leukemia virus (BLV) among neonatal calves. Leukocytes were isolated from the colostrum of a BLV-infected Holstein cow and were then either left untreated (control) or freeze-thawed. A sheep inoculated intraperitoneally with the untreated leukocytes was infected with BLV at 3 weeks...

Image processing technology is more commonly applied to such fields as virtual reality, biological medicine and permeates rapidly through agricultural scientific research. This paper described a linear appraisal system for analyzing dairy cow types based on image processing, which consists of hardware design, software design, realization of characters click points operating and the interactive ...

Anaphylactic reaction rarely occurs after the 1st injection of penicillin-streptomycin in cattle. Immediately following intramuscular injection of a Holstein-Friesian cow with penicillin-streptomycin, the cow showed abnormal clinical signs that included respiratory distress, urticaria, and lacrimation. Recovery took approximately 2 h after intramuscular injection of dexamethasone. This report p...

Subfertility has negative effects for dairy farm profitability, animal welfare and sustainability of animal production. Increasing herd sizes and economic pressures restrict the amount of time that farmers can spend on counteractive management. Genetic improvement will become increasingly important to restore reproductive performance. Complementary to traditional breeding value estimation proce...

the 24 maltiparous holstein dairy cows were allocated in a completely randomized design to study the effects of different level and source of sulfur supplement in close-up diets on blood metabolites, colostrums composition and liver performance. the mean body weight of the cows was 687.9 kg and the mean days until expected calving date was 21.8 d. the first treatment (t1) has contained 0.21% su...

This report describes a rare case of conjoined female twin monster (Monocephalus Thoracopagus Tetrabrachius Tetrapus Dicaudatus) in a Holstein Friesian pluriparous crossbred cow.

The objective of this study was to explore the effect dam body conformations on birth traits including stillbirth, dystocia, gestation length and weight Chinese Holstein calves provide a reference for improving cow reproductive performance. We collected phenotype data 20 conformation cows analyzed impact trait linear scores calf weight. feet angle, set rear legs, fore udder attachment height da...

No report has been published on the economical losses associated with errors in oestrus detection in cows under Iranian intensive dairy management. The following study was carried out to determine the accuracy of oestrus detection by farmers using artificial insemination in Shiraz dairy farms. Milk samples were collected from 179 Holstein milking cows at the time of artificial insemination. Mil...

Objective-To assess the effect of lameness on culling of dairy cows in Tehran province. DesignHistorical cohort study. Study population and procedures7067 firstand second-parity Holstein dairy cows that calved from March, 21 2007 to March, 2

The objective of this study was to quantify the efficacy a second intrauterine cephapirin treatment administered 14 d after initial one on subsequent reproductive performance postpartum dairy cows affected by purulent vaginal discharge (PVD) or endometritis (ENDO). In total, 4,140 Holstein from 30 commercial herds were enrolled in randomized clinical trial. At 36 (±7) milk, examined using Metri...