Summary studies of dairy cow removal indicate increasing levels of mortality over the past several decades. This poses a serious problem for the US dairy industry. The objective of this project was to evaluate associations between facilities, herd management practices, disease occurrence and death rates on US dairy operations through an analysis of the National Animal Health Monitoring System's...

Stress commonly associated with weaning, marketing, and shipment of feeder cattle can temporarily compromise immune function, thereby reducing the effective response to vaccination intended to control bovine respiratory disease (BRD). Two vaccination timing treatments were used to evaluate the effect of timing of a multivalent modified live virus (MLV) BRD vaccine on health, performance, and in...

The ability of mononuclear cells (MC) from peripheral blood of normal cattle to lyse a variety of cells was tested in a 51Cr-release microcytotoxicity assay. Several types of bovine cells infected with parainfluenza 3 virus (PI3V) were susceptible to natural cytotoxicity. Bovine cells infected with infectious bovine rhinotracheitis virus or noncytopathogenic bovine viral diarrhea virus, uninfec...

A multivalent vaccine consisting of inactivated bovine herpes virus-1 (BHV-1), also known as infectious bovine rhinotracheitis virus (IBR), para-influenza type-3 virus (PI3) and the leukotoxin of Pasteurella haemolytica A1, were combined with the addition of aluminium hydroxide as adjuvant, and administered to post-weaned calves, and the serum tested for seroconversion to each antigen. Two grou...

Infectious bovine keratoconjunctivitis, also known as pinkeye, is an economically important disease in cattle. The objective of this study was to detect QTL associated with infectious bovine keratoconjunctivitis in offspring from a Brahman x Hereford sire. The sire was mated to Hereford, Angus, and F1 cows to produce 288 offspring in 1994 and mated to MARC III ((1/4) Hereford, (1/4) Angus, (1/4...

A total of 332 dairy cow’s sera samples were collected from Kombolcha and Dessie districts North Ethiopia to determine the sero-prevalence infectious bovine rhinotracheitis (IBR), Brucellosis. Sera split into equal portions competitive ELISA was used for testing IBR in first portion while Rose Bengal test (RBT) Complement Fixation Test (CFT) detection Brucellosis second portion. Sero-posi...

Molecular biology and technical advances in DNA recombination have ushered in a new era in vaccinology. This article examines the recent development of specific marker vaccines and examines the impact of their use on the diagnosis and prevention of major infectious diseases. Gene-deleted vaccines, DIVA strategies (differentiating infected from vaccinated animals) and similar methods have been s...