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John Currin

Title Summary Date ID Author(s)
Anaplasmosis in Beef Cattle

Anaplasmosis is an infectious disease of cattle caused by several species of the blood parasite Anaplasma. A. marginale is the most common pathogen of cattle.

May 1, 2009 400-465
Beef Cow/Calf Herd Health Program and Calendar

It is widely agreed that prevention rather than treatment is the most economical approach to keeping disease losses low. Treatment of a disease after its onset is not always

May 1, 2009 400-007
Calving Emergencies in Beef Cattle: Identification and Prevention

Calving difficulty, technically called dystocia, is a major cause of death loss in cow-calf herds. CHAPA (Cow-calf Health and Productivity Audit) studies indicate that dystocia is responsible for 33 percent of all calf losses and 15.4 percent of beef cattle breeding losses.

May 1, 2009 400-018
Current Strategies in Parasite Control in Virginia Beef Cattle

Many advances have been made in the field of livestock parasite control over the past few years. Because parasites decrease production, usually through decreased weight gain, advances in the control of parasites can have a direct economic impact on beef cattle operations.

May 1, 2009 400-802
Environmental Streptococci and Enterococcus spp.: A Practical Summary for Controlling Mastitis Jul 12, 2012 DASC-7P
Escherichia coli: A Practical Summary for Controlling Mastitis Jul 29, 2011 404-224
Feeder and Stocker Health and Management Practices

Disease represents a major problem in most feeder and stocker settings. In some instances, outbreaks of disease can result in as much as a 30% death loss. In addition, treatment costs, feed efficiency losses, and the expenditures and labor necessary for treatment, as well as the necessity of culling animals which fail to respond to treatment, make disease loss substantial in many situations.

May 1, 2009 400-006
Foot Rot in Beef Cattle

Foot rot is a common disease of cattle that can cause severe lameness and decreased weight gain. Other common names for the disease are sore foot and foul foot.

May 1, 2009 400-310
Heifer Inventory and the Economics of Replacement Rearing

Profitability in the dairy business is NOT the herd with the larger milk check, or the greater volume in the bulk tank, but the producer who retains a larger sum of revenues at the end of the month (income minus expenses equals profits). One of the larger expenses incurred on the dairy is replacement heifer rearing. Replacement rearing is second only to feed cost for the lactating cows. In surveys of dairy expenditures, this item accounts for 9 to 20% of the total expenses on the farm. In the authors' experience, producers are seldom aware of what heifers cost to raise, and most producers think that these expenses are negligible. Heifers are a high cost item when expenses are divided among the various enterprises on the farm.

May 1, 2009 404-287
Klebsiella spp.: A Practical Summary for Controlling Mastitis Jul 29, 2011 404-223
Milk Production Evaluation In First Lactation Heifers

A critical evaluation of production in first lactation heifers once they reach the milking herd is important to determine the effects of the heifer rearing program. This can easily be done by monitoring start-up milk (milk production 0 to 40 days in milk), start-up milk butterfat and protein, and peak milk, peak milk butterfat and protein (41 to 100 days in milk) because these are directly related to heifer development.

May 1, 2009 404-285
Mycoplasma in Beef Cattle

Mycoplasma is a tiny bacterium that has a long history of causing disease in the cattle industry. Beginning in the early 2000s, it has emerged as an important entity in Virginia.

May 1, 2009 400-304
Mycoplasma in Dairy Cattle

Mycoplasma is a tiny bacterium that can cause mastitis, metritis, pneumonia, drooped ears, and lameness in dairy cattle. While this bacterium has existed for more than 100 years, the current disease was first recognized in the 1960s and 1970s, and has only recently become a problem in Virginia. There has been a steady rise in the frequency and severity of disease associated with Mycoplasma in the last ten years. Mycoplasma is a highly contagious disease that can have devastating economic effects on a dairy farm due to decreased milk production, additional veterinary costs, culling of cows, calf loss, and treatment cost. All dairy animals can be infected, including calves, heifers, dry cows and lactating cows.

May 1, 2009 404-038
Pinkeye in Beef Cattle

Pinkeye, also known as infectious bovine keratoconjunctivitis (IBK), is one of the most common diseases of beef cattle in Virginia. It is a highly contagious disease, causing inflammation of the cornea (the clear outer layer) and conjunctiva (the pink membrane lining the eyelids) of the eye.

May 1, 2009 400-750
Recognition and Treatment of Bovine Respiratory Disease Complex

The recognition and treatment of Bovine Respiratory Disease Complex (BRDC) is vital to the economic well-being of the stocker cattle producer. This disease is also known as shipping fever, or simply pneumonia.

May 1, 2009 400-008
Reference Guide for Mastitis-Causing Bacteria Jun 10, 2010 404-230
Serratia spp.: A Practical Summary for Controlling Mastitis Jul 29, 2011 404-225
Silage Density Sep 5, 2013
Staphylococcus aureus: A Practical Summary for Controlling Mastitis Jul 29, 2011 404-226
Strategic Use of Antibiotics in Stocker Cattle

Bovine respiratory disease complex (BRDC), or shipping fever, remains the most important health issue facing stocker-cattle producers. Despite many advances in our understanding of BRDC, vaccine technology, and new antibiotics in the last 40 years, the percentage of cattle that develop BRDC and the number that die from it have remained relatively unchanged.

May 1, 2009 400-307
Streptococcus agalactiae: A Practical Summary for Controlling Mastitis Jul 19, 2012 DASC-6P
Streptococcus dysgalactiae: A Practical Summary for Controlling Mastitis Jul 12, 2012 DASC-5P
Streptococcus uberis: A Practical Summary for Controlling Mastitis Jul 12, 2012 DASC-8P