M8.7: Health and Reproduction in the Diary Herd: ANSC 100 Summer 2018 (WC).pdf

Disease incidence in the dairy industry can be quite

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Disease incidence in the dairy industry can be quite costly to the dairy farmer and can result in lost milk production, poor reproductive performance, excessive culling , or death of animals. While every effort is made to prevent diseases and disorders in dairy cattle, dairy farms must still contend with a variety of these conditions. A few of the more common diseases in the dairy industry include: scours (diarrhea) in calves, bovine virus diarrhea (BVD), respiratory diseases, and Johnes disease. Each of these is caused by some type of infectious organism and illnesses can vary from mild diarrhea to severe production losses to death. A few of the more common disorders seen in the dairy herd are: lameness, mastitis, ketosis, displaced abomasum, retained placenta, metritis, milk fever, and grass tetany (grazing herds). Each of the diseases and disorders is explained briefly below. Diseases Scours – Most common in calves, scours or diarrhea may be caused by a bacteria, virus or protozoa. Prevention is important, starting with feeding adequate amounts of good quality colostrum and maintaining good sanitation practices. Some commercial products are available for both preventing and treating calf scours. Bovine virus diarrhea (BVD) – Bovine virus diarrhea is caused by a virus and affects different ages of cattle differently. It is characterized by an acute diarrhea at onset in the herd but can also cause: infertility, embryonic death, abortion, congenitally damaged calves and persistently infected calves depending on when the animal contracts the disease. Respiratory diseases – One of the most common infectious agents is Infectious bovine rhinotracheitis or IBR. This acute and contagious virus affects the nasal passages and wind pipe and can cause abortions. Vaccination is common with animals that are being transported where likelihood of contracting IBR is greatest Johnes disease – Johnes (pronounced YO-nees) disease is a highly contagious disease caused by M. paratuberculosis bacterium. Johnes causes both loss of milk production and excessive culling in infected herds. It is a slowly progressing disease that impacts the intestines and may not be evident for some time after the initial infection. Symptoms are weight loss and diarrhea.
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7/8/18, 6(10 PM M8.7: Health and Reproduction in the Diary Herd: ANSC 100 Summer 2018 (WC) Page 3 of 6 Disorders Lameness – Lameness is dairy cattle can be caused by a variety of circumstances and also by infectious organisms. Extremely rough or extremely smooth walking surfaces, overcrowding of facilities, wet conditions, infrequent hoof trimming, and other conditions harmful to the integrity of the hoof or sole of the foot can lead to lameness. Once the hoof has been damaged due to these harmful conditions, infectious organisms may enter and increase the severity of the lameness.
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  • Spring '17
  • Robert mikesell
  • Test Prep, Mastitis, dairy farming, Health and Reproduction

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