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Exam Notes - Section 7

Exam Notes - Section 7 - Metabolic Disorders • Trends in...

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Unformatted text preview: Metabolic Disorders • Trends in dairy production – Genetics – Level of Production – Nutrition – Herd automation – Herd Size – – Personnel Fresh Cow Job Description: • Calve without assistance and clean within 12 hours • Experience no metabolic disease, no mastitis • Have a strong appetite • Milk 100 lb by 14 days in milk (DIM) • Lose no more than ¾ of a BCS • Cycle by 30 DIM, show heat by 50 DIM, breed back by 110-120 DIM • 75% of health problems occur 2wks pre and 4 wks. post calving Metabolic Disorders • Cows are more prone to developing metabolic disorders • However, well managed herd has low Incidence • Metabolic disease is usually broken management system • Key - Dry period • Prepartum – Fresh cow – Dry matter intake of the fresh cow is frequent commonality. – What can I do to encourage fresh cow intake? DMI, DMI, DMI Diseases which are considered to be related to nutrition: • Rumen acidosis • Milk fever • Ketosis, fatty liver • Displaced abomasum • Some reproductive dysfunctions • Lameness • Mastitis All above listed diseases are diseases of lactating cows but many of those problems start in the dry period ! • Environment • Absence of molds and mycotoxins in feed • Good intake • Qualitative nutrition Rumen Acidosis • Cause: excessive amount of rapid fermentable CHO, insufficient buffer capacity of the rumen or decreased absorption of produced acids • Forms: acute subacute (SARA) • Diagnosis: evaluating records - fat test (<3.5%)- production cow appearance - loose manure- decreased immunity: mastitis, liver abscesses- loss of BC, hair coat- lameness tests - rumenocentesis (pH 5.5-6.8), optimum pH = 6 Treatment and Prevention of Rumen Acidosis • Transition, balanced ration • Close up dry cow ration – Adequate fiber - straw feeding – Increased sol. CHO – starch – adjust rumen microorganisms – Vitamin nutrition - Vitamin E – 2,000 IU/day • Fresh cow group – Low fat**** - rumen inert fat? – Buffers – Highest quality forage – Best environment Parturient Paresis, Hypocalcemia Acute or peracute flaccid paralysis or somnolence of lactating dairy cows occurring usually 72 hours after calving. Cows with lower serum Ca than 7.5 mg/dl are considered as hypocalcemic. Normal Ca: 9-12 mg/dl. Three stages: 1. cow may be standing (Ca 6.5-7.5 mg/dl) 2. down in sternal position, trying to get up (Ca 3.5-6.5 mg/dl) 3. down, lateral, loosing consciousness (Ca< 3.5 mg/dl) Calcium importance Low Ca (<7mg/dl) predisposes cow to: 1. low muscle tone - downer syndrome- uterine involution, RP - metritis- rumen motility - DMI depression- abomasum motility - DA 2. high blood cortisol - immunosuppression 3. low blood insulin - impaired glucose uptake – ketosis Calcium importance • Milk fever is bad start for a high producing cow !...
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Exam Notes - Section 7 - Metabolic Disorders • Trends in...

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