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 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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