Exam Notes - Section 5

Exam Notes- - How do we measure wADF Acid detergent extraction ◦ Residue is extracted with H 2 SO 4 and ashedto get lignin value Subtracting the

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Unformatted text preview: How do we measure? wADF: Acid detergent extraction. ◦ Residue is extracted with H 2 SO 4 and ashedto get lignin value. Subtracting the difference gives you the cellulose value ◦ Increase ADF Decrease digestibility p NDF: Neutral detergent extraction with heat. Can be used to predict intake ◦ & NFC: Calculated by difference: ¡ NSC: Enzymatic measurement. =100 –(%NDF + %CP + %Fat +%Ash) Becoming an Microbial Nutritionist SWhat does the cow provide? ◦Low oxygen environment ◦Constant temp. (99-106*F) ◦Food ◦Neutral environment ◦Garbage removal S What does the bug provide? ◦Fiber digestion ◦High quality protein ◦VFA’s! ◦Synthesis of B vitamins What is Effective Fiber? &The capacity of the fiber to: 7Stimulate cud chewing wMaintain high acetate production ¡Promote salivation ¡Provide a rumen mat OMaintain rumen function and motility What happens if effective fiber is too low? FDrop in milk fat content SIncreased rate of passage &Loose manure 7Decrease in rumination 7550-600 min/d optimum 7Wood and bed chewing &Laminitis wAssociated with drop in rumen pH &Variable DMI oAbomasalulcers How can you monitor if you have enough fiber? DMI o Cud Chewing (>40-50% for resting cows). ◦Stressed cows don’t chew! w Milking Parlor, holding pen, stalls L Sorting L Manure ◦Observe and/or sift! & Milk Fat Content ¡ DM on Forages b Monitor cows for lameness How much is enough? 22% of ration DM to maintain a rumen pH of 6.0 and 20% of ration DM to maintain milk fat test above 3.4% 5 lbs. of long forage particles (over 1 1/2 in. long) are needed for normal rumen function Summary 7Why do cows need fiber? 7Why do cows need NFC? oTo feed the cow you need to feed the microbes! oMaintaining a balance between the amount of fiber, NFC, and RDP is essential to maximize the efficiency of the rumen microbial population. ◦You must consider the amount of effective fiber in the diet.tomaintain rumen health SUCCESSFUL DAIRY NUTRITION “A BALANCING ACT” U Available feeds and forages U Nutrient Requirements of the cow U Feeding facilities U Feeding manager - people! Three Rations on the Farm One that is formulated One that is fed One that is consumed KEY COMPONENTS U Dry cow body condition U Dry cow transition to milking herd U Good environment U Early lactation - high D.M.I. U Feeding the rumen microbes U Replenishing and maintaining desired body condition U No instant fixes MANAGING THE TRANSITION COW U Dry cow requirements U 0.57 - .62 Mcal NE/lb. of DM U 12% CP U D.M.I. - 2% of BW? U Prepartum depression in DMI - U 30% 5 - 7 days prepartum? .70 - .73 Mcal NE/lb. of DM U 12 - 15% CP?...
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This note was uploaded on 03/30/2008 for the course DASC 3274 taught by Professor Rejames during the Fall '07 term at Virginia Tech.

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Exam Notes- - How do we measure wADF Acid detergent extraction ◦ Residue is extracted with H 2 SO 4 and ashedto get lignin value Subtracting the

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