AGR 2350 Lecture Notes - Lecture 4: Propylene Glycol, Negative Energy, Delaval
7 Dec 2017
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Document Summary
When we formulate a ration, we do so on a dm basis. When we feed a ration, we do so on an as-fed (af) basis. A feedstuff has 7% protein on an af basis. The same feedstuff has a dm content of 50% Protein content on a dm basis is 14%. 4r"s of rumination: regurgitation, remastication, resalvation, reswallowing. Symbiotic relationships with each other and host animal. Ten times more microbial cells vs. host animal cells. Reticulum: first compartment, often included with rumen (reticulorumen: hardware disease. Omasum: regulates digesta passage based on particle size. Abomasum: true stomach: secretes hcl and pepsin. Fibre: neutral detergent (ndf) and acid detergent (adf) Water 0. 87 kg per kg milk (~30kg/d) Soybean/soybean meal, canola, alfalfa, field peas, urea. Never want to see empty feed bunks: restricting feed restricting milk yield. Need to adjust feeding levels per animal/pen to have minimal amounts of feed left. Pushing up feed in between feedings helps maximize use.
