CHEM 1000H Lecture Notes - Lecture 10: Coevolution, Digestion
14 Feb 2018
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Nutrient flow in the livestock sector (nutrition and production primer) There is this idea of a nutrient hierarchy covered in the previous lecture, where the top are things you ca(cid:374)"t li(cid:448)e (cid:449)ithout a(cid:374)d as they go do(cid:449)(cid:374) the list you ca(cid:374) li(cid:448)e (cid:449)ithout the(cid:373) for lo(cid:374)ger periods of ti(cid:373)e. Carbohydrates (sugars and starch) and (crude) protein are 2nd and 3rd respectively in the hierarchy, however both are crucial to the energy requirements of ewes and can be affected depending on pasture. Grain: higher energy, lower fibre (health risks increase), higher grains, shorter dtm. Forage: low energy, higher fibre, lower grains, longer dtm. Excess dietary phosphorus = excess manure p (organic or inorganic p) Some monogastrics can accommodate highly fibrous feeds (horses and rabbits) Digestion primarily by animals owns means (enzymatic) Inherently superior feed efficiency per unit weight feed. Can only manufacture protein by fecal recycling. Primarily fibrous feeds; highly co-evolved with grasses and other leafy plants.
