ANSC3101 Lecture Notes - Lecture 5: Heat Treating, Dietary Fiber, Dairy Cattle

• School: University of Sydney
• Department: Animal Science
• Course: ANSC3101
• Professor: Alex Chaves

Document Summary

Learning outcomes: from gross energy to net energy, concept of meabolisable energy (me) Gross energy (ge: the ge values for dried grass, wheat grain and poor quality wheat straw are almost the same, these material are very different in terms of their ability to meet the nutritional needs of the animal. Digestible energy (de: digestible energy = gross energy-faecal energy. In theory, methane reduction is possible-could save 2-12% of the ge value of the food. I(cid:374) pra(cid:272)ti(cid:272)e, it(cid:859)s (cid:374)ot easy (cid:894)(cid:373)i(cid:272)ro(cid:271)es (cid:272)a(cid:374) adapt to the feed a(cid:374)d the(cid:374) produ(cid:272)e the sa(cid:373)e a(cid:373)ount of methane) Heat increment of feeds: animals lose energy as faeces, urine, and gases-also heat, animals continuously lose heat to the environment. Effective rumen degradable protein (protein available to animals: erdp: effective rumen degradable protein. C4 pathway: mesophyll cell: preliminary fixation and rapid transport of co2 to kranz cells, bundle-sheath: co2 fixation through the calvin-benson cycle. Optimum 15-25 degree celsius (cid:894)(cid:272)a(cid:374)(cid:859)t deal with heat(cid:895)