[POPM 4230] - Final Exam Guide - Everything you need to know! (37 pages long)

• School: University of Guelph
• Department: Population Medicine
• Course: POPM 4230
• Professor: Terri O' Sullivan

Document Summary

~ go from eating 2% of bw when growing and peak at 4% when grown. Transition = moving from not milking to milking (8 wks centered around calving) Development of lactation in mammary gland ~ 3 weeks. Rumen microflora adaption ~ 10-14 days (due to diet change) Social adjustment to new group ~1 week. Diet composition, bcs, parity, and time from calving together explain only 18% of cow-to-cow variation in prepartum dmi. Little evidence for lack of rumen/gut space (early on thought to be gut fill) Burning non-efa in liver may inhibit dmi. Probable roles of insulin (esp. postpartum) and leptin in decrease dmi: fetal growth, rumen and gut adaptation to diet change, initiation of lactation, opening of teats and reproductive tract, rapid, large calcium demand. ~ goes from 2-4% intake, change in nutrient flow going to liver, liver had to be ale to handle this. ~ burning fat, feedback through leptin which could limit dmi.