Nutritional Management of Transition Dairy Cows: Strategies to Optimize Metabolic Health

摘要: Abstract During the transition period, dairy cows undergo large metabolic adaptations in glucose, fatty acid, and mineral metabolism to support lactation avoid dysfunction. The practical goal of nutritional management during this timeframe is these adaptations. National Research Council addressed for first time 2001; however, a substantial amount research has been reported since publication was released. Results 2-group strategies dry minimize overfeeding nutrients early period but increase nutrient supply facilitate adaptation late period. Increasing energy supplied through dietary carbohydrate prepartum results generally positive effects on performance cows. Recent research, suggests that form (i.e., starch vs. highly digestible neutral detergent fiber) may be lesser importance. Attempts by feeding fat sources or decrease expenditure supplying specific acids such as trans -10, cis -12 conjugated linoleic acid milk output do not release nonesterified (NEFA) from adipose tissue. Although view means have limited ability enhance hepatic export NEFA triglycerides lipoproteins ruminants become dogma, recent evidence choline process Adaptation calcium facilitated cation-anion difference (DCAD) diet fed prepartum, although degree which DCAD must decreased sufficiently prevent hypocalcemia remains controversial. also provided possible physiological links between associations primary infectious disease with occurrence secondary disorders, thereby enabling investigation factors affecting variation response programs farms.