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Department of Animal Science, Cornell University, Ithaca, NY 14853
Corresponding author: T. Overton; e-mail: tro2{at}cornell.edu.
During the transition period, dairy cows undergo large metabolic adaptations in glucose, fatty acid, and mineral metabolism to support lactation and avoid metabolic dysfunction. The practical goal of nutritional management during this timeframe is to support these metabolic adaptations. The National Research Council addressed nutritional management of transition cows for the first time in 2001; however, a substantial amount of research has been reported since this publication was released. Results support 2-group nutritional strategies for dry cows to minimize overfeeding of nutrients during the early dry period but increase nutrient supply to facilitate metabolic adaptation to lactation during the late dry period. Increasing the amount of energy supplied through dietary carbohydrate during the prepartum period results in generally positive effects on metabolism and performance of transition cows. Recent research, however, suggests that the form of that carbohydrate (i.e., starch vs. highly digestible neutral detergent fiber) may be of lesser importance. Attempts to increase energy supply by feeding dietary fat sources or decrease energy expenditure by supplying specific fatty acids such as trans-10, cis-12 conjugated linoleic acid to decrease milk fat output during early lactation do not decrease the release of nonesterified fatty acids (NEFA) from adipose tissue. Although the view that nutritional means have limited ability to enhance hepatic export of NEFA as triglycerides in lipoproteins in ruminants has become dogma, recent evidence suggests that nutrients such as choline or specific fatty acids may enhance this process in transition cows. Adaptation of calcium metabolism to lactation is facilitated by nutritional strategies to decrease the cation-anion difference (DCAD) of the diet fed prepartum, although the degree to which the DCAD must be decreased to sufficiently prevent hypocalcemia remains controversial. Recent research also has provided possible physiological links between the associations of primary infectious disease with the occurrence of secondary metabolic disorders, thereby enabling investigation of factors affecting variation in response to nutritional management programs for transition cows on dairy farms.
Key Words: periparturient cow • metabolism • immune function
Abbreviation key: CLA = conjugated linoleic acids, CRC = controlled release capsule, DCAD = dietary cation-anion difference
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