Search Results - "Van Amburgh, M. E."

Preweaning milk replacer intake and effects on long-term productivity of dairy calves by Soberon, F, Raffrenato, E, Everett, R W, Van Amburgh, M E

“…The preweaning management of dairy calves over the last 30 yr has focused on mortality, early weaning, and rumen development. Recent studies suggest that…”
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Decreased concentration of plasma leptin in periparturient dairy cows is caused by negative energy balance by Block, SS, Butler, WR, Ehrhardt, RA, Bell, AW, Van Amburgh, ME, Boisclair, YR

“…Dairy cows suffer from an intense energy deficit at parturition due to the onset of copious milk synthesis and depressed appetite. Despite this deficit,…”
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Nitrogen metabolism and recycling in Holstein heifers by Marini, J.C, Van Amburgh, M.E

“…To study the effect of dietary N level on urea kinetics and recycling, four Holstein heifers (267 ± 3.6 kg) were used in a Youden square design. Isocaloric…”
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Effect of nitrogen intake on nitrogen recycling and urea transporter abundance in lambs by Marini, J. C, Klein, J. D, Sands, J. M, Van Amburgh, M. E

“…Urea recycling in ruminants has been studied extensively in the past, but the mechanisms regulating the amount of urea recycled or excreted remain obscure. To…”
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Effect of intake of pasture on concentrations of conjugated linoleic acid in milk of lactating cows by Kelly, M L, Kolver, E S, Bauman, D E, Van Amburgh, M E, Muller, L D

“…We examined the effect of intake of fresh pasture on concentrations of conjugated linoleic acid in milk fat. Sixteen Holstein cows were paired and divided into…”
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Balancing dairy cattle diets for rumen nitrogen and methionine or all essential amino acids relative to metabolizable energy by Higgs, R.J., Chase, L.E., Schwab, C.G., Sloan, B., Luchini, D., LaPierre, P.A., Van Amburgh, M.E.

“…Improving the ability of diet formulation models to more accurately predict AA supply while appropriately describing requirements for lactating dairy cattle…”
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Ability of three dairy feed evaluation systems to predict postruminal outflows of nitrogenous compounds in dairy cows: A meta-analysis by Martineau, R, Ouellet, D R, Pellerin, D, Firkins, J L, Hanigan, M D, White, R R, LaPierre, P A, Van Amburgh, M E, Lapierre, H

“…Adequate prediction of postruminal outflow of protein fractions is the starting point for the determination of metabolizable protein supply in dairy cows. The…”
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Partition of nitrogen excretion in urine and the feces of holstein replacement heifers by Marini, J C, Van Amburgh, M E

“…Increasing public concern has been focused on animal production systems as a major nonpoint source of pollution. These studies were conducted to further our…”
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Development of a specific radioimmunoassay to measure physiological changes of circulating leptin in cattle and sheep by Ehrhardt, RA, Slepetis, RM, Siegal-Willott, J, Van Amburgh, ME, Bell, AW, Boisclair, YR

“…Studies of leptin in large domestic ruminants have been limited to measurements of gene expression because methods to measure circulating levels are not…”
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Effect of nutrition on the GH responsiveness of liver and adipose tissue in dairy cows by Rhoads, R P, Kim, J W, Van Amburgh, M E, Ehrhardt, R A, Frank, S J, Boisclair, Y R

“…Dairy cows enter a period of energy insufficiency after parturition. In liver, this energy deficit leads to reduced expression of the liver-specific GH…”
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Technical note: improved methodology for analyses of acid detergent fiber and acid detergent lignin by Raffrenato, E, Van Amburgh, M E

“…The objective of this study was to evaluate the methodology of the acid detergent lignin (ADL) assay in an effort to evaluate particle loss, improve…”
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Composition of growth of Holstein calves fed milk replacer from birth to 105-kilogram body weight by Diaz, M C, Van Amburgh, M E, Smith, J M, Kelsey, J M, Hutten, E L

“…Sixty calves were assigned to a comparative slaughter study to determine the changes in composition of milk replacer-fed Holstein bull calves from birth to…”
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Effect of varying carbohydrate and fat content of milk replacer on body composition of Holstein bull calves by Tikofsky, J. N, Van Amburgh, M. E, Ross, D. A

“…The objective of this study was to determine the effect of varying concentrations of dietary fat and carbohydrate on changes in body composition of Holstein…”
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Development and evaluation of equations in the Cornell Net Carbohydrate and Protein System to predict nitrogen excretion in lactating dairy cows by Higgs, R J, Chase, L E, Van Amburgh, M E

“…Nitrogen excretion is of particular concern on dairy farms, not only because of its effects on water quality, but also because of the subsequent release of…”
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Estrogen-dependent responses of the mammary fat pad in prepubertal dairy heifers by Meyer, M J, Capuco, A V, Boisclair, Y R, Van Amburgh, M E

“…Ovaries are absolutely required for development of the mammary parenchyma (PAR) in cattle, reflecting estrogen-dependent epithelial cell proliferation…”
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Composition and functional capacity of blood mononuclear leukocyte populations from neonatal calves on standard and intensified milk replacer diets by Nonnecke, B J, Foote, M R, Smith, J M, Pesch, B A, Van Amburgh, M E

“…Effects of increased dietary energy and protein on the composition and functional capacities of blood mononuclear leukocyte populations from milk replacer-fed…”
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Effect of nutrient intake on the development of the somatotropic axis and its responsiveness to GH in Holstein bull calves by Smith, J. M, Van Amburgh, M. E, Diaz, M. C, Lucy, M. C, Bauman, D. E

“…We investigated the effect of increasing nutrient intake on the responsiveness of the GH/IGF-I system in calves fed a high-protein milk replacer. Fifty-four…”
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Ontogenic and nutritional regulation of steroid receptor and IGF-I transcript abundance in the prepubertal heifer mammary gland by Meyer, M J, Rhoads, R P, Capuco, A V, Connor, E E, Hummel, A, Boisclair, Y R, Van Amburgh, M E

“…In prepubertal cattle, mammary development is characterized by the growth of an epithelial-rich parenchyma (PAR) into the mammary fat pad (MFP). This…”
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Effects of three prepubertal body growth rates on performance of Holstein heifers during first lactation by Van Amburgh, M E, Galton, D M, Bauman, D E, Everett, R W, Fox, D G, Chase, L E, Erb, H N

“…The effects of body weight (BW) gain, different sources of protein during the prepubertal period (90 to 320 kg of BW), and the performance of Holstein heifers…”
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Predicting requirements for growth, maturity, and body reserves in dairy cattle by Fox, D G, Van Amburgh, M E, Tylutki, T P

“…The 1996 National Research Council Nutrient Requirements of Beef Cattle equations used to compute growth requirements, target weights, and energy reserves were…”
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