منابع مشابه
DAI RY PRODUCTION Energy Metabolism of Dairy Cattle
Energy metabolism research during the past 25 yr has resolved many uncertainties of energy use by lactating cows. Use of metabolizable energy for milk production essentially is unaffected by milk yield but is slightly influenced by its source. Estimates of efficiency of use for milk production (60 to 64%) are lower than earlier estimates (69 to 70%) primarily because of lower maintenance costs....
متن کاملIntegration of ruminal metabolism in dairy cattle.
An important objective is to identify nutrients or dietary factors that are most critical for advancing our knowledge of, and improving our ability to predict, milk protein production. The Dairy NRC (2001) model is sensitive to prediction of microbial protein synthesis, which is among the most important component of models integrating requirement and corresponding supply of metabolizable protei...
متن کاملL ipid Metabolism in Dairy Cattle During T ransition: Impact of Controlled Energy Diets
Many dairy operations large and small continue to be plagued by a high incidence of metabolic disorders and infectious diseases around calving. Turbulent transitions increase health care expenses, decrease milk production, impair reproductive performance, and result in premature culling or death. Farm profitability and animal well-being both suffer. Despite many years of research and field emph...
متن کاملRegulation of Amino Acid Metabolism in Dairy and Beef Cattle
Dairy cattle • In cows fed well-balanced rations, mammary uptake of amino acids is influenced more by metabolic demand than by arterial supply. • Changes in mammary blood flow accommodate changes in metabolic demand for amino acids but are unlikely to be the primary regulator of mammary uptake and utilization of amino acids or other substrates. • Capacity of Na-dependent and Na-independent syst...
متن کاملRuminant Nutrition: Dairy Cattle
A total of 45 lactating Holstein cows averaging 617 kg of BW were allotted at wk 20 of lactation to 9 groups of 5 cows blocked for similar DIM to determine the effects of feeding different concentrations of flax hulls (FH) on DMI, milk production, milk composition, and digestion. Cows within each block were assigned to one of the 5 isoenergetic TMR containing 0, 5, 10, 15 or 20% FH. The experim...
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ژورنال
عنوان ژورنال: Journal of Dairy Science
سال: 1981
ISSN: 0022-0302
DOI: 10.3168/jds.s0022-0302(81)82692-6