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Full-Text Articles in Dairy Science
Effect Of Varying Rumen Degradable And Undegradable Protein On Milk Production And Nitrogen Efficiency In Lactating Dairy Cows Under Summer Conditions, Jeffrey D. Kaufman
Effect Of Varying Rumen Degradable And Undegradable Protein On Milk Production And Nitrogen Efficiency In Lactating Dairy Cows Under Summer Conditions, Jeffrey D. Kaufman
Masters Theses
The objective is to determine the effect of reducing nitrogen input through feeding low rumen degradable protein (RDP) and rumen undegradable protein (RUP) proportions on milk production, nitrogen efficiency and metabolism in heat-stressed cows. Forty-eight mid-lactating, Holstein cows were assigned to treatments using a randomized block design in a 2x2 factorial arrangement of treatments (n = 12/treatment). Treatments included two levels of RDP (10 and 8%) and two levels of RUP (8 and 6%). From d 1 to 21, a common diet (10% RDP-8% RUP) was fed to cows followed with their respective treatment diets fed from d 22 to …
Development Of Mathematical Models To Predict Volume And Nutrient Composition Of Fresh Manure From Lactating Holstein Cows, J.A.D. Ranga Niroshan Appuhamy, L.E. Moraes, L.E. Moraes, C. Wagner-Riddle, David Casper, J. France, E. Kebreab
Development Of Mathematical Models To Predict Volume And Nutrient Composition Of Fresh Manure From Lactating Holstein Cows, J.A.D. Ranga Niroshan Appuhamy, L.E. Moraes, L.E. Moraes, C. Wagner-Riddle, David Casper, J. France, E. Kebreab
David Casper
Organic compounds in dairy manure undergo a series of reactions producing pollutants such as ammonia and methane. Because various organic compounds have different reaction rates, the emissions could be accurately determined if amounts and concentrations of individual nutrients in manure are known. A set of empirical models were developed for predicting faecal and urinary water, carbon (C), nitrogen (N), acid detergent fibre and neutral detergent fibre output (kg/day) from lactating Holstein cows. Dietary nutrient contents, milk yield and composition, bodyweight, age and days in milk were used with or without dry matter intake (DMI) as potential predictor variables. Multi-collinearity, goodness …