Fecal Consistency as Related to Dietary Composition in Lactating Holstein Cows

Responses of Milk Urea Nitrogen Content to Dietary Rume Degradable Protein Level in Lactating Holstein Dairy Cows

Nine multiparous lactating cows averaging 171 days in milk were divided according to days in milk and milk production into three 3×3 Latin squares with three 3-week periods to investigate the effect of rumen degradable protein on milk urea nitrogen. Diets were formulated to provide 3 concentrations of dietary rumen degradable protein (9.8, 10.8, and 11.8% of dry matter), while rumen undegradabl...

Methane prediction in dry and lactating Holstein cows.

Data from six experiments (two with dry cows) were used to predict partitioning of gross energy to CH4 in Holstein cows using selected independent variables, some of which were intercorrelated, and a stepwise backward elimination regression procedure. Methane outputs ranged from 3.1 to 8.3% (mean 5.5) of gross energy intake for 134 dry cow balance trials and from 1.7 to 14.9% (mean 5.2) of gros...

Genetic Regulation of Feed Efficiency in Lactating Holstein Cows

New Synbiotic-Mineral Complex in Lactating Cows’ Diets to Improve Their Productivity and Milk Composition

The aim of this study was to investigate the effectiveness of a new experimental complex in diets of lactating cows. The scientific and economic experiments were conducted in conditions of a large industrial complex for milk production from cows of Holstein breed (Russia). Four groups of Holstein cows (third calving), 20 animals each, were formed to conduct an analog method research. The cows i...

effect of dietary starch source on milk production and composition, nutrient digestibility and plasma metabolites in lactating holstein cows

the objective of this study was to evaluate the effects of sources of four starch on milk production and composition, nutrients digestibility and blood metabolites of lactating holstein cows. eight multiparous holstein cows (683±31 kg of body weight; 83±9 dim) were used in a replicated 4×4 latin square design with 21-d periods. the exprimental diets contained wheat, barley, corn, or potato as t...