The objective of this experiment was to compare metabolic and milk production parameters in dairy cows supplemented and nonsupplemented with rumen-protected choline (RPC) during the transition period. Twenty-three nonlactating, multiparous, pregnant Holstein cows were ranked by BW and BCS 21 d before expected date of calving and immediately were assigned to receive (n = 12) or not receive (cont...

The aim of this study was to determine the effects different amounts crude glycerol (CGL) on dry matter intake, milk yield, protein and fatty acid profile dairy cows grazing a Kikuyu-based pasture. Six Holstein were used in first third lactation (mean ± SD 559 22.5 kg body weight, 43 10 days milk, 26.8 1.2 milk/day) randomized within replicated 3 × Latin square arrangement. Animals grazed Kikuy...

The most important products of the dairy industry are: pasteurized liquid milk, casein and products derived by casein, and whey protein concentrates. Among the different advanced processes developed for getting better quality products in comparison to those obtained with traditional technologies, the processes based on the use of dense carbon dioxide are preferable from many points of view. In ...

Bulk tank milk from 28 dairy farms was sampled every second month for 2 yr to assess the effects of grassland management, production system and season on milk fatty acid (FA) composition, concentrations of fat-soluble vitamins, Se, and milk sensory quality. Grassland management varied in terms of time since establishment. Short-term grassland management (SG) was defined as establishment or rese...

Twenty-five (10 ruminally cannulated) Holstein cows averaging 82 +/- 34 d in milk were assigned to 5 x 5 Latin squares (21-d periods) and fed diets supplemented with one of four different proteins to assess effects on production, ruminal metabolism, omasal flow of N fractions, and degradation rates of protein supplements. Total mixed diets contained (dry matter basis) 44% corn silage, 22% alfal...

The objective of this study was to examine the effects of concentrates containing different levels of a vitamin-trace elements premix on milk yield and composition of dairy cows. The trial, which lasted 14 weeks, was conducted from January to March and used 45 multiparous Brown cows in the early phase of lactation. Cows (n = 15 per treatment) were randomly allocated to three dietary treatments:...