Weight Changes in Lactating Holstein Cows

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

Economic Value and Produced Milk Quality in Holstein Lactating Cows in Organic System

In the past decade, a global demand for products from organic agriculture has increased rapidly. Milk quality is of major interest for all parties. Therefore, the objective of this study was to compare cow performance and product quality in conventional and organic system. Twenty Holstein dairy cows were allotted to one of 2 diet groups, which including: a conventional diet (CON), and an organi...

Changes in serum electrolytes of holstein cows with periparturient diseases

Role of prostaglandins in the development of hyperthermia in heat-stressed, lactating Holstein cows.

Heat stress can have severe effects on the physiology and productive function of lactating dairy cattle. Among the negative effects are hyperthermia, metabolic alkalosis, reduced feed intake, decreased milk yield, and increased embryonic mortality (Ealy et al., 1993; Miller et al., 1999; Ominski et al., 2002). The hyperthermia coincident with heat stress occurs largely because animals cannot di...