Abstract
This study was conducted using Forty five dairy cows selected randomly from small different farms. Blood and milk samples were collected during three stages of lactation (early, middle and late), on each serum sample total proteins, albumin, glucose, urea, total lipids, cholesterol, triglycerides, calcium, phosphorus and magnesium were determined. In each milk sample fat %, total proteins, calcium, phosphorous, and magnesium levels were measured. A significant effect of the lactation stages were observed on glucose, urea, total lipids, cholesterol, triglycerides, and calcium, while there were no significant differences during the three lactation stages on serum total protein, albumin, phosphorus and magnesium. In case of the examined milk samples there were no significant differences in fat %, urea, calcium, phosphorus and magnesium in the different lactation stages. While, there was a significant increase in milk protein in the middle and late lactation stages.
Highlights
At the beginning of lactation, dairy cows have to cope with the high energy and protein demands for milk synthesis at the time when nutrient intake is low
On each serum sample total proteins, albumin, glucose, urea, total lipids, cholesterol, triglycerides, calcium, phosphorus and magnesium were determined by means of commercial kits (STANBIO laboratories, diagnostic company, USA) and measured using the spectrophotometer (Coles, 1986)
There were no significant changes in both phosphorus and magnesium in the different lactation stages
Summary
At the beginning of lactation, dairy cows have to cope with the high energy and protein demands for milk synthesis at the time when nutrient intake is low. The fat, protein and urea contents of milk vary according to stage of lactation. On each serum sample total proteins, albumin, glucose, urea, total lipids, cholesterol, triglycerides, calcium, phosphorus and magnesium were determined by means of commercial kits (STANBIO laboratories, diagnostic company, USA) and measured using the spectrophotometer (Coles, 1986).
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