University of Khartoum

Metabolic and Endocrine Responses of Crossbred Dairy Cows in Relation to Pregnancy and Season Under Tropical Conditions

Metabolic and Endocrine Responses of Crossbred Dairy Cows in Relation to Pregnancy and Season Under Tropical Conditions

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Title: Metabolic and Endocrine Responses of Crossbred Dairy Cows in Relation to Pregnancy and Season Under Tropical Conditions
Author: Alameen, Ahmed Omer; Abdelatif, Abdalla Mohamed
Abstract: Abstract: The aim of this study was to evaluate effects of season and stage of pregnancy on metabolic and endocrine responses of crossbred dairy cows under tropical conditions. The effects of season (summer vs winter) on serum constituents were evaluated in 4 groups of cows; a group of empty cows and 3 groups representing early, mid- and late pregnancy. Serum levels of cholesterol, triglycerides and urea were higher during summer compared to respective winter values. Plasma glucose levels decreased with the advance of pregnancy in winter. During summer, the activity of serum aspartate aminotransferase (AST) was higher while alanine aminotransferase (ALT) was lower compared to winter value. Serum calcium (Ca) level was higher and serum inorganic phosphorus Pi level was lower in summer. With the advance of pregnancy, there was a decrease in Ca level and an increase in Pi level. Serum thyroid stimulating hormone (TSH) was elevated in summer compared to winter. Serum triiodothyronine (T ) level was higher in summer and there was sligh3 t decrease with the advance of pregnancy in both seasons. Serum thyroxine (T4) level was lower in summer. Serum cortisol level increased in response to summer heat load and it was higher during late pregnancy in both seasons. The results indicate the importance of thermal environment and physiological status in assessment of metabolic profile in crossbred dairy cows.
URI: http://khartoumspace.uofk.edu/123456789/21861


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