University of Khartoum

Thermal , Haematological and Endocrine Responses of Crossbred Dairy Cows as Influenced by Season and Pregnancy

Thermal , Haematological and Endocrine Responses of Crossbred Dairy Cows as Influenced by Season and Pregnancy

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Title: Thermal , Haematological and Endocrine Responses of Crossbred Dairy Cows as Influenced by Season and Pregnancy
Author: Abdelatif, Abdalla M.; Elamin, Ahamed O.
Abstract: The objective of this study was to evaluate the effect of season and stage of pregnancy on thermal, haematological and endocrine responses of crossbred dairy cows under tropical conditions. The rectal temperature (Tr) and respiration rate (RR) were higher during summer at different stages of pregnancy; there was increase in Tr and RR with the advance of pregnancy. The packed cell volume (PCV) and haemoglobin concentration (Hb) were higher in summer; both parameters decreased in late pregnancy. Serum levels of glucose, cholesterol, triglycerides and urea were higher during summer compared to respective winter values. Serum glucose levels decreased with the advance of pregnancy. The activity of serum aspartate aminotransferase (AST) was higher in summer while alanine aminotransferase (ALT) was lower in summer compared to winter value. The serum calcium (Ca) level was higher and serum 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 (T3) level was higher in summer and there was slight 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 that for most of the parameters investigated, the effect of thermal environment was more pronounced compared to alterations related to the stage of pregnancy.
URI: http://khartoumspace.uofk.edu/123456789/21918


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