Document Type : Research article
Authors
1
Department of Biochemistry, Animal Health Research Institute, Agriculture Research Center, Sohag, Egypt.
2
Department of Biochemistry, Animal Health Research Institute, Agriculture Research Center, Dokii, Egypt
3
Division of Infectious Diseases, Animal Medicine Department, Faculty of Veterinary Medicine, South Valley University, Qena, Egypt.
4
Division of Clinical Laboratory Diagnosis, Department of Animal Medicine, Faculty of Veterinary Medicine, South Valley University, Qena, Egypt.
10.21608/avmj.2025.314257.1360
Abstract
Dairy animals are very important for production in Egypt. The transition period is a critical period for animals which undergo different hormonal and biochemical changes. The present study was established to evaluate the effect of the transition period on some physiological and biochemical parameters in dairy cows. A number of 30 pregnant dairy Holstein cows were used for this study. Samples of animals were collected at the 2nd, 4th, and 6th week before calving, and at the 2nd, 4th, and 6th week after calving with a two-week interval. Also, samples from ration and water delivered to animals were collected for analysis of their contents. The result of the present study revealed a significant (p<0.05) increase in the level of progesterone, estrogen, prolactin, glucose, and MDA with a significant decrease in the level of cortisol, GSH, SOD, Ca, and P at the 2nd week before calving, compared to the 6th week before calving. There was a significant decrease (p<0.05) in the level of progesterone, estrogen, glucose, SOD, Ca, and P with a significant increase in insulin and prolactin levels at the 2nd week after calving compared to the 6th week before calving. Lastly, there was a significant increase in progesterone, estrogen, cortisol, glucose, and haptoglobin with a significant decrease (p < 0.05) in the levels of prolactin and GSH in the 2nd week after compared to the 6th week after calving.
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