The Relationship Between Different Life Stages and the Concentration of Some Hormones in the Blood of Egyptian Buffalo Males
The Relationship Between Different Life Stages and the Concentration of Some Hormones in the Blood of Egyptian Buffalo Males
Hamdy Abdala Elnagar, Wael Mohamed Wafa*, Abdelaziz Mustafa Sakr, Mohammed Mahmoud Hegazy
ABSTRACT
The current study aimed to illustrate the changes in the levels of testosterone (TES), leptin, and prolactin (PRL) in the blood and their relationships with age advancing of Egyptian buffalo males from one up to 24 month of age. Blood samples were taken from 66 male buffalo calves at 1, 3, 6, 12, 18 and 24 month of age (11 animals at every age). TES, leptin and PRL levels were determined in blood plasma. Results showed insignificant increase in TES and PRL by age advancing at 1-3 month, and in leptin at 1-6 month of age. All hormones markedly increased up to 24 month of age. TES increased by increasing body weight (BW) from 40 to 420 kg. Leptin and PRL increased by increasing BW (>200 and >120 kg, respectively). The polynomial regression equation for all hormones gave the highest R2 values 0.889 and 0.971 for the unique measurement of age-TES and both age-leptin and age-PRL, respectively. A negative correlation was recorded between TES-leptin at all ages (r ranged between -0.656 and -0.995). The correlation between TES-PRL was significant at 1 (r=-0.701), 12 (r=-0.609), and 24 (r=-0.724) month of age. Leptin significantly correlated with PRL at 1 month (r=0.666), 6 (r= -0.659), and 24 (r=-0.804) month of age. The present results may suggest an increase in all hormonal levels (TES, leptin, and PRL), depending on progressing age or body weight of males. More acceleration was observed in testosterone than in prolactin and leptin by advancing age and/or weight of buffalo-male bulls.
Keywords | Buffalo-males, Blood, Testosterone, Leptin, Prolactin.
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