Fifteen rams of three breeds, five Barki, five local Awassi and five imported
Awassi breed were used in the present study. The study was aimed to investigate the
effects of breed and seasonal vartanons on seminal plasma amino acids
concentration throughout the experimental year. Results showed that there was a breed differences (p < O.01) in the
concentrations of different amino acids. Glutamic acid (a non-essential amino acid)
and threonine (an essential amino acid) were the predominant amino acids in all of
the three studied breed. However, the concentration of the glutamic acid was
significantly higher for local Awassi breed than the other two breeds. Threonine amino
acid was significantly high concentration for the Barld rams than the other two breeds.
In general it was found that total free amino acids in local Awassi seminal plasma
significantly higher than in seminal plasma of the other two breed. This trend was also
reflected on the essential and non-essential amino acids. Total free amino acids as well as the total essential ones were increased
significantly during summer season as compared to the other seasons. On the other
hand, total non-essential amino acids were significantly increased throughout spring
months. The increased value was more pronounced in therionine in summer and
glutamic acid in spring. 'Results also showed that Barki and local Awassi breed had
higher values of total amino acids at summer time which may suggest their suitability
for breeding at the semi-arid of the North West Coast of Egypt.