تأثير العمر في شكل النطف المجمدة لثيران الفريزيان

Abstract EN

This study was aimed to determine whether there are any differences in the shape and dimensions of bulls sperm using different ages as well as to know the maturity of the sperm, then choose the bull for insemination or to freeze the taken semen to be used in artificial insemination.

Now a day become morphology shape for sperm important item in valuation of the semen and chose the best normal sperm whence dimension and shape.

Methods were used and bulls were classified by age into three groups, the first group includes 4 bulls aged 2-4 years, second group includes 4 bulls 4-6 years old, third group includes 4 bulls 6-8 years old.

Semen of each group was taken randomly and the mature and intact semen were examined.

The results were revealed that the highest value of head’s length (6-8 years category) was (8.20),while for 4-2 years category was the least (7.81).

For the width, the third category was recorded the highest (4.51) along with the other.

The Eillipticity inducts that 4-2 years group was the highest value (1.85), while for elongation character the 2-4 years group was the highest with (0.3) compared with the other.