There is a commercial demand for the ability to predetermine the sex of livestock. For example, a producer may want female calves from the best cows for replacements and male calves for beef production. Dairy producers may want more females for replacing cows or… The head of the sperm varies in shape for each animal species. In humans it is flattened and almond-shaped, four to five micrometres long and two to three micrometres wide there are about 25, micrometres in an inch. The head portion is mainly a cell nucleus; it consists of genetic substances, called chromosomes , which are responsible for transmitting specific characteristics of an individual, such as the colour of eyes, hair, and skin. The sperm cells have only 23 chromosomes, or half of the usual number.
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As gametes, sperm have a design unlike other cells in the body. The components of sperm enable it to fulfill its purpose of fertilizing a woman's egg. Only males create sperm in their bodies. Sperm fight each other as they swim toward the egg, but only one can enter the ovum and grow into a human being. Function Sperm exist to unite one half of the man's DNA with one half of the woman's. Since it only has a half set of DNA, sperm cells are referred to as haploid, meaning half.
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The spermatozoa of different groups of animals exhibit great variety of form. Those of chordates, however, show a remarkable uniformity of structure. The tail consists of four components—neck, mid-piece, principal piece and end piece Phillips, The whole cell of sperm is streamlined and paired down for action of a special sort and of limited duration, namely, to swim and to meet an egg, to fuse with the cortex of an egg, and to introduce sperms nucleus and Centriole in the egg interior.