Vitamins: essential organic nutrients, required in small amounts, that cannot be synthesized by the body. Required for growth, maintenance, reproduction and lactation. Vitamin deficiency: decline in health due to the lack of a vitamin in a ration.itamins: essential organic nutrients, required in small amounts, that cannot be synthesized by the body. Required for growth, maintenance, reproduction and lactation. Vitamin deficiency: decline in health due to the lack of a vitamin in a ration.
Spermatogenesis is the process by which the male gametes, called sperm, are created. Spermatogenesis takes place in the seminiferous tubules, which are an intricate system of tubules in the testes where spermatogenesis takes place.
Spermatogenesis is the process in which male haploid germ cells are  produced from diploid spematogonial stem cells by way of mitosis  and meiosis.This occurs in the same â¦ way in rats in the  seminiferous tubules boundaries of the testes.permatogenesis is the process in which male haploid germ cells are  produced from diploid spematogonial stem cells by way of mitosis  and meiosis.