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Stages of Pregnancy

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Rural Technology

The gestation period is divided into three parts based on the development stages of conceptus:

I) The period of ovum / zygote

1. It is the period upto 10-12 days after fertilization. 2. The zygote reaches uterus on 3rd – 4th day of fertilization. 3. In uterus, the Zygote remains free for short duration i.e. 8-15 days. 4. The Zygote is nourished by the secretion of uterine gland i.e. uterine milk.

II) The period of embryo

1. It extends from 13th to 45th day of pregnancy in cow. 2. It is characterized by formation of germ layers viz. endoderm, mesoderm and ectoderm which gives rise to different body parts / organs. 3. The digestive system, lungs, liver and circulatory system develops. 4. The heart starts beating by 21st to 22nd day. 5. The nervous, musculo-skeletal and urogenital system begins to develop. 6. The placenta usually formed in 20-30 days.

III) The period of foetus

1. It extends from 46th day of pregnancy to the parturition. 2. It shows progressive increase in size and weight of foetus. 3. There is development of bones and cartilages in different body parts. 4. The different body system progressively develops to the fully functional form. 5. There is growth of placenta and accumulation of fluids. 6. Hairs appear around the muzzle and eyes at 150 days and hair coat covers the body at about 230 days.

Intext Questions

Fill in the blanks: 1) The period of ovum / zygote after fertilization is days. 2) The period of embryo is characterized by formation of germ layers , and . 3) The placenta is usually formed in days in pregnancy. 4) The gestation period is divided into parts in pregnancy.

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