PROCESSES OF EGG FORMATION IN POULTRY
Subject:
Agricultural Science
Class:
SSS 1
Term:
Third Term / 3rd Term
Week:
Week 8
Topic:
PROCESSES OF EGG FORMATION IN POULTRY
Previous Knowledge: The pupils have previous knowledge of
REPRODUCTION IN FARM ANIMALS (CONT)
that was taught in their previous lesson.
Behavioural Objectives : At the end of the lesson, learners will be able to
- Draw and label the diagram of an egg.
- List five reproductive hormones, site of secretion and their functions
Instructional Materials
- Wall charts
- Online Resource
- Textbooks
- Laptop
- Wikipedia
Methods of Teaching
- Role modelling
- Questions and Answers
- Explanation
- Discussion
- Recitation
- Imitation
- Story Telling
- Dramatization
WEEK EIGHT
PROCESSES OF EGG FORMATION IN POULTRY
PROCESSES OF EGG FORMATION IN POULTRY
The egg in poultry is partly formed in the ovary and in the oviduct. At ovulation the ovum carrying the yolk is released by the ovary into the oviduct through the funnel called infundibulum. Fertilization takes place in the infundibulum where the egg spends 15 minutes and moves into the magnum. In the magnum, part of the egg white (albumen) and the chalaza are secreted round the yolk. The egg stays for 3 hours in the magnum and moves into the isthmus where the two shell membranes are formed. The egg stays for 1 hour 15 minutes in the isthmus and moves into the uterus where it remains for 18 – 21 hours and the egg shell is formed from calcium carbonate. Mineral solutions are also added to the egg before it moves into the vagina whereit remains for 1 – 15 minutes before it is laid through the cloaca. A complete formation of eggs takes almost 26 hours.
AND FEMALE REPRODUCTIVE HORMONES
Hormones are organic chemical substances produced by endocrine (ductless) glands which
influence growth, development and metabolic activities in farm animals. These include
| HORMONE | SEX | SITE OF SECRETION | FUNCTIONS |
| Testosterone/ Androgen | Male | Testes | It stimulates the development of secondary sexual characters in male. It stimulates sperm production through spermatogenesis. |
| Oestrogen | Female | Ovary | It stimulates the development of secondary sexual characteristics in female animals It promotes the production of ova or eggs through oogenesis. It stimulates mammary gland development |
| Progesterone | Female | Corpus luteum | It ensures uterus development and implantation of the fertilized ovum. It inhibits oestrus i. e. prevents ovulation. It stimulates the development of mammary gland It ensures the continuance of pregnancy. |
| Oxytocin | Female | Pituitary | It aids the contraction of the uterine wall during parturition. It promotes milk let-down after parturition. It aids sperm transportation in the vagina. |
| Relaxin | Female | Pituitary | It aids relaxation of pelvic ligaments during parturition. |
| Follicle stimulating hormone (FSH) | Female | Pituitary | It stimulates the growth of ovarian follicle. |
| Luteinizing hormone | Female | Pituitary | It stimulates the secretion of oestrogen and progesterone. It causes the rupture of the follicle and the release of the ova from the follicle. |
Presentation :
The topic is presented step by step
Step 1: The class teacher revises the old topic
Step 2: The class teacher introduces the new topic
Step 3: The class teacher allows the pupils to give their own contributions and gives room for pupils” participation
Class Teacher and Pupils Activities. Interaction or Participation
This involves class teacher and pupils’ interaction, conversation, imitation or modeling through discussion, play method or just by recitation or asking and answering questions that are related to the topic that has just been taught.
EVALUATION
- Lists five signs of approaching parturition
- Why is colostrum important for the new born animals?
- Write short note on the development of an embryo.
- Describe the right positioning of a lamb prior to expulsion.
- List five animal hormones and function.
- What are the functions of the following in the processes of egg formation in poultry?
- Ovary
- Oviduct
- Magnum
- uterus
Conclusion :
The class teacher concludes the lesson by giving the pupils some notes on the topic that has just been taught. He goes round to mark and he does the necessary corrections.