Lesson Notes By Weeks and Term v4 - SHS 2

Lesson Video

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Performance objectives

• Explain key biological concepts for animal production.
• Describe how practices like selective breeding improve productivity.
• Analyze the economic impact of these biological practices.
• Reflect on real-life applications in your community.

Lesson summary

Good morning, class. Today, we are moving beyond the laboratory and the textbook to see how Biology can help us create businesses and improve our lives. In Ghana, agriculture, especially animal rearing, is a major source of income for many families. Whether it's raising chickens in the backyard, keeping goats and sheep, or large-scale cattle farming, understanding biology is the key to success. This lesson will show you how specific biological ideas you've already learned can be turned into practical tools to increase the number and quality of farm animals, leading to more food and more income. This is the heart of entrepreneurship in biology – using scientific knowledge to create value.

Lesson notes

(35 minutes)

This section breaks down the core biological principles that entrepreneurs in animal husbandry use to boost production. A. Selective Breeding (Artificial Selection) Definition: Selective breeding is the process where humans deliberately choose parent animals with desirable characteristics (traits) to breed together, in hopes that their offspring will inherit these traits. It is a form of artificial selection, guided by human needs rather than nature. Biological Principle: This process is based on the principles of genetics and heredity. We know that traits are controlled by genes, which are passed from parents to offspring. By selecting parents with the best genes for a particular trait (e.g., fast growth, high milk yield), we increase the probability of those genes appearing in the next generation. Process & Ghanaian Example: Imagine a poultry farmer in Dormaa Ahenkro wants chickens that lay more eggs and are also resistant to the local Newcastle disease. Identify Desired Traits: High egg production and disease resistance. Select Parents: The farmer observes his flock. He selects a hen that lays eggs almost every day (Trait 1) and a cockerel that survived a recent disease outbreak when others died (Trait 2). Breeding: He isolates this pair and allows them to mate. Select Offspring: He raises their chicks. From this new generation, he selects the hens that lay the most eggs and the cockerels that appear strongest and healthiest. Repeat: He breeds this "best of the best" offspring. Over several generations, the entire flock will be dominated by chickens that are both high-yielding and disease-resistant. Another Example: Crossing a West African Shorthorn cow (hardy, tolerant to trypanosomiasis) with a Friesian bull (produces a lot of milk) to get offspring that are both hardy and produce more milk. B. Supplementary Feeding Definition: This is the practice of providing extra nutrients or feed to animals to complement their main diet (like natural grass or forage). It ensures the animals receive a balanced diet, especially during periods when natural food is scarce (e.g., the dry season). Biological Principle: This relates to nutrition and metabolism. Animals need a balanced intake of carbohydrates (for energy), proteins (for growth and repair), fats, vitamins, and minerals for all metabolic processes to function optimally. Lack of any of these can stunt growth, reduce fertility, and weaken the immune system. Ghanaian Example: A goat farmer in the Northern Region notices his goats are losing weight during the long dry season when the grass is dry and low in nutrients. Action: He provides supplementary feed. This could be: Hay or Silage: Grass harvested and preserved from the rainy season. Agro-industrial by-products: Pito mash (from sorghum), groundnut or soybean cake, or cassava peels. Formulated Feeds: Commercially bought pellets containing a mix of maize, protein, and minerals. Result: The goats maintain their weight, the pregnant does give birth to healthy kids, and they continue to produce milk. This prevents losses and ensures a steady income. C. Flushing Definition: Flushing is a specialised form of supplementary feeding. It involves increasing the quality and quantity of feed for female animals (like ewes, does, and sows) for a few weeks *before* and during the mating period. Biological Principle: This directly manipulates the reproductive physiology of the female animal. A sudden increase in high-quality nutrition (especially energy and protein) sends a signal to the body that conditions are excellent for reproduction. This hormonal signal can trigger an increase in the ovulation rate – meaning the ovaries release more eggs than usual during a single cycle. Ghanaian Example: A sheep farmer in the Volta Region wants to increase the number of twin lambs born in his flock to sell for the Easter festival. Action: Three weeks before he introduces the ram (male sheep) to the ewes (female sheep), he starts giving the ewes a daily portion of a high-energy feed like corn or a special feed mix, in addition to their regular grazing. Result: The improved nutrition stimulates many of the ewes to release two eggs instead of one. If both eggs are fertilized, the ewe will give birth to twins. This can potentially double the farmer's output from the same number of ewes. D. Deworming and Disease Control Definition: Deworming is the practice of administering medicine (anthelmintics) to animals to get rid of internal parasites like roundworms, tapeworms, and flukes. It is part of a broader set of practices for disease control, which also includes vaccination and sanitation. Biological Principle: This is based on the concept of parasitism and pathology. Internal parasites live in the animal's digestive tract (stomach, intestines) and feed on the host's blood or the partially digested food. This has several negative effects: It robs the host of vital nutrients, leading to malnutrition, weight loss, and stunted growth. It can cause damage to the intestinal lining, leading to poor nutrient absorption and diarrhoea. Heavy worm infestation can cause anaemia (loss of red blood cells), a pot-belly appearance, and even death. Ghanaian Example: A pig farmer in the Ashanti Region observes that some of his young pigs are not growing well, have rough coats, and seem weak. He suspects worms. Action: He consults a veterinary officer who recommends a deworming schedule. He administers a dewormer (e.g., Albendazole or Ivermectin) to his entire stock, usually mixed in their feed or water. He also improves the sanitation in the pigsty, cleaning it regularly to prevent the pigs from picking up worm eggs from faeces. Result: After deworming, the pigs begin to gain weight rapidly because the food they eat is now being used for their own growth, not for feeding parasites. They become healthier, stronger, and reach market weight much faster. This reduces feeding costs and increases profit.

Guided Practice (With Solutions)

(15 minutes)

Evaluation guide

• Explain some basic concepts in Biology and how these can be used to improve animal
• production.
• Collaborative Learning: in small, random -based task -based groups, learners relate some basic
• concepts identified and studied in Biology to increase animal production