Photo AI
A recent development in the dairy industry is the introduction of the Jersey–Holstein Friesian crossbred to achieve hybrid vigour - Leaving Cert Agricultural Science - Question b - 2020
Question b
A recent development in the dairy industry is the introduction of the Jersey–Holstein Friesian crossbred to achieve hybrid vigour. (i) Explain what meant by the ter... show full transcript
Worked Solution & Example Answer:A recent development in the dairy industry is the introduction of the Jersey–Holstein Friesian crossbred to achieve hybrid vigour - Leaving Cert Agricultural Science - Question b - 2020
Step 1
Explain what meant by the term hybrid vigour.
Answer
Hybrid vigour, often referred to as heterosis, is the phenomenon where the offspring of two genetically diverse parents exhibit enhanced biological qualities. This can include advantages such as improved growth rates, increased fertility, and greater resistance to disease. In the context of the Jersey–Holstein Friesian crossbred, this means that the offspring achieve better productivity and health than their purebred parents.
Step 2
Describe two genetic improvements this breed of animal has inherited from its parents.
Answer
-
Improved Milk Production: The Holstein parent contributes a higher milk yield, ensuring that the crossbred calves inherit the trait of being prolific milk producers.
-
Better Fat Content in Milk: The Jersey parent is known for its milk's rich fat content, which enhances the nutritional value and marketability of the milk produced by the crossbred.
Step 3
Outline two safety precautions you would take when working with animals.
Answer
-
Always maintain a safe distance and be aware of the animal's body language to prevent unexpected aggression or fear responses.
-
Use appropriate protective gear, such as gloves and boots, to reduce the risk of injury while handling animals.