A farmer reared two groups of pigs for 10 weeks. The pigs had the same mean starting mass and were given the same mass of food.
| Rearing system | Mean increase in body mass per pig in kg | Pigs showing signs of stress in % |
|---|---|---|
| Small heated indoor pens | 37.5 | 32 |
| Larger outdoor enclosures | 30.0 | 8 |
A pressure group says the farmer should use the larger outdoor enclosures. Evaluate this claim. Use the data and your knowledge.
87 exam-style questions on AQA GCSE Biology 7.5 Food production, covering 7.5.1 Factors affecting food security, 7.5.2 Farming techniques, 7.5.3 Sustainable fisheries, and 7.5.4 Role of biotechnology. Each one has a worked solution and a mark scheme showing where the marks go.