Question 29 cannot be answered without the illustration. For Questions 30 and 31, identify the correct answers and explain the reasoning. Use the provided hormonal information for Question 31.

• Milking: Animals are often restrained, especially in milking parlors, for safety and efficiency.
• Slaughtering: Animals are always restrained for humane and safe slaughter.
• Vaccination: Animals are restrained to ensure proper and safe administration of the vaccine.

All three listed operations typically require some form of animal restraint.

The correct option is D.

Dystocia refers to difficult or prolonged labor.

• Progesterone: Maintains pregnancy.
• Oestrogen: Involved in estrus (heat cycle).
• Oxytocin: Stimulates uterine contractions and milk let-down. It is used to aid delivery if contractions are weak, provided there is no physical obstruction.
• Prolactin: Primarily involved in milk production.

Oxytocin is commonly used to stimulate uterine contractions during dystocia.

The correct option is C.

• Improves taste of feed: Salt can enhance palatability.
• Supplies vitamins: Salt primarily supplies sodium and chloride, which are minerals, not vitamins. Vitamins are a separate class of nutrients.
• Prevents spoilage of feed: Salt can act as a preservative, inhibiting microbial growth.
• Improves appetite: Sodium is an essential electrolyte that can stimulate appetite.

Salt does not supply vitamins.

The correct option is B.

• Hoof trimming: While pigs can occasionally have overgrown hooves, routine hoof trimming is not a standard, widespread practice in pig management compared to other livestock like horses or cattle, especially if pigs are on surfaces that naturally wear down their hooves.
• Creep feeding: A common practice where young piglets are given access to feed separate from the sow.
• Teeth clipping: A common practice to clip the needle teeth of piglets to prevent injury to the sow's udder and other piglets.
• Ear notching: A widely used method for identifying individual pigs.

Hoof trimming is the least common routine practice among the options.

The correct option is A.

The illustration shows an elevated cage-like structure, typical for poultry (e.g., a chicken coop or battery cage system).

• Shredded paper: Can be used but may become soggy quickly and offers limited insulation.
• Wood shavings: Excellent bedding material for poultry due to good absorbency, insulation, and comfort.
• Sawdust: Similar to wood shavings but finer; can be dusty, potentially causing respiratory issues.
• Dry grass: Can be used but may compact easily, become moldy, and is less absorbent or insulating than wood shavings.

Wood shavings are generally considered one of the best options for poultry bedding.

The correct option is B.

Such units often involve restricted movement and hard surfaces.

• Expose birds to predators: While possible if the cage is not fully enclosed, many such units are designed with wire mesh to prevent this.
• Reduce the growth rate of birds: Restrictive housing can cause stress, which might affect growth, but it's not the most direct or severe disadvantage compared to physical health issues.
• Predispose birds to paralysis: Limited movement and hard flooring in restrictive cages can lead to leg problems, bone weakness, and conditions like cage layer fatigue or leg paralysis, especially in fast-growing broiler chickens or laying hens.
• Increase wastage of feed: Feeders in these systems are usually designed to minimize wastage.

The impact on physical health, such as predisposing birds to paralysis due to restricted movement and hard surfaces, is a well-documented disadvantage of intensive cage systems.

The correct option is C.