Veterinary Science and Animal Husbandry
What the animal science paper tests
The Veterinary Science and Animal Husbandry section tests anatomy and physiology, nutrition, breeding, health and basic farm management. Questions often ask you to balance a ration, interpret a vaccination schedule, calculate gestation or breeding dates, or distinguish infectious from nutritional disease.
Core rules
- Crude protein (CP) is calculated as N x 6.25; energy terms (TDN, ME) are not interchangeable with CP.
- Pearson square balances two feeds to a target nutrient; the differences are taken diagonally and the parts are read on the same side as the feed opposite.
- Dry matter (DM) basis removes moisture; as-fed values include water. Never compare a DM requirement directly with as-fed feed without conversion.
- Ruminants use microbial fermentation; non-protein nitrogen such as urea is useful only with readily fermentable carbohydrate and adaptation.
- Colostrum must be fed early because immunoglobulin absorption in the newborn gut falls rapidly after birth.
Worked example
Mix maize (9% CP) and soybean meal (44% CP) to make a 20% CP concentrate. Pearson square: SBM difference = 44 - 20 = 24 parts maize; maize difference = 20 - 9 = 11 parts SBM. Total = 35 parts. Maize = 24/35 = 68.6%; SBM = 11/35 = 31.4%. Check: 0.686 x 9 + 0.314 x 44 = 6.17 + 13.82 = 19.99% CP. The larger difference belongs to the feed opposite it, which is the common error.
Traps
Reversing Pearson-square parts; ignoring the mineral-vitamin premix space; quoting CP on a DM basis while the mix is as-fed; confusing a vaccine reaction with an infectious disease; using urea without a carbohydrate source.