1. Categorical Data Analysis;Agresti,1990
2. Straw bedding or concrete floor for loose-housed pregnant sows: consequences for aggression, production and physical health;Andersen;Acta Agric. Scand. Sect. A,1999
3. Behavioural thermoregulation in pigs;Baldwin;Physiol. Behav.,1967
4. Feeding motivation and stereotypes in pregnant sows fed increasing levels of fibre and/or food;Bergeron;Appl. Anim. Behav. Sci.,2000
5. The effect of mats on the welfare of sows and piglets in the farrowing house;Boyle;Anim. Welfare,2000