Nutritional adjusts using InraPorc model to gestating sows housed in deep bedding systems

Collective housing for gestating sows has advanced in Brazil pig production. However, knowing the nutritional demands inherent to the housing system requires specific tools that integrate genetic, nutritional and environmental informations. This study aimed to evaluate the nutritional and feeding strategies using the InraPorc model in pregnant sows housed in deep bedding systems. Eighty DanBred sows were used, selected in parity order, weight and backfat thickness. The experimental design was a randomized block and treatments were assigned to feeding program used by the Farm (FPFm) and nutritional and feeding program proposed by InraPorc tool (FPIn). Sows were housing in groups of 20 animals in pens containing rice hulls. InraPorc considering group housing, active behavior of sows (360min) and average temperatures of 16.5?C (27 to 85 days) and 15.7?C (85 to 110d) to estimate the nutritional requirements. The InraPorc proposed an increase of 8% in nutrient intake to meet the requirements for thermoregulation, body condition and physical activity based on a diet containing 73.4% DM and 2,8 Mcal/kg ME. Feed intake for FPIn group were 8.3% higher (P < 0.01) in 27-85 days of gestation (3.0 vs 2.7kg/d) and 8.7% higher (FPIn: 3.4kg/d, FPFm: 3.2kg/d; P < 0.01) in 86-110d of gestation. Nutritional adjustment increased by 5% body weight at 110d gestation (FPIn: 230.0kg, FPFm: 219.1kg; P < 0.05). Weight gain during pregnancy in relation to breeding (?G% PV) was 24.8% higher in sows with nutritional adjustment by InraPorc (FPIn: 24.8kg, FPFm: 14.6kg; P < 0.05). However, backfat thickness at 110 days did not differ between groups (FPIn: 16.3mm, FPFm: 15.0mm; P> 0.05). Collective housing in deep bedding increases the demand of nutrients for pregnant sows. The InraPorc tool identifies nutritional deficiencies and accordingly proposed a feed program for pregnant sows housed in deep bedding systems.