Effect of nutritional status on nutrient and gas utilization by the mammary gland of lactating sows

Milk synthesis being a continuous process in lactating sows, the mammary gland has to adapt its metabolism response extreme short-term changes nutrient availability arterial bloodstream, due feeding pattern. The objective of present study was better quantify and understand these adaptations. effect morning refeeding after an overnight 16-h feed withdrawal measured on uptake energy-supplying nutrients, amino acids (AA), some vitamins minerals. After farrowing, catheters were fitted right anterior vein carotid artery six sows. Blood samples drawn days 7, 14, 21 lactation, every 30 from 60 min before meal 300 meal. Plasma concentrations glucose, lactate, triglycerides (TG), non-esterified fatty (NEFA), glycerol, α-amino nitrogen (N), B12, folates determined all samples. Riboflavin AA only 120 Arterial venous plasma N increased (P < 0.01), NEFA, TG decreased 0.01). Mammary arteriovenous concentration difference for remained constant TG, NEFA 0.01) glycerol 0.05). meal, but with differed among AA. Arteriovenous energy (7.6 kJ/l plasma) similar feed-deprived fed contribution various nutrients differed, respiratory quotient lower (0.95) than (1.54). relative contributions 50.2, 3.8, 25.1, 0, 20.8% 24.6, 2.2, 24.9, 32.9, 15.0% respectively. daily extraction vitamin estimated differences higher amount this bioavailable diet, probably contributing 50% decrease between day 7 lactation. For both riboflavin folates, small or not different zero. These results indicate that great capacity very rapidly modify according available bloodstream.