Estimation of phosphorus requirements of sows based on 24-h urinary phosphorus excretion during gestation and lactation.

LACTATION; BIOLOGICAL models; BIOMARKERS; HOMEOSTASIS; PHOSPHORUS; ANIMAL experimentation; BLOOD plasma; BONE resorption; NUTRITION; GESTATIONAL age; SWINE; DIET; REGRESSION analysis; PREGNANCY outcomes; SOYBEAN; PARATHYROID hormone; PARITY (Obstetrics); DESCRIPTIVE statistics; STATISTICAL models; DOSE-response relationship in biochemistry; PREGNANCY

The article reports that Phosphorus requirements of reproducing sows were estimated using 24-h urinary P excretion. Thirty-six multiparous sows were fed one of six maize-soybean meal-based diets with total P ranging from 0·40 to 0·80 % in 0·08 % increments with a constant Ca:total P ratio (1·25:1). Diets were fed from day 7·5 ± 1 after breeding until the end of lactation (day 26 ± 1).