Méta-analyse de l'utilisation digestive et métabolique du P chez le porc en croissance : effet de l'apport alimentaire de phosphore, de calcium et de phytase

National audienc

Effect of microbial phytase on growth performance, plasma phosphorus concentration and tibia mineralization of broilers according to dietary calcium and phosphorus concentrations

Résumé T229 Journal of Animal Science, Volume 88, E-Supplement 2 Journal of Dairy Science, Volume 93, E-Supplement 1 Poultry Science, Volume 89, E-Supplement 1International audienc

Dynamics of bone mineralization in primiparous sows as a function of dietary phosphorus and calcium during lactation

To maximize the efficiency of dietary P utilization in swine production, understanding the mechanisms of P utilization in lactating sows is relevant due to their high P requirement and the resulting high inorganic P intake. Gaining a better knowledge of the Ca and P quantities that can be mobilized from bones during lactation, and subsequently replenished during the following gestation, would enable the development of more accurate P requirements incorporating this process of bone dynamics. The objective was to measure the amount of body mineral reserves mobilized during lactation, depending on dietary digestible P and phytase addition and to measure the amount recovered during the following gestation. Body composition of 24 primiparous sows was measured by dual-energy x-ray absorptiometry 2, 14, 26, 70 and 110 days after farrowing. Four lactation diets were formulated to cover nutritional requirements, with the exception of Ca and digestible P: 100% (Lact100; 9.9 g Ca and 3.0 g digestible P/kg), 75% (Lact75), 50% without added phytase (Lact50) and 50% with added phytase (Lact50 + FTU). The gestation diet was formulated to cover the nutritional requirements of Ca and digestible P (8.2 g Ca and 2.6 g digestible P/kg). During the 26 days of lactation, each sow mobilized body mineral reserves. The mean amount of mobilized bone mineral content (BMC) was 664 g, representing 240 g Ca and 113 g P. At weaning, the BMC (g/kg of BW) of Lact50 sows tended to be lower than Lact100 sows (−12.8%, linear Ca and P effect × quadratic time effect) while the BMC of Lact50 + FTU sows remained similar to that of Lact100 sows. During the following gestation, BMC returned to similar values among treatments. Therefore, the sows fed Lact50 could recover from the higher bone mineral mobilization that occurred during lactation. The P excretion was reduced by 40 and 43% in sows fed Lact50 and Lact50 + FTU, respectively, relative to sows fed Lact100. In conclusion, the quantified changes in body composition during the lactation and following gestation of primiparous sows show that bone mineral reserves were mobilized and recovered and that its degree was dependent on the dietary P content and from phytase supplementation during lactation. In the future, considering this potential of the sows’ bone mineralization dynamics within the factorial assessment of P requirement and considering the digestible P equivalency of microbial phytase could greatly limit the dietary use of inorganic phosphates and, thus, reduce P excretion

Effect of microbial phytase on growth performance, plasma phosphorus concentration and tibia mineralization of broilers according to dietary calcium and phosphorus concentrations

Résumé T229 Journal of Animal Science, Volume 88, E-Supplement 2 Journal of Dairy Science, Volume 93, E-Supplement 1 Poultry Science, Volume 89, E-Supplement 1International audienc

Meta-analysis of prececal digestibility of phosphorus in growing broilers: effects of dietary phosphorus, calcium and phytase supply

International audienc

Meta-analysis of the impact of dietary phosphorus, calcium, and microbial phytase on growth performance in broilers

International audienc

Modelling the fate of dietary phosphorus in the digestive tract of growing pigs: a way to optimize phytase efficacy in releasing dietary P

Résumé W237 Journal of Animal Science, Volume 88, E-Supplement 2 Journal of Dairy Science, Volume 93, E-Supplement 1 Poultry Science, Volume 89, E-Supplement 1International audienc

Modelling the fate of dietary phosphorus in the digestive tract of growing pigs: a way to optimize phytase efficacy in releasing dietary P

Résumé W237 Journal of Animal Science, Volume 88, E-Supplement 2 Journal of Dairy Science, Volume 93, E-Supplement 1 Poultry Science, Volume 89, E-Supplement 1International audienc