Mucosal phosphatase activity, phytate degradation, and mineral digestibility in 6-week-old turkeys and broilers at different dietary levels of phosphorus and phytase and comparison with 3-week-old animals

Ileal phosphorus digestibility of soybean meal for broiler chickens remains consistent across institutions in a collaborative study regardless of non-phytate phosphorus concentration in the pre-experimental starter diet

“…Using diets like those used in the current study, Rodehutscord et al (2017) reported 48 to 82% for P and 39 to 71% for Ca ileal digestibility, whereas ileal P digestibility range of 33 to 62% was recently reported by Olukosi et al (2022) . There was a higher P digestibility of experimental grower diets and, thus a higher intestinal uptake of P in the group that received the 3.5 g nPP/kg than the 4.5 g nPP/kg pre-experimental starter diet, which is in agreement with previous studies ( Yan et al, 2005 ; Rao et al, 2006 ; Rousseau et al, 2016 ; Sommerfeld et al, 2019 , 2020 ; Omotoso et al, 2023 ; Novotny et al, 2023b ). Feeding low dietary P to young broilers has been shown to increase P absorption by augmenting the expression of genes encoding the transcellular transport of P in the intestine ( Onyango et al 2006 ; Yan et al, 2007 ; Rousseau et al, 2016 ; Hu et al, 2018 ; Sommerfeld et al, 2020 ).…”

Comparison of mucosal phosphatase activity, phytate degradation, and nutrient digestibility in 3-week-old turkeys and broilers at different dietary levels of phosphorus and phytase

“…As 2 species were compared that differ markedly in their maturation rates ( Zuidhof et al, 2014 ; Tůmová et al, 2020 ), it is necessary to evaluate whether observed differences in phytate degradation and nutrient digestibility can be attributed to species effects or if effects of different physiological development were involved. Thus, a second trial was conducted with 6 wk-old turkeys and broilers, receiving similar dietary treatments as in the present trial ( Novotny et al, 2023 ). Many findings of the present study were confirmed in 6 wk-old birds.…”

“…As such, higher mucosal phosphatase activity coincided with higher prececal InsP 6 disappearance. Comparisons are being discussed in more detail in the companion paper ( Novotny et al., 2023 ).…”

“…On d 15, 240 birds of both species were allocated in groups of 10 to 48 perforated floor pens (1.15 m × 2.3 m for broilers and 3 m × 4 m for turkeys). The other animals remained in the pens on wood shavings for an additional 21 d, after which they underwent a similar trial reported in a companion paper ( Novotny et al, 2023 ). Each pen was equipped with 2 feeding troughs and 1 drinker.…”

Determination of TMEn, standardized amino acid digestibility, phosphorus digestibility, and phosphorus bioavailability in conventional and reduced phosphorus distillers dried grains with solubles

“…Phosphorus in plant ingredients generally has reduced digestibility for poultry as approximately two-thirds of the P in these ingredients is bound in phytate ( Tahir et al, 2012 ). Endogenous phytase activity in poultry is limited when feeding commercial diets due to the addition of inorganic P and high Ca levels ( Novotny et al, 2023 ); therefore, much of the P bound in phytate is unavailable to the animal if exogenous phytase is not supplemented in the diet. In contrast to many plant-based ingredients, conventional DDGS ( C-DDGS ) has been reported to contain large concentrations of nonphytate P ( Tahir et al, 2012 ).…”