Wheat Phosphorus Availability: 2—In VivoStudy in Broilers and Pigs; Relationship with Endogenous Phytasic Activity and Phytic Phosphorus Content in Wheat

Abstract

In order to reduce the P concentration in manure, P availability in different plant feedstuffs should be determined. Wheat P availability has been studied by the digestive balance technique on broilers and pigs. Nineteen wheat samples were tested on broilers, giving a mean P retention of 57% (45–70%). P retention was observed to be linearly associated with the endogenous phytasic activity in wheats (r=0·58;P<0·05). This variability in P retention cannot be satisfactorily explained by the phytic P content of wheat. Four wheat samples were tested on pigs, giving a mean apparent P digestibility of 40%.

Genetic variability and stability of poultry feeding related characters in wheat, in relation to environmental variation

“…In consequence, the phytic acid phosphorus is not available and, in regions where there is a high concentration of intensive indoor animal production, it contributes to the pollution of surface water. Wheat, on the other hand, contains plant phytase whose activity varies depending on the variety [5,6,30]. This phytase is activated during digestion and liberates a substantial amount of the grain phosphorus [18].…”

“…Work on wheat NSP has been more recent and mainly centred around the way in which NSP influence the rheological properties of dough [8,22,28,31]. Viscosity studies have been carried out by Saulnier et al [29], and studies on the effect of the genotype on cell wall content and phytase activity have also been performed recently [5,6,9]. No The applied viscosities were measured according to the protocol used by Carré et al [13].…”

Effect of fertilization and variety on digestibility of phosphorus from plant feedstuffs in pigs

“…None of the factors studied significantly affected phytate P content of the wheat. Four batches with different P fertilization where tested with pigs by Barrier-Guillot et al (1996a) with no difference in P digestibility, which confirms our results. Düngelhoef and Rodehutscord (1995) reviewed effects of phytases on the digestibility of phosphorus in pigs.…”

Characterisation of European varieties of triticale with special emphasis on the ability of plant phytase to improve phytate phosphorus availability to chickens

“…Several grain constituents play a role in optimum utilisation of this cereal by poultry. Among them, both soluble non-starch polysaccharides (NSP), mainly arabinoxylans present in the albumen, and available phosphorus (P) are of great impact with regard to the nutritive value of the cereal and to the alimentary strategies to control environmental pollution problems (Carré et al, 1994;Barrier-Guillot et al, 1996b) and are worth consideration in varietal selection programmes. Improvements in nutritional value of triticale for broilers will increase the economical interest in replacing wheat by triticale in broilers (Korver et al, 2004).…”

“…In wheat, variability in P availability for poultry is mainly related to phytase activity but not to phytic P concentration (Barrier-Guillot et al, 1996b). Moreover, phytase activity displays a significant genotypic effect in wheat, although it is also influenced by a genotype  environment interaction (Barrier-Guillot et al, 1996a;Oury et al, 1998).…”