Read this article in:

Microbial phytase supplementation of low-P sorghum-canola meal diets with no added inorganic phosphorus in swine

Aspergillus niger phytase supplementation may contribute to inorganic P reduction in grain-oilseed meal diets.

Tuesday 23 October 2018 (7 months 25 days ago)
Like

The objective of the present study was to assess the effect of phytase supplementation of sorghum-canola meal diets without added inorganic phosphorus (iP) on growth performance, apparent total-tract P, calcium (Ca), nitrogen (N), and energy utilization, bone strength, bone ash and serum Ca and P concentrations. For that purpose, two experiments were carried out. For the first trial, 42 crossbred barrows were fed in individual metabolism cages a P-deficient diet for 7 d before starting a 28-d experiment. This trial consisted on 7 treatments that were a negative control (NC) diet supplemented with 0, 400, 800, 1200, or 1600 U of Aspergillus niger (AN) phytase/kg, a positive control (PC) diet, and the PC diet supplemented with 1200 U of AN phytase/kg. Fecal and urine collections were made from d 21–26, and blood samples were collected on d 0, 14, and 28. For the second trial, 126 growing-finishing crossbred pigs with an initial BW of 21.6 kg were group-fed (3 pigs/pen) in 3 phases (grower, early-finisher, and late-finisher). The second trial consisted on 6 treatments that were a NC diet for each phase supplemented with 0, 200, 400, 600, or 800 U of AN phytase/kg and a PC diet. Fecal collections were made from d 49–54 and blood was collected on d 35, 63, and 91.

In both trials, 400 U of AN phytase/kg of diet was satisfactory for growth performance compared with the PC treatment groups. On the first trial, apparent total-tract P absorption and retention plateaued at 1200 U of AN phytase/kg of diet, with a reduction on fecal Ca and P of 22.4% and 28.6%, respectively, compared with the PC treatment group. Pigs fed the PC + 1200 U of AN phytase/kg absorbed and retained more P (g/d) than any other treatment group. On the second trial, apparent total-tract P absorption, bone strength and bone ash weight plateaued at 600 U of AN phytase/kg of diet, with fecal P excretion reduced 29.4% compared with the PC treatment group.

In both trials, the AN phytase treatments did not increase Ca, N, or energy absorption (amount/d or % of intake) and had no effect on serum Ca and P concentrations.

Veum, T.L. and Liu, J. 2018. The effect of microbial phytase supplementation of sorghum-canola meal diets with no added inorganic phosphorus on growth performance, apparent total-tract phosphorus, calcium, nitrogen and energy utilization, bone measurements, and serum variables of growing and finishing swine. Livestock Science. https://doi.org/10.1016/j.livsci.2018.05.017

Article Comments

This area is not intended to be a place to consult authors about their articles, but rather a place for open discussion among pig333.com users.
Leave a new Comment

Access restricted to 333 users. In order to post a comment you must be logged in.

Not a registered user of 333?sign upand access swine prices, the search engine, ...
It is fast and free
Are you registered in 333?LOGINIf you've forgotten your password we'll send it to you here

tags