Featured Research

from universities, journals, and other organizations

Helping pigs to digest phosphorus

Date:
July 17, 2012
Source:
University of Illinois College of Agricultural, Consumer and Environmental Sciences
Summary:
Research has determined how adding various levels of the enzyme phytase to the diet improves how pigs digest the phosphorus in four different feed ingredients. Improving phosphorus digestibility has positive implications for producers' bottom lines as well as for the environment.

Phosphorus is a vital nutrient for pig growth, but pigs do not always digest it well. Research conducted at the University of Illinois has determined how adding various levels of the enzyme phytase to the diet improves how pigs digest the phosphorus in four different feed ingredients. Improving phosphorus digestibility has positive implications for producers' bottom lines as well as for the environment.

Related Articles


"The majority of the phosphorus in plant feed ingredients is bound in phytate," said U of I animal sciences professor Hans Stein. "It is difficult for pigs to utilize that phosphorus because they cannot hydrolyze that phytate molecule. There is an exogenous enzyme called phytase that helps the pigs hydrolyze that phosphorus bond from phytate so the digestibility is increased."

However, there are no data on the response to different levels of phytase in the diet. "It's not known if we need to add 500, or 1,000, or 1,500 units of phytase to get a maximum response, and it's also not known if the response is the same when we use different feed ingredients," Stein said.

Stein's team tested the digestibility of phosphorus in conventional corn grain, corn germ, distillers dried grains with solubles (DDGS), and high-protein distillers dried grains (DDG). They tested each ingredient with no phytate and with 500 units, 1,000 units, and 1,500 units of added phytate.

Supplementation with 500, 1,000, and 1,500 units of phytate increased phosphorus digestibility from 40.9 percent in corn grain with no added phytate to 67.5, 64.5, and 74.9 percent, respectively. Phosphorus digestibility in corn germ increased from 40.7 percent to 59.0, 64.4, and 63.2 percent, respectively. Digestibility of phosphorus in DDGS increased from 76.9 percent to 82.9, 82.5, and 83.0 percent, respectively, but the increase was not significant. Phosphorus digestibility in high protein DDG increased from 77.1 percent to 88.0, 84.1, and 86.9 percent, respectively.

"What we discovered was that for corn and corn germ, we had a low digestibility without phytase, but as we added phytase to the diet, we increased the digestibility quite dramatically," Stein said.

For DDGS and high-protein DDG, the result was quite different. Because these two ingredients have been fermented, some of those phytate bonds are hydrolyzed in the ethanol plant and therefore, less of the phosphorus is bound to phytate in DDGS and high-protein DDG.

"When we added phytase to DDGS, we did not see a significant increase in digestibility because the digestibility was already very high. And the same was true for HP DDG," said Stein. "What this tells us is that the effect of phytase depends on the particular ingredient. If it's an ingredient that has a lot of phosphorus bound to phytate, we see a nice response, but if it doesn't have much phosphorus bound to phytate, we don't see nearly as much of a response."

The second finding was that the response to phytase is not linear. "The response to the initial 500 units of phytase is much greater than if we add another 500 units or another 500 units after that," said Stein. "It's a curvilinear response, even for the ingredients where a good response is obtained."

The researchers developed equations to predict the response to every level of phytase supplementation up to 1,500 units.

This research will help producers and feed companies to increase the digestibility of phosphorus in ingredients they are already feeding, thus avoiding the expense of adding dicalcium phosphate or monocalcium phosphate to swine diets.

"With current prices, it's less expensive to use phytase than it is to use dicalcium phosphate or monocalcium phosphate," Stein pointed out. Use of phytase to improve phosphorus digestibility also reduces the amount of phosphorus excreted in feces, which in turn reduces the environmental impact of swine production.

Stein's lab is continuing its research into phytase supplementation and is currently testing different sources of canola meal and soybean meal. He and his team plan to conduct similar research for all major feed ingredients used in U.S. swine diets.

The study was published in a recent issue of the Journal of Animal Science and was co-authored with doctoral candidate Ferdinando Almeida.


Story Source:

The above story is based on materials provided by University of Illinois College of Agricultural, Consumer and Environmental Sciences. The original article was written by Susan Jongeneel. Note: Materials may be edited for content and length.


Cite This Page:

University of Illinois College of Agricultural, Consumer and Environmental Sciences. "Helping pigs to digest phosphorus." ScienceDaily. ScienceDaily, 17 July 2012. <www.sciencedaily.com/releases/2012/07/120717122449.htm>.
University of Illinois College of Agricultural, Consumer and Environmental Sciences. (2012, July 17). Helping pigs to digest phosphorus. ScienceDaily. Retrieved November 27, 2014 from www.sciencedaily.com/releases/2012/07/120717122449.htm
University of Illinois College of Agricultural, Consumer and Environmental Sciences. "Helping pigs to digest phosphorus." ScienceDaily. www.sciencedaily.com/releases/2012/07/120717122449.htm (accessed November 27, 2014).

Share This


More From ScienceDaily



More Plants & Animals News

Thursday, November 27, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Classic Hollywood Memorabilia Goes Under the Hammer

Classic Hollywood Memorabilia Goes Under the Hammer

Reuters - Entertainment Video Online (Nov. 26, 2014) The iconic piano from "Casablanca" and the Cowardly Lion suit from "The Wizard of Oz" fetch millions at auction. Sara Hemrajani reports. Video provided by Reuters
Powered by NewsLook.com
Pet Dogs to Be Used in Anti-Ageing Trial

Pet Dogs to Be Used in Anti-Ageing Trial

Reuters - Innovations Video Online (Nov. 26, 2014) Researchers in the United States are preparing to discover whether a drug commonly used in human organ transplants can extend the lifespan and health quality of pet dogs. Video provided by Reuters
Powered by NewsLook.com
From Popcorn To Vending Snacks: FDA Ups Calorie Count Rules

From Popcorn To Vending Snacks: FDA Ups Calorie Count Rules

Newsy (Nov. 25, 2014) The US FDA is announcing new calorie rules on Tuesday that will require everywhere from theaters to vending machines to include calorie counts. Video provided by Newsy
Powered by NewsLook.com
Feast Your Eyes: Lamb Chop Sent Into Space from UK

Feast Your Eyes: Lamb Chop Sent Into Space from UK

Reuters - Light News Video Online (Nov. 25, 2014) Take a stab at this -- stunt video shows a lamb chop's journey from an east London restaurant over 30 kilometers into space. Rough Cut (no reporter narration). Video provided by Reuters
Powered by NewsLook.com

Search ScienceDaily

Number of stories in archives: 140,361

Find with keyword(s):
Enter a keyword or phrase to search ScienceDaily for related topics and research stories.

Save/Print:
Share:

Breaking News:

Strange & Offbeat Stories


Plants & Animals

Earth & Climate

Fossils & Ruins

In Other News

... from NewsDaily.com

Science News

Health News

Environment News

Technology News



Save/Print:
Share:

Free Subscriptions


Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

Get Social & Mobile


Keep up to date with the latest news from ScienceDaily via social networks and mobile apps:

Have Feedback?


Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?
Mobile: iPhone Android Web
Follow: Facebook Twitter Google+
Subscribe: RSS Feeds Email Newsletters
Latest Headlines Health & Medicine Mind & Brain Space & Time Matter & Energy Computers & Math Plants & Animals Earth & Climate Fossils & Ruins