Navigation Links
Tryptophan-enriched diet reduces pig aggression
Date:3/18/2010

This release is available in Spanish.

Feeding the amino acid tryptophan to young female pigs as part of their regular diet makes them less aggressive and easier to manage, according to a study by Agricultural Research Service (ARS) scientists and cooperators.

The tryptophan-enhanced diet reduced aggression and overall behavioral activity among young female pigs during the 8-month study. Tryptophan, which is only acquired through diet, is the precursor for the calming cerebral neurotransmitter serotonin. Keeping swine calm is important, because aggressive behavior can harm them and increase feed and medical costs for producers.

The study was done by ARS doctoral student Rosangela Poletto and animal scientist Jeremy Marchant-Forde at the ARS Livestock Behavior Research Unit in West Lafayette, Ind. Collaborators included biologist Heng-Wei Cheng at the ARS lab in West Lafayette, and Purdue University scientists Robert L. Meisel and Brian T. Richert.

The supplemented diet raised blood concentrations of tryptophan in 3-month-old females by 180 percent, and by 85 percent in 6-month-old females, resulting in calmer animals, mainly at the younger age. Persistent aggression in pigs can cause chronic stress, leading to poorer welfare, increased disease susceptibility and reduced growth and efficiency.

In the study, a diet with 2.5 times the normal amount of tryptophan was fed for one week to grower pigs (3 months old) and finisher pigs (6 months old). Another group of pigs received a normal diet. Behavioral activity and aggressiveness were measured before and after the seven days of diet supplementation.

To test aggression, researchers put an "intruder" pig in the pen until an aggressive interaction was triggered or for a maximum of five minutes. Pigs receiving the high-tryptophan diet showed less aggressionfewer attacked the intruder, and those that did attack were slower to do socompared with the animals that didn't get the supplement.

Pigs form social groups that, over time, form stable hierarchies or "pecking orders." However, when new individuals are introduced, aggression is used to re-establish a new hierarchical order. If repeated changes in group composition occur, persistent aggression may arise, sometimes leading to physical injury and acute stress. A tryptophan-enriched diet may help producers avoid these problems, especially when groups of pigs are mixed together.


'/>"/>

Contact: Sharon Durham
Sharon.Durham@ars.usda.gov
301-504-1611
United States Department of Agriculture-Research, Education, and Economics
Source:Eurekalert

Related biology news :

1. Fireproofing homes dramatically reduces forest fire size, according to new study
2. Clinical studies show REMICADE reduces incidence of bowel surgeries in ulcerative colitis patients
3. Exercise improves thinking, reduces diabetes risk in overweight children
4. Manure management reduces levels of antibiotics and antibiotic resistance genes
5. Disrupting common parasites ability to talk to each other reduces infection
6. New study finds anticipating a laugh reduces our stress hormones
7. Mental stress reduces blood flow to the heart in patients with gene variation
8. Body image program reduces onset of obesity and eating disorders
9. Automated microfluidic device reduces time to screen small organisms for genetic studies
10. Newborn vitamin A reduces infant mortality
11. Compound that helps rice grow reduces nerve, vascular damage from diabetes
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:3/15/2016)... , March 15, 2016 ... report published by Transparency Market Research "Digital Door Lock Systems ... Forecast 2015 - 2023," the global digital door lock systems ... Mn in 2014 and is forecast to grow at a ... of micro, small and medium enterprises (MSMEs) across the world ...
(Date:3/14/2016)... HANOVER , Allemagne, March 14, 2016 /PRNewswire/ ... http://www.apimages.com ) - --> - ... ) - --> ... les solutions biométriques, fournit de nouveaux lecteurs d,empreintes ... lecteur LF10 de DERMALOG sera utilisé pour produire ...
(Date:3/10/2016)... PUNE, India , March 10, 2016 ... to a new market research report "Identity and Access ... SSO, & Audit, Compliance, and Governance), by Organization Size, ... Forecast to 2020", published by MarketsandMarkets, The market is ... to USD 12.78 Billion by 2020, at a Compound ...
Breaking Biology News(10 mins):
(Date:5/3/2016)... ... May 03, 2016 , ... ... of Dr. Nancy Gillett to its Board of Directors. Dr. Gillett recently retired ... Corporate Executive Vice President and Chief Scientific Officer. A board-certified veterinary pathologist, Dr. ...
(Date:5/3/2016)... 2016 - And Other Rising ... of Those Competitor Biologics  - Biosimilar Drug ... Prospects ,  Who are the most important ... are their sales potentials? Discover, in our updated survey, ... opportunities and revenue forecasting. Visiongain,s ...
(Date:5/3/2016)... ... May 03, 2016 , ... ... and IVF laboratories. A contingency of reproductive endocrinologists, including Dr. George Hill ... experiencing infertility and to help them build families. , Ovation Fertility is a ...
(Date:5/2/2016)... , ... May 02, 2016 , ... StarNet Communications Corp, ... announced the addition of three Secure Remote Desktop modules to its flagship X-Win32 PC ... from Linux and Unix servers to the user’s PC over encrypted SSH. , Traditionally, ...
Breaking Biology Technology: