Category Archives: Enrichment

Curly pig tail farming in Finland and Italy (two EC videos)

EU legislation on the welfare of pigs (Council Directive 2008/120/EC laying down minimum standards for the protection of pigs) does not allow routine tail-docking and requires farmers to provide to their pigs “manipulable material” such as straw, hay or sawdust.
To better inform farmers how to prevent routine tail docking, the Commission developed educational materials. The two videos present success stories in achieving the goal of rearing not-tailed pigs.

A Finnish farming with an intensive system rearing piglets with intact, curly tails.

An Italian farmer proud of rearing curly tails on straw

New book: Advances in Pig Welfare

New book: Advances in Pig Welfare
1st Edition
Editors: Marek Špinka
Hardcover ISBN: 9780081010129
Imprint: Woodhead Publishing (Elsevier)
Published Date: 10th November 2017
Page Count: 506

Table of Contents

Part One: Pig Welfare Hotspots
1. Overview of commercial pig production systems and their main welfare challenges* – Lene Juul Pedersen
2. Sow welfare in the farrowing crate and alternatives*
3. Piglet mortality and morbidity: inevitable or unacceptable?*
4. Lifetime consequences of the early physical and social environment of piglets* – Helena Telkänranta, Sandra Edwards
5. Tail biting* – Anna Valros
6. Manipulable materials* – Marc Bracke
7. Mitigating hunger in pregnant sows*
8. Aggression in group housed sows and fattening pigs
9. Handling and transport of pigs
10. Slaughter of pigs

Part Two: Pig Welfare Emerging Topics
11. The pain-sensitive pig* – Mette S Herskin, Pierpaolo Di Giminiani
12. On-farm and post-mortem pig health status assessment
13. Pig-human interactions: Pig-human interactions: creating a positive perception of humans to ensure pig welfare*
14. Breeding for pig welfare; opportunities and challenges*
15. Positive pig welfare
16. Pigs as laboratory animals* – Jeremy Marchant-Forde, Mette S. Herskin

Chapters marked with * have (co-)authors involved in FareWellDock. Chapters with stated authors only have FareWellDock partners as (co-)authors.


Advances in Pig Welfare analyzes current topical issues in the key areas of pig welfare assessment and improvement. With coverage of both recent developments and reviews of historical welfare issues, the volume provides a comprehensive survey of the field.
The book is divided into two sections. Part One opens with an overview of main welfare challenges in commercial pig production systems and then reviews pig welfare hot spots from birth to slaughter. Part Two highlights emerging topics in pig welfare, such as pain and health assessment, early socialization and environmental enrichment, pig-human interactions, breeding for welfare, positive pig welfare and pigs as laboratory animals.
This book is an essential part of the wider ranging series Advances in Farm Animal Welfare, with coverage of cattle, sheep, pigs and poultry.
With its expert editor and international team of contributors, Advances in Pig Welfare is a key reference tool for welfare research scientists and students, veterinarians involved in welfare assessment, and indeed anyone with a professional interest in the welfare of pig. View less >

Key Features
•Provides in-depth reviews of emerging topics, research, and applications in pig welfare
•Analyzes on-farm assessment of pig welfare, an extremely important marker for the monitoring of real welfare impacts of any changes in husbandry systems
•Edited by a leader in the field of pig welfare, with contributing experts from veterinary science, welfare academia, and practitioners in industry

Animal Welfare research scientists, Postgraduate students, Policy makers and stakeholders, R&D managers

The book may be ordered here.

Pig enrichment affects immune response to disease

Effect of enriched housing on levels of natural (auto-)antibodies in pigs co-infected with porcine reproductive and respiratory syndrome virus (PRRSV) and Actinobacillus pleuropneumoniae.
Lu Luo, Ingrid Daniëlle Ellen van Dixhoorn, Inonge Reimert, Bas Kemp, Jantina Elizabeth Bolhuis and Hendrik Karel Parmentier 2017. Vet Res (2017) 48:75.


Housing of pigs in barren, stimulus-poor housing conditions may influence their immune status, including antibody
responses to (auto-)antigens, and thus affect immune protection, which will influence the onset and outcome of
infection. In the present study, we investigated the effects of environmental enrichment versus barren housing on the
level of natural (auto-)antibodies (NA(A)b) and their isotypes (IgM and IgG) binding keyhole limpet hemocyanin (KLH),
myelin basic protein (MBP), and phosphorycholine conjugated to bovine serum albumin (PC-BSA) in pigs co-infected
with porcine reproductive and respiratory syndrome virus (PRRSV ) and Actinobacillus pleuropneumoniae (A. pleuro-pneumoniae). Pigs (n= 56) were housed in either barren or enriched pens from birth to 54 days of age. They were infected with PRRSV on 44 days of age, and with A. pleuropneumoniae 8 days later. Blood samples were taken on 7 dif-ferent sampling days. Housing significantly affected the overall serum levels of NA(A)b binding KLH, MBP and PC-BSA, and before infection barren housed pigs had significantly higher levels of NA(A)b than enriched housed pigs, except for KLH-IgM and PC-BSA-IgG. Infection only affected the IgM, but not the IgG isotype. Moreover, changes in MBP-IgM and PC-BSA-IgM following infection were different for enriched and barren housed pigs. These results suggest that the effect of infection on NA(A)b is influenced by housing conditions and that NA(A)b, especially IgM may be affected by infection.

Can enrichment help reduce tail docking?

In several episodes, leading welfare researchers explain the results they obtained within the international framework ‘FareWellDock’. This project investigates how to steer away from tail docking. Swedish and Danish researchers took a look at straw – does its use reduce the occurrence of tail biting?

Read more in Pig Progress.

From the article:
Tail docking is completely banned in Sweden, Finland and Switzerland.

Science suggests that lack of proper manipulable material is one of several major risk factors for tail biting.

A moderate amount of straw (150 g/pig/day) reduced the risk of injurious tail biting by more than two-fold, while docking seemed to be more effective as it reduced the risk by more than four-fold.

A combination of straw and increased space (1.2 m2 per pig) reduced the risk (of first occurrence) in undocked pigs to the same level as found in docked pigs kept under high stocking density (0.72 m2 per pig) without straw.

To provide a suitable outlet for exploratory behaviour under production conditions, materials have to be varied and complex, and are most effective when easily destroyed by chewing, or if they are edible.

Increasing the amount of straw from 10 to up to 400g/pig/day had multiple positive effects by progressively reducing the occurrence of tail injuries and stomach ulcers, increasing growth rate, increasing straw-directed behaviour, and reducing redirected behaviours towards other pigs.

Left-over straw may be a promising candidate method to screen for appropriate level of straw allocation.

Practical guide to enrichment for pigs

A Practical Guide to Environmental Enrichment for Pigs – A handbook for pig farmers. By AHDB Pork, UK

“This guide aims to give practical advice to pig farmers surrounding the complex
issue of providing suitable environmental enrichment to pigs. It provides
useful information from the knowledge of farmers, researchers and scientific
literature on the different ways environmental enrichment can be provided for
differing types of housing and systems. The information is set out in sections
by housing type, and in each, the types of enrichments that are most suited
to each system are discussed, including their properties, how to present
the enrichment, quantities and practical considerations, such as ease of
installation, maintenance and costs.” (cited from the introduction in the guide).


Is it possible to get rid of tail docking

Is it possible to get rid of tail docking? By Vincent ter Beek 2017. Article in PigProgress about FareWellDock.

Tail docking is a well-known practice in pig production, but it is also heavily criticised. An international team of researchers dived into the topic and wondered what its exact effects are on pigs – and what alternatives there are to avoid tail biting….

Read more @ PigProgress.

Note: This article is an approved summary of the Executive Summary which was published earlier this year at In future issues of Pig Progress, to be published later this year, several participating researchers in this project will delve deeper into the individual topics they encountered.

Enrichment may affect decision making in pigs

Effects of environmental enrichment on decision-making behavior in pigs
by F. Josef van der Staay, Johanna A. van Zutphen, Mirjam M. de Ridder, Rebecca E. Nordquist, 2017. Applied Animal Behaviour Science.


The animal’s emotional state, eventually modulated by environmental conditions, may affect cognitive processes such as interpretation, judgement and decision making behaviour. The Iowa Gambling Task (IGT) is a common method to examine decision making behavior in humans in terms of risk avoidance and risk taking that reflects the underlying emotional state of the subject. In the present study, we investigated the influence of environmental conditions on decision-making in pigs. To assess decision making behavior in pigs, the Pig Gambling task has been developed. In this task, the pig can choose between two alternatives. The pigs can make advantageous or disadvantageous choices, where advantageous, low risk choices deliver smaller, but more frequent rewards, whereas disadvantageous, high risk choices yield larger, but less frequent rewards. In the long run, over a series of successive trials, the advantageous choices will yield more reward and less punishment, where punishment consists of delivering reward into the central food trough, but making it inaccessible. After habituation to testing apparatus and testing methods during the course of approximately 4 weeks, all pigs learned to discriminate between the advantageous and disadvangeous alternatives (acquisition phase) at the age of 9 weeks. After a 14-week retention interval, at the age of 24 weeks, retention performance was tested (retention phase). In both phases, 20 trials per day were given to a total of 120 trials. Saliva and hair samples were collected once at the end of both phases for determining cortisol, and body mass was measured at the end of the retention phase. The pigs increased the number of advantageous choices during the course of training. In in the acquisition phase, barren-housed pigs chose the advantageous options more often compared to environmentally enriched pigs. No differences werer found during the retention phase. All pigs made less advantageous choices at the start of the retention phase than at the end of the acquisition phase. The level of hair cortisol was higher in the barren-housed than in the enriched-housed pigs. This difference was more pronounced after acquisition than after retention testing. No other differences were found for cortisol in saliva and hair. The environments did not differentially affect body mass at the end of the study. Summarizing, housing in a barren environment appears to be more stressful than housing in an enriched environment, as indicated by higher hair cortisol levels in barren-housed pigs, but it also improved acquisition of the PGT.

Enrichment for sows

Behavioral preference for different enrichment objects in a commercial sow herd
Kristina M. Horback, Meghann K. Pierdon, Thomas D. Parsons
Applied Animal Behaviour Science 184: 7–15


• Sows made contact with rope more frequently than rubber sticks or fixed woodblock.
• At any given time, more sows made contact with rope than the rubber or woodblock.
• Rope preference observed during day and night for two weeks.
• No difference in the lesion severity among the treatment pens.


Increased public concern about farm animal welfare is driving both legislative initiatives and market forces to change how sows are housed and managed. This study investigated the use and preference for enrichment items at a 5600 sows commercial sow farm in eastern USA. Gestating sows were housed in static, pre-implantation groups of approximately 75 sows per pen and fed via a single electronic sow feeding station. Each pen contained one of three enrichment objects (OBJ): hanging rope, hanging rubber sticks, and a fixed wood block. Behavioral data was collected from 18 pens during the course of this study on days 1, 3, 5 and 14 (DAY) that sows were in the pen, and at specific times on each day (TIME). For daytime activity, data was collected on-site in three 2-h blocks between 0800 and 1000, 1100–1300 and 1400–1600 for each pen and for nighttime data was collected on Day 1 in three 1-h blocks between 2200 and 2300, 0000-0100 and 0200-0300. Behaviors recorded included proportion of observation time animals interacted with the object, proportion of animals in pen that interacted with the object, and posture (up/down) of each animal in the pen. Lesion scores were recorded prior to mixing and two weeks post-mixing as a proxy for social aggression. The median proportion of observation time that the sows were in contact with the rope (62.4%) was significantly greater than (P < 0.01) the median proportion observed in the rubber pens (31.5%) and significantly greater than (P < 0.01) the median proportion observed in the woodblock pens (24.3%). Mixed design ANOVAs indicated a significant interaction of OBJ and DAY (P < 0.01) and OBJ and TIME (P < 0.01) on the proportion of observation time that the sows were in contact with the enrichment objects. Post-hoc analyses using Bonferroni correction showed that on each observation day and time period, the proportion of observation time that the sows were in contact with the enrichment was significantly greater (P < 0.01) in rope pens than rubber or woodblock pens. These results indicate that sows can exhibit clear preferences for enrichment type, with the sows interacting with the rope significantly more often throughout the study, at each sampling hour. However, there were no significant differences in lesion severity or sow activity between the three enrichment types, suggesting that common behavioral patterns including the establishment of social hierarchy took precedence over the pursuit of available enrichment. Additional studies are needed to understand how preferences for enrichment objects could be utilized to potentially impact sow productivity and welfare.

Factsheets FareWellDock project

The FareWellDock factsheets are out. Below you find the cover factsheet as well as the factsheets on tail docking, enrichment, health and the prediction of tail biting. This post shows images of the English versions, and  links to the pdf version of the English factsheets, as well as all factsheets in Danish, Dutch, Finnish, French, Italian, Norwegian and Swedish. Separate pages are available directly showing the factsheets in the other languages (Danish, Dutch, Finnish, French, Italian, Norwegian and Swedish).

Cover factsheet

Cover factsheet in English

Factsheet cover English (pdf)
Factsheet cover Danish (pdf)
Factsheet cover Dutch (pdf)
Factsheet cover Finnish (pdf)
Factsheet cover French (pdf)
Factsheet cover Italian (pdf)
Factsheet cover Norwegian (pdf)
Factsheet cover Swedish (pdf)

Tail docking

Factsheet 1 Tail docking English
Factsheet 1 Tail docking English (pdf)
Factsheet 1 Danish (pdf)
Factsheet 1 Dutch (pdf)
Factsheet 1 Finnish (pdf)
Factsheet 1 French (pdf)
Factsheet 1 Italian (pdf)
Factsheet 1 Norwegian
Factsheet 1 Swedish (pdf)


Factsheet 2 Enrichment English
Factsheet 2 Enrichment English (pdf)
Factsheet 2 Danish (pdf)
Factsheet 2 Dutch (pdf)
Factsheet 2 Finnish (pdf)
Factsheet 2 French (pdf)
Factsheet 2 Italian (pdf)
Factsheet 2 Norwegian (pdf)
Factsheet 2 Swedish (pdf)


Factsheet 3 Health English
Factsheet 3 Health English (pdf)
Factsheet 3 Danish (pdf)
Factsheet 3 Dutch (pdf)
Factsheet 3 Finnish (pdf)
Factsheet 3 French (pdf)
Factsheet 3 Italian (pdf)
Factsheet 3 Norwegian (pdf)
Factsheet 3 Swedish (pdf)

Prediction of tail biting

Factsheet 4 Prediction English

Factsheet 4 Prediction English (pdf)
Factsheet 4 Danish (pdf)
Factsheet 4 Dutch (pdf)
Factsheet 4 Finnish (pdf)
Factsheet 4 French (pdf)
Factsheet 4 Italian (pdf)
Factsheet 4 Norwegian (pdf)
Factsheet 4 Swedish (pdf)

Ice blocks may vaccinate and enrich gestating sow welfare

An investigation of sow interaction with ice blocks on a farm with group-housed sows fed by electronic sow feeders

By M.K. Pierdon, A.M. John and T.D. Parsons. in: Journal of Swine Health and Production 24(6):309-314 · November 2016


More gestating sows are being housed in pens where it is challenging to implement controlled exposure to pathogens for disease control (“feedback”). Ice blocks provide a possible vehicle for feedback material in pen gestation. Ice blocks were placed once weekly for 6 consecutive weeks in a pen of approximately 130 sows to test whether sows would interact with the blocks of ice. Sows were housed in a large, dynamic pre-implantation group fed with electronic sow feeders. Each ice block was video-recorded for 1 hour. All sows that contacted it were identified. The number of sows, their duration of contact, and amount of aggression were coded from the video. Median number of sows that interacted with the ice was 94, and increasing the number of ice blocks from two to four per pen increased the median number of sows to contact the ice and the median duration of an individual sow’s contact with the ice, and decreased the amount of aggression at each block. Our findings suggest ice blocks are a convenient vehicle for controlled exposure of feedback material to gestating sows housed in large pens. However, additional studies are needed to validate pathogen exposure with this method.