August 7, 2017 a very nice one-day meeting was held in Aarhus (DK) to discuss feather pecking in laying hens and tail biting in pigs. The meeting was a joint initiative of FareWellDock and GroupHouseNet. A Skype4business connection made it possible for about 10 external participants to join the meeting in addition to the 60 delegates present in person.
Opening of the meeting, introduction and networking session,
Anna Valros, Sandra Edwards
9:50-11:00 Theme 1: Mechanisms underlying the link between health and damaging behaviour
Invited speakers: Janicke Nordgreen (pigs), Jerine van der Eijk (poultry)
Mini research seminar
≥ Lisette van der Zande: The estimation of genetic effects of tail damage on weaned pigs and its influence on production traits
≥ Anja Brinch Riber: Link between feather pecking and keel bone damage
≥Mirjam Holinger: Does chronic intermittent stress increase tail and ear manipulation in pigs?
≥Laura Boyle: The effect of removing antibiotics from the diets of weaner pigs on performance of ear and tail biting behaviours and associated lesions
11:00-11:20 Coffee/tea break
11:20-12:20 Theme 1 continues: Group and plenary discussion, Anna Valros
12:20-13:20 Lunch break
13:20-14:30 Theme 2: Predisposing factors for damaging behaviour during early development
Invited speakers: Jo Edgar (poultry) and Armelle Prunier (pigs)
Mini research seminar
≥Ute Knierim: A tool to work on risk factors during rearing for feather pecking in laying hens
≥Elske de Haas, Margrethe Brantsæter & Fernanda Machado Tahamtani: Disrupting availability of floor substrate in the first weeks of life influences feather pecking during rearing and lay – a Dutch and Norwegian approach
≥Anouschka Middelkoop: Effect of early feeding on the behavioural development of piglets around weaning
≥Irene Camerlink: The crooked mind of the commercial pig: can we rectify abnormal biting behaviour by early and later life conditions?
14:30-14:50 Coffee/tea break
14:50-15:50 Theme 2 continues: Group and plenary discussion, Sandra Edwards
15:50 Closing of workshop
Some tweets from the workshop:
Acute lethal aggression is increasingly seen in commercial pig farming, as is excessive neonatal aggression (Irene Camerlink)
About 50 studies link (in-)adequate foraging to injurious feather pecking in poultry (Jo Edgar).
Maternal care strongly influences chick behavioural development (Jo Edgar)
Study: Lots of ear biting on Irish pig farms, up to 50% of pigs; Follow up: Antibiotic use may play a role (both causing & treating) (Laura Boyle).
Feather pecking appears to be linked to keel bone damage (Anja Brinch Riber).
Feather pecking is associated with elevated specific immune response (Jerine van der Eijk).
The tendency to reduce crude protein (CP) levels in pig diets to increase protein efficiency may increase the occurrence of damaging behaviours such as ear and tail biting, particularly for pigs kept under suboptimal health conditions. We studied, in a 2×2×2 factorial design, 576 tail-docked growing-finishing entire male pigs in 64 pens, subjected to low (LSC) vs. high sanitary conditions (HSC), and fed a normal CP (NP) vs. a low CP diet (LP, 80% of NP) ad libitum, with a basal amino acid (AA) profile or supplemented AA profile with extra threonine, tryptophan and methionine. The HSC pigs were vaccinated in the first nine weeks of life and received antibiotics at arrival at experimental farm at ten weeks, after which they were kept in a disinfected part of the farm with a strict hygiene protocol. The LSC pigs were kept on the same farm in non-disinfected pens to which manure from another pig farm was introduced fortnightly. At 15, 18, and 24 weeks of age, prevalence of tail and ear damage and of tail and ear wounds was scored. At 20 and 23 weeks of age, frequencies of biting behaviour and aggression were scored for 10×10 min per pen per week. The prevalence of ear damage during the finisher phase (47 vs. 32% of pigs, P < 0.0001) and the frequency of ear biting (1.3 vs. 1.2 times per hour, P = 0.03) were increased in LSC compared with HSC pigs. This effect on ear biting was diet dependent, however, the supplemented AA profile reduced ear biting only in LSC pigs by 18% (SC × AA profile, P < 0.01). The prevalence of tail wounds was lower for pigs in LSC (13 ± 0.02) than for pigs in HSC (0.22 ± 0.03) in the grower phase (P < 0.007). Regardless of AA profile or sanitary status, LP pigs showed more ear biting (+20%, P < 0.05), tail biting (+25%, P < 0.10), belly nosing (+152%, P < 0.01), other oral manipulation directed at pen mates (+13%, P < 0.05), and aggression (+30%, P < 0.01) than NP pigs, with no effect on ear or tail damage. In conclusion, both low sanitary conditions and a reduction of dietary protein increase the occurrence of damaging behaviours in pigs and therefore may negatively impact pig welfare. Attention should be paid to the impact of dietary nutrient composition on pig behaviour and welfare, particularly when pigs are kept under suboptimal (sanitary) conditions.
The Tail Biting “WebHAT” (Web based Husbandry Advisory Tool) is a website designed to be an interactive resource providing information about the key risks for tail biting in pigs and practical suggestions to help reduce these risks on-farm.
Taking information from evidence-based sources and scientific literature, this WebHAT identifies a number of risks associated with tail biting (a key pig behaviour), and can be used to generate a report of prioritised, key tail-biting risks found on a farm and obtain suggestions to address the specific risks identified
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….
Note: This article is an approved summary of the Executive Summary which was published earlier this year at http://farewelldock.eu. 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.
• 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.
Tail biting constitutes a major welfare and health issue in commercial pig rearing, with significant negative economic consequences. Contrary to the aim of the EU directive (2001/93/EC), tail docking is still widely practiced in most EU countries as a measure to reduce the incidence of tail biting and concomitant pathologies. Mutilations are a general welfare concern in all species, and any efforts towards reducing the need for tail docking are important for the future sustainability of the EU pig sector. Sound policy making needs science-based risk assessment, including assessment of the severity of problems and effectiveness of solutions. The general objectives of the FareWellDock-project included estimation of the relative harms associated with tail docking and tail biting, and evaluation of the efficacy of some main preventive measures against tail biting, which could reduce the need for tail docking. The ultimate aim was to stimulate the development towards a non-docking policy in the EU.
The first objective of WP1 was to evaluate measures of acute and chronic pain in relation to tail damage. This included assessment of the short (acute trauma), medium (post trauma inflammation) and long term (traumatic neuroma formation) pain associated with tail docking in neonatal piglets, and the possible consequences for longer term fear of humans. In addition, the studies assessed the effects of tail-damage in more mature pigs to provide a basis for assessing the pain associated with being tail bitten in later life. Finally, studies were conducted to assess the effects of an NSAID analgesic on the short term responses to neonatal tail docking.
Experimental studies confirmed that piglets do experience pain when tail docked, and that pain relief treatment, such as meloxicam, can lessen but not abolish the physiological stress reaction to docking. Piglets which have been tail docked seem more fearful of people afterwards than undocked animals. In docked tails, no difference in pain sensitivity of the tail (as measured by behavioural withdrawal) is detected after 8 weeks, but changes in the functioning of the sensory nerves from the tail can still be measured after 4 months, which suggests that the possibility for longer term pain exists. When the tail is damaged later in life, as happens with tail biting, changes in both tail stump sensitivity and nerve functioning can last for at least 4 months, and possibly beyond.
WP2 focused on the role of manipulable material when reducing the need for tail docking. The aim was to develop and validate ways to assess if on-farm use of manipulable material is sufficient to reduce tail biting. Further, the aim was to describe suitable methods for implementing the use of straw under commercial farming conditions and to investigate, in on-farm conditions, the efficiency of tail docking vs. enrichment given in sufficient quantity to reduce the occurrence of tail lesions.
A screening method to assess the appropriateness of the level of enrichment on-farm was developed and includes scoring of the amount of unsoiled straw, the behaviour, and ear, tail and flank lesions of the pigs. AMI (animal-material interaction) sensors were used e.g. to show that pigs in biter pens were more interested in novel ropes than pigs in control pens, that environmental enrichment may reduce exploratory behaviour of point-source objects, and that sick pigs, experimentally infected with streptococcus spp, were less interested in chain manipulation. The sensors appear to be a promising tool to assess the use of manipulable material by pigs. In countries (SE and FI) where tail docking is not done, farmers report using on average of 30 to 50 g of straw/pig/ day, equivalent to about 0.5 L/pig/day. A survey in SE revealed fewer injurious tail biting outbreaks on farms using larger amounts of straw. Larger amounts of straw were mainly used on farms having scrapers in the slurry channels. A large experimental study showed that a moderate amount of straw (150 gr/pig/day) reduced injurious tail-biting outbreak in finisher pigs by more than 50%, while docking seemed to be more effective as it reduced tail biting by more than four-fold. The effect of both measures was additive, i.e. docking and straw reduced tail biting 9 fold. Further, it was shown that increasing the amount of straw from 10 to up to 400 gr/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.
In WP3 the aim was to clarify the role of poor health in the causation of tail biting and victimization, and the aim was study early identification of tail-biting outbreaks. In addition, the aim to develop automated systems for early warning of tail biting outbreaks.
The results of experimental and on-farm studies showed that the social behaviour of sick pigs differs from healthy pen mates, as pigs with osteochondrosis received more sniffing and tail bites from their pen mates than healthy pigs, while pigs with mild respiratory disease tended to bite more at the ears and tails of pen mates than healthy pigs did. In addition, studies of cytokines suggest that low-grade inflammation may decrease activity and increase receiving sniffs and attacks from other pigs. Studies on data sets from commercial pig farms indicated that changes in feeding behaviour may be an important sign of an increased risk for tail biting to occur: Future tail bitten individuals showed a reduced feed intake already 2-3 weeks before tail damage became evident. Furthermore, feeding behaviour in groups which develop tail biting may differ from non-biting groups for at least ten weeks prior to an injurious tail-biting outbreak. It was also shown that tail-chewing activity may start 2-3 weeks before tail damage can be seen. A detailed behavioural study of tail biting events revealed that there appears to be no such thing as a ‘typical’ tail-biting event and that the behaviour shown immediately before a tail-biting event does not differ from behaviour prior to another type of social interaction, namely ano-genital sniffing. Thus, it seems difficult to predict if a social event will escalate into tail biting or not. However, tail biting is more likely between pigs that have previously interacted. Data sets from several countries and studies indicated an association between tail-biting damage and tear staining, but the direction of this association is not clear.
In summary the project concluded on a set of practical recommendations, which have been published as part of four factsheets on the FareWellDock-webpage:
Avoid tail docking whenever possible because it definitely causes pain, induces long-term changes in sensory-nerve function and may impair the pigs’ confidence in humans.
Avoid tail biting, and hence the need for tail docking, by addressing risk factors on the farm.
Treat tail-bitten pigs promptly and consider pain relief.
To reduce injurious tail-biting outbreaks, use straw as it might be almost as effective as tail docking. For this purpose, the more straw the better.
To ensure that sufficient straw is allocated check that there is left-over straw before the next day’s allocation.
Keep your pigs healthy. This will be good both for productivity and also help avoid injurious tail-biting outbreaks.
If pigs show signs of illness, be more alert to tail biting risk.
Remove tail-bitten pigs promptly to avoid further damage and treat according to veterinary advice.
Pay special attention to groups of pigs where you see:
high or suddenly increased levels of general activity or exploration
tail manipulation or chewing
swinging or tucked tails
low or decreasing numbers of visits to an automatic feeder or reduced feed intake
Information on project activities and publications have been continuously published on the FareWellDock-webpage. To date, 16 scientific articles have been published, and 9 are in preparation. Communication to stakeholders has been active, both through the FareWellDock-webpage, including 97 blog posts, and by interviews in media in different countries, popular articles and presentations at producer seminars. In October 2016 the results were presented widely at the EU level to policy makers and other stakeholders at the ‘Meeting and Webinar on Actions to Prevent Tail biting and Reduce Tail docking of Pigs’, organized by the European Commission Directorate General for Health and Food Safety in Grange, Ireland.
Due to the positive experience of the cooperation a decision was made at the last project meeting in DK in October 2016 that we will continue our cooperation as the FareWellDock-network, also inviting further researchers and stakeholders to join. The first activity of the FWD-network will be to organise a satellite meeting at the Congress of the International Society for Applied Ethology in August 2017 in DK, and to launch an emailing list to make sure FWD-network members and other researchers keep updated on research progress and related topics.
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).
From beak to tail – mechanisms underlying damaging behaviour in laying hens and pigs
First Announcement ISAE 2017 Satellite Meeting Monday 7th August 2017, University of Aarhus, Denmark
A one-day meeting, organized jointly by the FareWellDock – Network and the GroupHouseNet COST-action aims to bring together researchers working within the field of damaging behaviour in both pigs and poultry. By joining efforts on an interspecies level, we have the opportunity to greatly enhance the understanding of the mechanisms underlying tail biting and feather pecking. Both behaviours are challenging, from an animal welfare and from an economic point-of-view, while in several countries, as well as at the EU level, the ethical justification of tail docking and beak trimming is currently being debated.
This full-day meeting will be held at the ISAE 2017 congress venue on August 7th, 2017, starting at 9am.
The meeting will focus on the following main themes:
– Mechanisms underlying the link between health and damaging behaviour
– Predisposing factors for damaging behaviour during early development
Both themes will be introduced by invited experts, followed by short research presentations by participants, and then elaborated on in inter-species discussion groups.
In addition, the program will include a networking session, with the aim to facilitate knowledge exchange and future cooperation between researchers working on damaging behaviour in pigs and poultry.
The registration for the meeting will open by the end of February 2017, and will be open until May 15th, 2017. The meeting participation is limited to 80 persons, so make sure to register in time!
For further information, please contact anna . valros [AT] helsinki . fi.
In order to improve knowledge exchange across borders, the FLI is looking for further information about tail and ear biting projects in other countries. If you are or have been involved in such projects, please download the excel list, enter your data on the sheet “other countries” and send the updated file to Christina Veit (Christina . veit @ fli . de). In the near future it is planned to set up a public online database into which information from the Excel list will be transferred.
One of the outcomes from German research activities about tail biting is a scoring key for pigs agreed on by the various people involved across Germany: the DSBS. The scoring key for tail and ear lesions including pictures can be downloaded here (see screenshot below).