INTRODUCTION:
According to FAOSTAT (2017), the number of goats worldwide in 2014 was 1,011,251,833 animals. The main countries that raised goats were mainland China (185,675,000), India (133,000,000), Nigeria (72,466,698), Pakistan (66,615), and Bangladesh (55,900,000). In Brazil, in 2014, the Municipal Livestock Research reported the existence of 8.851.879 goats and the Northeast region had the highest number of these animals, with 91.6% of the national goat herd (IBGE, 2014).
In Brazil, semiarid region represents 11.53% of its territory (IBGE, 2005), in which almost 60.0% of Northeast region is included (SUDENE, 2016) with hot and dry climate, low rainfall (range 280-800 millimeters), with irregular rains concentrated in three to four months, as well as water scarcity (ARAÚJO, 2011). Under these conditions, raising goats especially brought benefits to this region as low initial capital to start this activity, small scale accumulation of income and adaptation to semiarid regions agroecosystems (HOLANDA JUNIOR & MARTINS, 2007).
Meat goat have a life of six to seven years on-farm, being used while providing healthy offspring, and do not have dystocia or abortions (SEBRAE, 2000). It is recommended that reproductive life of these animals starts around seven to eight months (CODEVASF, 2011). In Brazil, goats are raised in three different systems: extensive, semi-intensive and intensive. In Northeast, the main form of raising goats is in extensive system (VOLTOLINI et al., 2011), in which animals are kept in rudimentary facilities, with sanitary management practices rarely used, and feeding on natural pastures, reflecting a low reproductive and high mortality rate. Productivity depends almost exclusively on weather conditions and soil fertility (CODEVASF, 2011). Semi-intensive system has a moderate use of technology, with supplemental feed and health management practices. The goals of intensive systems are higher productivity per animal or production per area available, with cultivation and fertilization of pastures, division of pastures in paddocks and breeding season being a frequent management practiced in this system (CODEVASF, 2011).
Studies have shown that it is possible to increase productivity and ensure animal welfare, being each society responsible for defining how animals are raised (MCINERNEY, 2004), and the demand for products that assure welfare of livestock has increased in recent years (BATTINI et al., 2014). In Brazil, consumers from Piracicaba-SP (88%) (DONOFRE et al., 2013), Rio Verde-GO (66.9%) (SCHALY et al., 2010) and São Luís-MA (63.9%) (ANUNCIAçAtilde;O et al., 2011) would accept paying a higher value for a product with welfare assurance of animals involved.
One way to assess animal welfare is through indicators. Farm animal welfare measures can be divided into behavioural, physiological, health (BROOM & FRASER, 2010) and zootechnical (APPLEBY et al., 2011). Behavioral measures can be assessed based on abnormal behavior; physiological parameters can be assessed by heart rate, respiratory rate and cortisol measurement; health indicators of the herd can be assessed by incidence and prevalence of diseases, and zootechnical indicators can be assessed by means of body condition score, mortality and birth rates.
In 2015, a protocol was released to assess welfare of lactating adult dairy goats in Europe, the AWIN Goat (Animal Welfare Indicators for Goats), with the goal of use indicators based mainly in animals and available resources to generate data that represent the quality of life in animals (AWIN, 2015a). Currently, there are no indicators to assess the degree of welfare in meat goat. Considering that Brazilian Northeast has the highest concentration of goat herd in Brazil, with specific weather and rainfall conditions, the aim of this review was to identify possible indicators to be applied in the welfare diagnosis of meat goat in this region.
Selection and types of indicators for welfare assessment in meat goat
Assessment of animal welfare requires the use of several indicators that address physical and mental health, besides natural behavior of each species (BLOKHUIS et al., 2010). Parameters for farm animals were defined by two protocols: Welfare Quality®, designed for pigs, poultry, dairy and beef cattle (WELFARE QUALITY®, 2009) and Animal Welfare Indicators (AWIN), created for sheep, dairy goats, horses, donkeys and turkeys (AWIN PROJECT, 2015). Welfare Quality® is defined by four principles and twelve criteria of welfare, with most of them also presented in AWIN protocols (WELFARE QUALITY® 2009; AWIN PROJECT, 2015). Each criterion has welfare indicators that can be observed in more than one principle. Table 1 shows welfare principles, criteria and indicators of AWIN Goat and Sheep (AWIN, 2015a; 2015b).
Table 1 Principles and criteria of welfare for sheep and goats, with respective indicators in each category, accordlying to AWIN Goat and Sheep (AWIN, 2015a, b).
Legend: aWIN Goat. bAWIN Sheep. abAWIN Goat and Sheep (AWIN, 2015a, b).
Parameters or indicators used by AWIN and Welfare Quality® protocols were selected based on validity, ensuring the degree of current animal welfare; confidence, being identified by different observers, regardless of external conditions such as time of day; and feasibility, which applies to farm level (WELFARE QUALITY, 2009; AWIN PROJECT, 2015). There are three types of indicators: animal-based, concerned about physical and mental health; natural behavior of species, concerned about the expression of social behaviors and absence of stereotypies; and resources and management-based, concerned about stocking density, housing conditions and health plans (BLOKHUIS et al., 2010). The last type is used as a questionnaire (WELFARE QUALITY, 2009; AWIN PROJECT, 2015).
In this review, indicators used to diagnose welfare in meat goat does were selected from AWIN Goats and AWIN Sheep protocols (AWIN, 2015a; 2015b). One parameter was suggested by the authors based on studies on health management and conditions of facilities for goats in Brazilian Northeast, in order to increase the level of welfare of these animals (SEBRAE, 2009; CODEVASF, 2011). Rearing systems, besides climate and rainfall characteristics of this region, were considered in the selection of indicators. Table 2 shows a proposal of animal and resources-based indicators to be tested on welfare assessment in meat goat does in Brazilian Northeast.
Table 2 Proposal of 18 indicators to apply in welfare assessment of goat does in different rearing systems.
Legend: aIndicators of AWIN Goat. bIndicators of AWIN Sheep. abIndicators of AWIN Goat and Sheep (AWIN, 2015a, b). cIndicator proposed by the authors.
Animal-based indicators
Body Condition Score (BCS): VILLAQUIRAN et al. (2004) reported that nutritional status of goats can be measured, subjectively, by palpation of the lower back and sternum, aiming to feel the amount of muscle and fat in these areas. Goats with high or low ECC may have systemic diseases and reproductive problems. In semiarid Brazilian Northeast, many animals are fed only with natural vegetation, even in the dry season (ARAÚJO FILHO, 2006), being supplemented when it is possible (HOLANDA JUNIOR & MARTINS, 2007).
Queuing at feeding: dairy goats on low-rank hierarchy were observed feeding in a smaller period and waiting in line for their turn to eat for a longer period when compared to goats in medium and high-rank hierarchy (JORGENSEN et al., 2007). These authors also reported that aggressive interactions increase significantly when the number of goats per trough is higher. Brazilian manuals recommend a space of 20 to 30cm per adult animal in the trough (EMBRAPA, 2005; SEBRAE, 2009; CODEVASF, 2011). Meanwhile, CODE OF WELFARE (2012) indicates a space of 40cm per adult as adequate. This indicator is important in confined systems and when goats have limited access to food.
Hair coat condition: this parameter may indicate the existence of pathologies or diseases on animals (BERG et al., 2009). Dairy goats with matted, rough and scurfy hair had lower ECC, deficiency or excess of minerals and increased presence of abnormal sounds in lungs compared to goats with shiny and homogeneous coat (BATTINI et al, 2015).
Thermal stress: normal respiratory rate in adult goats varies between 15 and 30 breaths per minute (bpm) (PUGH, 2002). Studies reported that thermal neutral zone for goats is between 20 and 30°C, with critical heat stress at temperatures above 34ºC (BAÊTA & SOUZA, 2010). Goats submitted to temperatures above 30ºC in Paraíba, Brazil, presented an increase in respiratory rate, rectal temperature and sweating rate, with reduction in food intake and water consumption (BRASIL et al., 2000).
Lameness: most reported lameness in goats occurs due to diseases in hooves caused by inadequate nutrition, environmental and anatomical factors (PUGH, 2002), and sickness such as Caprine Arthritis Encephalitis (CAE), sole ulcer, white line abscesses, sole abscesses and hoof overgrowth (NOGUEIRA et al., 2009; AGUIAR et al., 2011). ALENCAR et al. (2010) cited hooves problems in small ruminants, associated with lameness, possibly due to pododermatitis, in farms (n=63, 43.2%) located in Pernambuco, Brazil.
Abscesses: occurrence of external abscesses in the body, in the region of the lymph nodes, is closely associated with Caseous Lymphadenitis (CL) in small ruminants (SMITH & SHERMAN, 2009). In Pernambuco, 52,38% (n=44) goats had abscesses in lymph nodes suggestive of CL (SOUZA et al., 2014) and this disease was prevalent in farms (n=85, 66.9%) in Ceará, Brazil (PINHEIRO et al., 2000).
Body and head lesions: barbed wire and wood splinters were reported by stock people from Maranhão, Brazil, as causes of injuries in goats, and a gateway for ticks and subsequent myiasis (BRITO et al., 2005). In this study, tick larvae were reported in head, neck, belly and perianal region.
Leg injuries: occurrence of alopecia region, scabbed and swelling areas on the joints of legs in sheep may be indicative of injury, arthritis or animals lying on hard surfaces for a prolonged time (AWIN, 2015b), and can be also be presented in goats (PUGH, 2002). Also, in goats, arthritis is a symptom of CAE, especially observed in adults (NOGUEIRA et al., 2009).
Faecal soiling: this indicator measures presence of feces in anal region. Occurrence of diarrhea in goats is associated with copper deficiency, sudden change in diet, rumen acidosis, nematodes and cestodes infections (PUGH, 2002). Diarrhea caused by gastrointestinal worms was reported in farms (n=100, 78.7%) with goats in Ceará, Brazil (PINHEIRO et al., 2000).
Nasal discharge: dairy goats affected by tuberculosis, caused by Mycobacterium tuberculosis complex, showed bilateral nasal discharge (MELO et al., 2012.). Contagious caprine pleuropneumonia, Parainfluenza type 3, Oestrus ovis larvae, tumors, foreign bodies are other causes of this clinical signs in small ruminants (PUGH, 2002; RUFFIN, 2001). In Pernambuco, it was reported that in 63.3% of the farms (n=93) with small ruminants the animals had nasal discharge (ALENCAR et al., 2010).
Ocular discharge: this symptom is observed in bacterial infections such as infectious keratoconjunctivitis (RUFFIN, 2001) in goats. Keratoconjunctivitis was reported in farms (n=37, 29.1%) with goats in Ceará (PINHEIRO et al., 2000). Ocular changes suggestive of keratoconjunctivitis were also reported in farms (n=114, 77.6%) with small ruminants in Pernambuco (ALENCAR et al., 2010).
Oblivion: goats are gregarious animals and only isolate from the herd in moments before delivery (LICKLITER, 1985), or due to health problems, standing immobile and sometimes facing part of the housing structures, according to reports from farmers and technicians (BATTINI et al., 2014). Animals in this situation are usually isolated mental or physically, even during activities that should be synchronized (AWIN, 2015a).
Familiar human approach test: this test evaluates the level of fear in animals and is determined by previous human-animal interaction (MATTIELLO et al., 2010). Animal’s reaction, after a human being walking toward him, is measured (AWIN, 2015b). In dairy goats, it was used in animals in extensive system (MATIELLO et al., 2010). In meat goat, this test should be applied due to commonly less daily contact with humans when compared to dairy goats.
Qualitative Behaviour Assessment: this species-specific indicator seeks to identify animal emotions through it behavior expression and body posture (WEMELSFELDER et al., 2000). Descriptors as agitated, alert, bored, curious, relaxed were selected to add qualitative information to welfare diagnosis of dairy goats (AWIN, 2015a). Other descriptors can be studied and included as a way to make this indicator more representative to meat goat.
Resources-based indicators
Water availability: a constant supply of water for small ruminants is critical to regulating body temperature, especially in Brazilian Northeast semiarid (ARAÚJO et al., 2011). In addition, these authors reported that provision of water points and ease access to them are important factors, especially in dry periods. Water quality should be considered because contaminants such as bacteria, viruses and protozoa are transmitted to animals through this vehicle, being important to assess the cleanliness of water points (AWIN, 2015b).
Cleanliness of facilities: a study conducted in Brazilian Northeast reported that few producers (n=18, 14.4%) perform daily cleaning of facilities, being more common this practice be performed in periods longer than one week (n=86, 68.8%) (ALENCAR et al., 2010) or every 15 days (n=11, 61.1%) (FILGUEIRA et al., 2009). ALENCAR et al. (2010) reported that the most prevalent type of floor was bare soil (n=83, 74.8%), making it difficult to clean; however, producers performed it by sweeping and applying whitewash. This indicator is also important in extensive system because animals spent all night in facilities.
Stocking density: individual space is important in management of goats, particularly in intensive systems, because it reduces the frequency of aggressive interactions between animals (BARROSO et al., 2000). Brazilian manuals recommend the area of 1m2 per doe (EMBRAPA, 2005; SEBRAE, 2009; CODEVASF, 2011); however, this is in disagree with the CODE OF WELFARE (2012), which states that goats should have a space of 2m2 per animal when kept in stalls.
Access to shade and shelter: CODE OF WELFARE (2012) reported that goats kept on pasture, in absence of shadow, have higher water consumption, reduction of grazing behavior, increased respiratory rate, with mouth opening and tongue protrusion in extreme cases, indicating heat stress. Shelter is important to ensure that animals stay dry, out of the wet soil, and protected from wind. Animals allocated in hot and dusty environments are more prone to develop pneumonia, in absence of shadow.
Meat goat does and rearing systems in Brazilian Northeast were considered on the selection of these indicators to assess animal welfare. Most animal-based parameters were selected from AWIN Goat because this protocol was specifically developed for this species. Indicators such as “queuing at drinking”, “severe lameness”, “udder asymmetry”, “improper disbudding” were excluded because they are more directed to dairy goats in intensive and semi-intensive rearing systems (AWIN, 2015a). Inclusion of AWIN Sheep indicators, such as “lameness”, “body and head lesions”, “leg injuries,” “panting”, “familiar human approach test”, “water availability”, “access to shade and shelter”, “stocking density” (AWIN, 2015b) occurred because this protocol has been developed for different types of rearing systems, including extensive ones, which is more relevant to meat goats in Northeast of Brazil. A new indicator, “cleanliness of facilities”, was included because of its possible impact on animal health. Directed studies to prove validity, reliability and feasibility of these indicators in meat goat are needed. These indicators could also be used to diagnose welfare in bucks, but studies regarding their behavior and specific housing conditions are important to select the most relevant ones.
CONCLUSION:
Animal welfare needs to be included in goat breeding as a way to improve goats’ living conditions and the quality of products, being this already requested by external markets, as some countries in Europe. The selection of specific indicators to assess the welfare of meat goat is the first step to discuss the elaboration of a specific welfare protocol for goat in the semiarid region of Brazilian Northeast. Welfare assessments detect present problems in the animals’ life and can help in the search for improvements in the productive chain, being valuable to bring development to goat breeding in Brazilian Northeast. Along with the proposed indicators, others as presence of aggressive behavior, stereotypies, coughing and vulvar discharge could be included. The indicators proposed are feasible and must be tested in meat goat in the semiarid region of Brazilian Northeast to verify its validity and reliability and to generate studies to elaborate a specific welfare protocol for meat goats.
Email: [email protected]. * Corresponding author.
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Luana Oliveira Leite1
Fabiana de Orte Stamm1
Rita de Cassia Maria Garcia1
1Programa de Pós-graduação em Ciências Veterinárias, Setor de Ciências Agrárias, Universidade Federal do Paraná (UFPR), Rua dos Funcionários, 1540, 80035-050, Curitiba, PR, Brasil
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Abstract
In 2015, AWIN Goat Protocol was published in Europe, with indicators that identify welfare level of lactating dairy goats; however, there are no welfare protocols for meat goat. Therefore, the objective of this study was to select animal and resource-based indicators to assess welfare in meat goat in different types of grazing systems in Brazilian semiarid Northeast. Eighteen indicators were selected to evaluate the welfare of meat goat. The knowledge of the welfare degree of these animals is the best way to make improvements and promote a better quality of life to meat goat.