The probiotic Enterococcus faecium modifies the intestinal morphometric parameters in weaning piglets
El probiótico Enterococcus faecium modifica los parámetros morfométricos intestinales en lechones destetados
DOI:
https://doi.org/10.15446/rfna.v69n1.54748Palabras clave:
Weaning, small intestine, piglets, probiotics, villi (en)Destete, Intestino delgado, Lechones, Probióticos, Vellosidades (es)
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DOI: https://doi.org/10.15446/rfna.v69n1.54748
The probiotic Enterococcus faecium modifies the intestinal morphometric parameters in weaning piglets
El probiótico Enterococcus faecium modifica los parámetros morfométricos intestinales en lechones destetados
Johana Andrea Ciro Galeano1; Albeiro López Herrera2 and Jaime Parra Suescún2
1 Fundación Universitaria Autónoma de las Américas. Carrera 28 No. 98-56, Pereira, Colombia. <johana.ciro@uam.edu.co>
2 Grupo BIOGEM - Facultad de Ciencias Agrarias - Universidad Nacional de Colombia. A.A. 1779, Medellín, Colombia.
Received: June 4, 2015; Accepted: July 20, 2015
This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.
ABSTRACT
Global trends for animal production have seen a decrease in the use of antimicrobial compounds in feed, generating the need to implement new nutritional strategies that stimulate growth and promote intestinal health. This study aimed to determine whether the addition of E. faecium in drinking water improves intestinal morphometric parameters in post- weaning pigs compared with the probiotics strains L. acidophilus and L. casei on days 1 (21 days of age), 15 and 30 postweaning. The small intestine was completely removed to evaluate the morphometric parameters (length and width of villi and crypts) in the different intestinal segments (duodenum, jejunum, and ileum). They were fed for 30 days with two diets: commercial diet with or without antibiotics. The different probiotics, L. acidophillus, L. casei and E. faecium, were administered in the drinking water of the animals that consumed the commercial diet without antibiotics. A randomized block design in split-plot arrangement was used. There was a significant increase (P<0.01) in the width and length of villi, and a decrease (P<0.01) in the values obtained for the width and depth of crypts in the animals that consumed E .faecium, as compared to those that consumed the diet with addition of antibiotics. The use of probiotics, especially E. faecium, is a nutritional treatment strategy when antimicrobial compound are used, improving the intestinal morphometric parameters and, at the same time, the digestive and productive parameters of the animals. Work is in progress to investigate the effects of probiotic supplementation on the mofication of gut microbiota of post-weaning piglets.
Key words: Weaning, small intestine, Piglets, Probiotics, Villi.
RESUMEN
Las tendencias mundiales en producción animal han llevado a disminuir el uso de compuestos antimicrobianos en la alimentación, generando la necesidad de implementar estrategias nutricionales que estimulen el crecimiento y promuevan la salud intestinal. Este estudio tuvo como objetivo determinar si la adición de E. faecium en el agua potable mejora parámetros morfométricos intestinal en cerdos de destete posteriores en comparación con las cepas de probióticos L. acidophilus y L. casei en los días 1 (21 días de edad), 15 y 30 posteriores destete. El intestino delgado se eliminó completamente para evaluar los parámetros morfométricos (longitud y anchura de las vellosidades y criptas) en los diferentes segmentos intestinales (duodeno, yeyuno, íleon). Los animales fueron alimentados con dos dietas: dieta comercial con y sin la adición de antibióticos. Los probióticos L. acidophillus, L. casei y E. faecium, se suministraron separadamente en el agua de bebida de los animales que consumieron la dieta comercial sin antibiótico. El diseño estadístico utilizado fue de bloques al azar en un arreglo de parcelas divididas. Se observó un aumento significativo (P<0.01) en ancho y altura de vellosidades, y una disminución (P<0.01) en los valores obtenidos para ancho y profundidad de criptas en los animales que consumieron E. faecium, frente a aquellos que consumieron la dieta con adición de antibiótico. El uso de probióticos, especialmente E. faecium se constituye en una estrategia terapéutica nutricional al uso de compuestos antimicrobianos, mejorando las características morfométricas intestinales de los animales.
Palabras claves: Destete, Intestino delgado, Lechones, Probióticos, Vellosidades.
In order to increase the performance reproductive sow, premature weaning of piglets has become common practice, generating stress and retarding the post-weaning growth of the pigs. The stress generated by separation from the mother, the abrupt change in food, the inclusion of raw vegetative material in the diet, and the poor development of the gastrointestinal tract in piglets result in a disruption of the mucosa integrity and a reduction in the digestion and absorption of nutrients at the intestinal level (Ciro et al., 2013). Furthermore, weaning modifies intestinal microbial population, characterized by a change and imbalance in the intestinal functions (Kang et al., 2010), which in turn generate economic losses in the swine industry (Reis et al., 2007; Campbell et al., 2013).
Before weaning, intestinal villi are long, well-structured, and very efficient in the absorption of nutrients due to the fact that intestinal glandular cells are able to replace the villi enterocytes as fast as they are lost (Gómez et al., 2008; Ciro et al., 2013). However, after weaning, the length of villi is reduced by almost half, causing the appearance of a higher proportion of immature and weak enterocytes at the extremes of the villi (Cabrera et al., 2013), resulting in cellular death, reduction in the surface area of the villi, imbalance in osmotic regulation, infiltration of the lamina propria by mononucleotide cells (Jacobi et al., 2013), and, therefore, a decrease in the nutrient absorption processes (Zhenfeng et al., 2008). Food that is not digested and absorbed by the small intestine remains available in the cecum and colon for microbial populations, generating intense activity and a proliferation of enteropathogens, specifically Enterotoxigenic E. coli (ETEC), salmonella spp., clostridium perfringes, and rotaviruses (lesser extent), which result in diarrhea (Lallès et al., 2004; Farzan et al., 2013).
In order to counteract the different enteric problems, feed supplementation with antimicrobial compounds is currently offered, which have been used in the swine industry as growth parameters and also as therapeutic y/o prophylactic treatments of gastrointestinal diseases in piglets (Kang et al., 2010). Currently, the trends in animal production patterns is promote the reduction and possible elimination of the inclusion of antimicrobial compounds without restrictions in feed through the implementation of diets with alternative approaches that stimulate growth and intestinal health (Kang et al., 2010), that decrease the generation of residues in the consumption product and of bacteria that are resistant to the antibiotics (Ghosh et al., 2013), and that do not harm human health (Zeyner and Boldt, 2006).
As a result, the use of Probiotics has been proposed as a nutritional treatment strategy, "live microorganisms that, when administered at suitable quantities, confer benefits to the health of the host." (FAO / OMS, 2006, DiRienzo, 2014). These microorganisms have created a close relationship between nutrition, microbiota, and health (Songisepp et al., 2012; Flesh et al., 2014; Mitsouka et al., 2014). In pigs, probiotics, such as E. faecium or B. cereus variant Toyoi, are commonly used, based on prior reports of positive effects against microbial infections (Bednorz, et al., 2013), E. faecium also changes the properties of absorption, secretion and transport of the intestinal barrier in piglets (Klingpor et al., 2013). For these reasons, this study aimed to determine whether the addition of E. faecium in drinking water improves intestinal morphometric parameters in post-weaning pigs compared with the probiotics strains L. acidophilus and L. casei.
MATERIALS AND METHODS
Ethical considerations
All experimental procedures were conducted according to guidelines suggested by "The International Guiding Principles for Biomedical Research Involving Animals" (CIOMS, 2012), and approved by the Ethics Committee on Animal Experimentation of Universidad Nacional de Colombia, Medellín (CEMED-03 of May 7, 2012).
Location
The fieldwork was conducted in the commercial farm "Caña Brava", and is located in the municipality of Gómez Plata with an altitude of 1,540 meters, and a temperature range of 18 to 22 °C, corresponding to a tropical lower-montane wet forest zone (bmh-MB).
Animals
Eighty duroc x pietrain cross piglets (male and female) weaned at 21 days of age and with an approximate weight of 6 ± 0.5 kg were used, which were separated into groups of 8 during the post-weaning period. Each of the corrals was provided with trough-type feeders, in a controlled temperature room (26 ± 3 °C). Water was provided ad libitum throughout the experiment. The provided commercial diet (pelleted feed) was enriched with vitamins, minerals, and lysine HCL. The diets were balanced in order to meet all of the minimal nutrition requirements and proposals from the NRC (2012) (Table 1). The quantity of feed offered to the piglets was administered in accordance with the dietary table that corresponded to the productive stage (growth). Additional feed was provided when required by the animals likewise, the drinking water that contained the probiotic strains was offered daily from day 1 of the weaning until the slaughter, which was carried out sequentially during the 30 days of the growth stage. No solid feed was provided to the piglets during the lactation.
Diets
The animals were fed with two diets: a commercial diet with and without the addition of antibiotics. The different probiotics strains (L. casei, L. acidophilus and E. faecium) were administered in the drinking water of the animals that consumed the commercial diet without antibiotics as follows:
Diet 1 Control (D1): Commercial feed without antibiotics, without supplementation with probiotic strains in the drinking water. Diet 2 (D2): Commercial feed with antibiotics (manufacturer's recommended dosage), without supplementation with probiotic strains in the drinking water. Diet 3 (D3): Commercial feed without antibiotics, with supplementation with the commercial probiotic strain L. acidophilus in the drinking water. Diet 4 (D4): Commercial feed without antibiotics, with supplementation with the commercial probiotic strain L. casei in the drinking water. Diet 5 (D5): Commercial feed without antibiotics, with supplementation with the commercial probiotic strain E. faecium in the drinking water.
The quantity of probiotics added was based on the instructions for their preparation and addition provided by the manufacturer's recommendations. The inclusion of the probiotics in the drinking water was carried out by directly mixing a liter of water with 30 g of commercial sugar, thereby guaranteeing minimal populations of 108 UFC with suitable viability, which was added in 50 L of water, and evaluated through microbiological analyses. The animals were receiving water without probiotics, were also added to a liter of water with 30 g of sugar. The feed used in this study was free of antibiotics (except the D2 diet) as the aim was not to modify the diet but to incorporate probiotics as an alternative to using antibiotics. The experiment diets were provided for 30 days starting at the day of weaning (age of 21 days).
Intestinal tissue sampling
During the experiment phase, euthanasia was carried out on the 35 piglets in the following manner: on the initial day, or day 1 (day of weaning), 5 piglets were slaughtered randomly, which represented the reference group in order to verify the general state of health and the macroscopic evaluation of the state of the organs of the animals before providing the experiment diets and the experiment units for each of the treatments; and day 15 and 30 post-weaning, 3 piglets were slaughtered randomly for each treatment, performing euthanasia to 30 piglets. All piglets were slaughtered 2.5 hours after their last feeding. The animals were sedated with the neuroleptic stresnil® (Azaperona) intramuscularly and were subsequently subjected to Nitrox® inhalation.
After the slaughter, the piglets were placed in a supine position, dissected in the abdominal region, and had their small intestine completely extracted, from the pyloric union to the ileocecal valve. Afterwards, the intestine was lined up on a table, measured without any tension, divided into three equally sized sections (duodenum, jejunum, and ileum) (Segalés and Domingo, 2003). The duodenum was the segment that started at the pylorus and terminated at the Treitz ligament; the jejunum was the proximal segment of the small intestine that continued along an angle and the ileum was the proximal segment (10 cm) before the ileocecal union. Approximately 1 cm of the transversal sections of the intestinal tissue was eliminated and 5 cm were taken from the start of each of the segments: duodenum, jejunum and ileum for each animal. The digesta contained in the samples was removed by a cold saline infusion wash as previously described (Reis et al., 2005; Ciro et al., 2013), and preserved in 10% buffered formalin and subsequently stored until performing laboratory determinations.
Morphometric analysis of the small intestine
Morphometry of the small intestine
Samples from three regions of the small intestine were processed and analyzed in the Laboratory of Animal Pathology at the Universidad de Antioquia for analysis by experts.
Histotechnological processing
The tissues were placed in 10% buffered formalin for 48 hours, embedded in paraffin, sliced in 4 µm thick cuts and stained with Hematoxylin-Eosin in order to be washed and stored in ethanol : water (75:25, v:v), in accordance with the method reported by Vente-Spreeuwenberg et al. (2003). These cuts were micro-dissected in order to determine the mean of the height and width of the intestinal villi, as well as the depth and width of the adjacent crypts. In each lamina three transverse cuts were mounted per slide.
Microscopic evaluation and morphometric analysis of images
The histological sections were analyzed quantitatively by computerized digital image processing, as follows: An optical microscope (Leica DMLB, Meyer Instruments, Houston, TX, USA) was used to identify tissue areas; then, the corresponding images were captured with a three megapixel 200X zoom camera for instant digital microscopy (Moticam 2300, Motic, Hong Kong, China). The images were analyzed with Motic Images Plus 2.0 image treatment software (Motic, Hong Kong, China).
The following morphometric variables were measured in each of the histological cuttings:
Intestinal villi
Height: once the villus based was established, a line was made from the mid-point to the apex.
Width: a line was made from the apical borders of the epithelial cells of opposite sides, located at approximately the middle of the villus.
The depth and width of the intestinal crypts were also determined, in accordance with the prior descriptions of Marion et al. (2002) and Vente-Spreeuwenberg et al. (2001).
Intestinal crypts
Depth: taken drawing a line or continuous segments from the opening to the base.
Width: with a line connecting the apical borders of the epithelial cells located on opposite sides at a mid-point level of the crypt.
The average value for each variable was calculated after performing measurements in eight villi and their corresponding intestinal crypts. Due to the fact that villus height may vary in each intestinal fold, being shorter at the apex, it was required that each region was equally represented in the assessment. In consequence, a circular fold of the mucosa was chosen, measuring two villous from the bottom, two on the right, two from the left side and two from the vertex. This procedure was repeated in each section of the small intestine (duodenum, jejunum and ileum) allowing to verify the effect of different diets on the villi according to their location. As far as we are aware, this analysis has not been performed previously.
Statistical design
The experiment was conducted as a randomized block design in divided parcels. The animals were blocked by initial weight. Each animal was assigned to one of 5 treatments (five experimental diets and three post-weaning periods), and each treatment had three repetitions Statistical data analysis was conducted using the General Linear Models procedure (GLM) of SAS program (2007). A Duncan test was used to compare treatment means (P<0.05).
RESULTS AND DISCUSSION
The pigs that consumed the experiment diets did not presented any signs of illness that would force their retirement or immediate slaughter. No food leftovers were observed during the experiment. .
In this experiment, no statistical interaction was observed between the different experiment diets and the weaning periods for any of the studied variables; therefore it was unnecessary to analyze those two factors independently.
The change in length and width defined between each of the diets and exposure periods villi can be seen in Table 2. With respect to the length and width of villi, showed a significant increase (P<0.01) between the different evaluated diets, where D1 obtained lower values compared to D2 and off the diet with probiotics, where animals in D5 reported higher values (Figure 1) for this intestinal variable . For intestinal segments there was significant statistical difference (P<0.01), where the duodenum showed higher values compared to the other two segments (jejunum and ileum) to villi length and width of. For the same variables under study, there was significant statistical difference between the different sampling days in each of the diets (P<0.05) and intestinal segment, where higher values occurred in the 30th.
For the depth and width defined between each of the diets and exposure periods crypts variable can be seen in Table 3. For these variables there was a significant (P <0.01) among the different diets evaluated, where D1 obtained higher values compared to D2 and facing diets with probiotics, where animals in D5 reported the lowest values for this intestinal variable. For intestinal segments there was significant statistical difference (P <0.01), where the duodenum showed lower values compared to the other two segments (jejunum and ileum) to crypt depth and width. For the same variables under study, there was significant statistical difference between the different sampling days in each of the diets (P <0.01) and intestinal segment where the lowest values were presented at the 30th.
The development of the small intestine in recently born piglets is accelerated for the first 10 days of life, a period in which the intestine is colonized with bacteria from the mother and the environment, resulting in a microbial composition and diversity that are unstable and highly influenced by the use of antibiotics, stress and nutrition (Schokker et al., 2014). Therefore, increases in weight, length, and diameter that are associated with increases in the height and diameter of the villi and in the cellular populations that form them (enterocytes) are significant (Reis de Souza et al., 2005).
Likewise, the villi at the beginning of life in piglets are elongated fingers in appearance, which swell over time, and, at 7-8 life weeks, acquire a tongue-like form (Müller et al., 2011). However, at weaning (approximately 21 to 28 days old), the length is reduced by almost half and the depth of the glandules is increased, with the appearance of more weak and immature enterocytes in the extremes of the villi, reducing their size (atrophy) (Parra et al., 2011) and their ability to digest and absorb nutrients (Fre et al., 2005; Suzuki et al., 2005; Ciro et al., 2013). For these reasons, the intestinal morphometric parameters of this study demonstrated a significant decrease in those animals that consumed the commercial diet with or without the addition of antibiotics as compared to the diets supplemented with probiotic strains. However, those animals that consumed the diet supplemented with antibiotics (D2), despite having high values, never exceeded the values obtained of the animals that consumed the diets supplemented with the probiotic strains (Figure 1), in agreement with the results of Sou (2012), who reported a morphological atrophy of the villi and hyperplasia of the crypts in animals that were weaned and provided a commercial diet (supplemented with antibiotics), while animals that consumed a diet supplemented with Lactobacillus plantarum exhibited the highest value for the villi height. This suggests that feed with lactic acid bacteria can help re-stabilize the equilibrium of the gastrointestinal tract in new born pigs and during the productive age (Kang, 2010).
There are various indicators that describe suitable intestinal functions, among which is the integrity of the villi, for which Siggers (2014) reported that, when providing swine colostrum with a combination of lactic acid bacteria (L. Plantarum, L. acidophillus, L. casei) to piglets, there was not significance in the variables of villi height or crypt depth, which suggests that the effect of probiotics favors intestinal integrity and digestive functions, as seen with sow colostrum, which upon contact with the microflora of the nipple, increases the concentration of lactic acid bacteria. Therefore, in our study, the animals that consumed the diets that were supplemented with probiotics not only demonstrated an increase in the height and width of the villi, but also a decrease in the depth and width of the crypts, as compared to the pigs that consumed the commercial diet with and without the addition of antibiotics.
Similarly, Wang (2013) reported that E. faecium not only improved the function of the intestinal barrier, but also, decreases the pathogenic bacteria colonization and infiltration by toxins, thereby preventing the characteristic diarrhea of the weaning period. Because of this, the animals fed D5 (E. faecium) in this study, reported improvements morphometric parameters, which could increase the capacity of the enzyme secretion and absorption in the duodenum and jejunum of pigs.
CONCLUSIONS
The use of probiotics, particularly E. faecium in animal nutrition in the growing period is an excellent nutritional alternative treatment strategy to the use of antimicrobial compounds because probiotics improve the intestinal morphometric parameters, and subsequently digestive and productive parameters of the animals. Therefore, the use of probiotics as additives in the production of balanced animal feed not only assures the optimal development and maintenance of the intestinal morphometric parameters in the intestinal architecture, such as the villi and crypts, but could also stimulates the immune response and the nutrient absorption. Work is in progress to investigate the effects of probiotic supplementation on the gut microbiota, and in turn improved the understanding of the mechanisms by which probiotics cause changes in the digestive physiology, and stimulation of the immune system and, in this way, to develop strategies provinding solution the enteric problems found in the critical post-weaning period.
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