1. Introduction

OJAS

Open Journal of Animal Sciences

2161-7597

Scientific Research Publishing

10.4236/ojas.2017.72017

OJAS-75854

Articles

Biomedical&Life Sciences

Safety Evaluation of a Standardized Macleaya cordata Extract in a Ninety Day Feeding Study in Weaned Piglets

Zhao

¹Sophie

von Alvensleben

²Giorgio

Fusconi

³Mauro

Morlacchini

Phytobiotics, Futterzusatzstoffe GmbH, Eltville, Germany

Burdock Group, Orlando, FL, USA

CERZOO Srl, Piacenza, Italy

10042017

0702213231March 31, 2017Accepted: April 27, April 30, 2017

2014

This work is licensed under the Creative Commons Attribution International License (CC BY). http://creativecommons.org/licenses/by/4.0/

The aim of this study was to assess the effects of Sangrovit &reg , a standardized preparation of Macleaya cordata extract (MCE), on the health status and performance in weaned piglets. A total of 128 weaned piglets were randomly divided into four groups ( n = 32, 16/sex/group) and fed either a control feed (T1) or the control feed supplemented with 100 mg/kg (T2), 500 mg/kg (T3), or 1000 mg/kg (T4) Sangrovit &reg (resulting in 0, 3.5, 17.5, 35 mg MCE/kg feed, respectively) for ninety days. The parameters for growth and health status were evaluated during the trial and blood was collected on Day 0 and Day 91 for hematology and biochemistry analysis. After the animals were sacrificed, the weight of the major organs and tissues was measured and histopathological examination on the organs from 8 animals in each group (4/sex/group) was performed. The results showed no statistically significant differences in live weight, feed intake, and average daily weight gain between the treatment and control groups. The feed containing 100, 500, or 1000 mg/kg Sangrovit &reg was well tolerated by piglets, with no adverse effects noted during the feeding period or in the histopathological results. The majority of the hematological and blood biochemistry parameters displayed no significant changes between the control and treatment groups. Compared to the control group, some hematological parameters including MCV, platelets concentration, and APTT were modified in some but not all treatment groups. Some significant changes in the blood biochemistry parameters were found in the treatment groups including levels in bile acid, haptoglobin, total serum protein, and GTT, as well as creatine kinase activity, but those changes were not toxicologically significant because no observed changes were seen in other similar biomarkers. In sum, this study demonstrated that the addition of Sangrovit &reg to swine feed at up to 1000 mg/kg does not result in any toxicological effects to the health status and growth of weaned piglets.

Macleaya cordata Piglets Sanguinarine Tolerance

1. Introduction

Macleaya cordata (M. cordata) is a deciduous perennial plant found across North America, Eastern Asia, and European countries. It is hollow-stemmed, leafy and fast growing and can grow to 2.0 meters high [1] . Previous studies have shown that the aerial parts of M. cordata contain a variety of quaternary benzophenanthridine alkaloids (QBAs) that display multiple biological activities. Isolation of QBA, though in impure form, was first reported in the first half of the 19th century. Other forms of QBA have been discovered since then and in the mid-1980s approximately 80 naturally occurring compounds of this type were reported [2] . Long before pure alkaloids were isolated, plants of the Papaveraceae family containing QBAs such as sanguinarine and chelerythrine, including the plant Sanguinaria canadensis (blood root) that contains 4% - 7% QBA in rhizome and 1.8% in roots, Chelidonium majus (celandine) that contains 4.5% QBA in roots, and M. cordata that contains 3% QBA in aerial parts, were utilized in traditional medicine in North America, Europe and China for analgesic, antiedemic, carminative, depurative, and diuretic properties [3] .

Among the alkaloid varieties, sanguinarine and chelerythrine are colorless and crystalline substances that have been well investigated for their unique properties [1] [4] . Sanguinarine and chelerythrine are bitter in taste and products containing these substances have been used as natural appetizing agents to feed farm animals, such as swine [3] , bovines [5] , poultry [6] and fish [7] . Swine (Sus scrofa domesticus L.) is one of the most important commercial livestock species that provides more than one third of the meat production in the world [8] . Previous studies have found that the bitter taste is a part of the swine taste receptor system [9] and QBAs from M. cordata have been identified as flavoring compounds [10] which could potentially improve palatability of animal feed like some other phytogenic compounds [11] . In this study, M. cordata extract (MCE), a bitter tasting substance, is proposed to provide a consistent taste to the feed, and to mask subtle changes that may affect feed intake of piglets.

MCE has been included in the European Feed Additive Register and approved for use as a flavoring compound for farm animals. Sangrovit® is a standardized preparation of MCE, manufactured by an ethanol-based extraction of the aerial portions of the M. cordata plant, which contains 3.5% MCE (providing 1.5% sanguinarine). The recommended use rate for Sangrovit® to be added to premixes or to compound feed is 15 - 100 mg/kg in feed. Dietary supplementation with Sangrovit® has been demonstrated to elevate daily body weight gain and feed conversion ratio in chickens [12] [13] and optimize the nitrogen utilization and feed digestion in bovine [5] [14] . In swine, Sangrovit® has been evaluated for its effects on stress response and pathogen shedding in finishing pigs [15] and effects on the growth parameters in weaning piglets [3] . However, few studies have been conducted to assess the safety of MCE consumption in weaned piglets. The objective of this study was to determine the tolerability and health status of consumption of Sangrovit®, a standardized preparation of MCE that contains sanguinarine and chelerythrine as major active components, for 90 days by weaned piglets at the levels of 100, 500, 1000 mg Sangrovit®/kg feed.

2. Materials and Methods2.1. Test Substance

A manufactured preparation of MCE, under the trade name of Sangrovit®, was provided by Phytobiotics Futterzusatzstoffe GmbH (Eltville, Germany) and used as the test substance for all the experiments in this study. The Sangrovit® preparation was a reddish-orange-green colored granula that was standardized to contain at least 1.5% sanguinarine resulting in about 3.5% MCE. The level of sanguinarine and chelerythrine in Sangrovit® in the feed were measured by validated methods as previously described [12] . No microbiological contamination such as Salmonella was detected after analysis, and heavy metal content was within limits set in the legislation of the European Union (Arsenic: <2 mg/kg; Mercury: <0.1 mg/kg; Cadmium: <1 mg/kg; Lead: <10 mg/kg).

2.2. Experimental Animals and Diets

This trial was carried out on 128 hybrid piglets (64 females and 64 castrated males; Bompieri × Goland genetic line that is a Large White × Duroc cross; sire line was the hybrid boar of the Bompieri line), weaned at approximately 28 days of age. The breeding farm code was 125 BS 001/6 and the farm was located in Pontevico (BS), Italy. The study was conducted in two compartments, i.e., weaning rooms and growing rooms, depending on the growth phase and weight of the animals at the CERZOO S.r.l. facility (Piacenza, Italy). The conditions were regarded as representative for a modern commercial operation in Europe. The total treatment duration was 90 days, plus an acclimatization period of 7 days before the study started. After the acclimatization period, the animals were weighed, selected for healthy individuals, and assigned to the control and treatment groups to achieve maximum possible homogeneity within each group and minimize differences between the groups. An average of live weight (LW) was 7.83 (±0.89) kg when piglets entered the study on Day 0 (D0). Four piglets of the same gender were housed in one cage, with eight cages per treatment group (i.e., 16 castrated males and 16 females/group). For the first 42 days (D0 - D41) of the study, the animals were housed in the weaning rooms in flat-deck cages. For the remaining 48 days (D42 - D90) of the study, the animals were housed in the growing room on a slatted floor. The trial facility was equipped with a dynamic ventilation system that enabled the facility to control the ventilation rate according to the temperature and age of the pigs. The temperature (27.1˚C ± 1.0˚C) and relative humidity (62.4% ± 8.6%) in the weaning room and growing room were recorded every 30 min. The temperature was automatically adjusted as necessary. Natural daylight was utilized as a light source during the whole trial period.

The weaned piglets were fed with typical corn-soybean meal-based basal diets in dry powder form, the compositions of which were changed to meet or exceed the nutrient requirements recommended for piglets in different growth stages (NRC 2012). The basal diets for three different experimental periods (one for each experimental period: D0 to D21, D21 to D42, D42 to D90) were prepared by Ferraroni S.r.l. Feed Mill (Bonemerse, CR, Italy) and formulated without antibiotics, antibiotic growth promoters (AGP), or AGP alternatives (Table 1). The experimental diets (T1, T2, T3, and T4 diets) for each growth period were prepared by mixing 0, 100, 500, or 1000 mg Sangrovit®/kg feed using the basal diets, and were mixed at the CERZOO Feed Mill (Piacenza, Italy); homogenous distribution of Sangrovit® was ensured by dietary analysis. Both control and test diets were analyzed for moisture, ash, starch, crude protein, crude fat and fiber, as well as the content of sanguinarine and chelerythrine. The sanguinarine and chelerythrine contents in the basal (T1) diet were under the analytical detection limit (<0.01 mg/kg diet). The treatment diets were found to contain 1.68 - 1.75 mg sanguinarine and 0.55 - 0.65 mg chelerythrine per kg T2 diet, 8.42 - 8.60 mg sanguinarine and 2.75 - 3.27 mg chelerythrine per kg T3 diet, and 16.64 - 17.01 mg sanguinarine and 5.52 - 6.83 mg chelerythrine per kg T4 diet (Table 1). During the trial period, the animals were fed ad libitum using one steel feeder per cage. The drinking water was provided ad libitum by an internal water system in which the water quality was analyzed annually. Feed intakes were measured and recorded per cage on Day 0, 21, 42, and 90.

2.3. Study Design

Piglets were divided into four groups with equal sex distribution in each group. The minimum sample size to pick up differences in 1 kg live weight between each treatment was calculated and a sufficient sample size of n = 32 was utilized for each group (16 castrated males and 16 females/group). The animals were fed with either a control diet (T1) or one of the three treatment diets supplemented with 100 (T2), 500 (T3) and 1000 (T4) mg Sangrovit®/kg feed for ninety days. Daily inspections were carried out by qualified personnel while periodic inspections were made during the study by veterinarians and responsible staff of animal welfare. Individual LW of the piglets was recorded on Day 0, 21, 42 and 90. Average daily feed intake (ADFI) by cage was determined by the difference between the feed offered and the feed refused and calculated back for each growing period (i.e., Day 0 - 21, Day 21 - 42, Day 42 - 90) and for the complete study period (Day 0 - Day 90). Similarly, average daily gain (ADG), and feed: gain ratio (F:G) per cage were calculated by different growth periods. Blood samples were collected on D0 and D91 for hematology and biochemistry analysis. At the end of the study (D91), one animal of each cage (32 in total: 4 castrated males and 4 females for each treatment) was slaughtered, and the carcass was subjected to detailed gross necropsy. During necropsy, organs and tissue samples from all

Table 1 Composition and analytical characteristics (as feed) of the basal diets in the 3 growing periods

Ingredient (%)	First Experimental Period (D0 - D21)³	Second Experimental Period (D21 - D42)³	Third Experimental Period (D42 - D90)³
Corn meal	41.00	46.75	59.48
Soybean meal 44%	35.27	30.40	21.50
Wheat meal	6.00	6.00	10.00
Milk whey	6.00	6.00	-
Oil of plant origin	3.90	3.50	2.20
Wheat bran	3.00	3.00	3.00
Monocalcium phosphate	1.10	1.00	1.00
Limestone	1.25	1.10	1.20
Salt	0.30	0.20	0.20
Sodium bicarbonate	0.80	0.80	0.40
L-Lysine HCl 98%	0.60	0.60	0.44
DL-methionine	0.25	0.20	0.15
L-Threonine	0.23	0.18	0.16
L-Tryptophan	0.05	0.02	0.02
Vitamins and minerals	0.25	0.25	0.25
Analytical characteristics (%)
Dry matter	90.5	90.05	89.41
Crude protein	20.80	18.59	16.56
Crude fat	6.40	5.36	5.27
Crude fiber	3.84	4.65	3.07
Ash	6.40	5.96	4.60
Starch	33.15	38.87	46.15
DE, kcal/kg¹	3277	3262	3506
NE, kcal/kg²	2782	2781	2808
Sanguinarine in the diet (mg/kg)
T1	<0.01	<0.01	<0.01⁴
T2	1.71 ± 0.08	1.75 ± 0.03	1.69 ± 0.05⁴
T3	8.47 ± 0.13	8.85 ± 0.46	8.60 ± 0.38⁴
T4	16.71 ± 0.58	17.17 ± 0.60	17.01 ± 0.31⁴
Chelerythrine in the diet (mg/kg)
T1	<0.01	<0.01	<0.01⁴
T2	0.55 ± 0.03	0.64 ± 0.01	0.65 ± 0.16⁴
T3	2.75 ± 0.04	3.27 ± 0.15	3.24 ± 0.12⁴
T4	5.52 ± 0.18	6.83 ± 0.18	6.33 ± 0.16⁴

¹DE = Digestible energy, was calculated according to the equation of Noblet and Perez [30] . ²NE = Net energy, was calculated according to the equation of Noblet et al. [31] . ³There are no statistically difference in basal ingredient composition between control and treatment diets in 3 growing periods. The mean values of composition for the basal ingredient (expect sanguinarine and chelerythrine) in T1 diets were used and represented the basal composition for all the treatment groups. ⁴The data was obtained from first batch manufactured. The data from second batch were similar (not shown).

groups (T1, T2, T3, and T4) were preserved for histopathology evaluation. This study was conducted in full compliance with Good Laboratory Practice (GLP) guidelines under Italian Legislation (Directives 2004/9/CE and 2004/10/CE, according to Italian Legislation D.L. March 2, 2007, n.50).

2.4. Diarrhea Scoring

General health status of the animals was checked twice daily. Subjective diarrhea scores were recorded daily. Diarrhea scores on cage basis were determined based on the performance of individual pigs and signs of stool consistency in the cage, ranging from 1 - 3 (1 = well-formed feces; 2 = sloppy feces; 3 = diarrhea) [16] [17] .

2.5. Blood Biochemistry and Hematological Analysis

Blood collections were conducted at the beginning and the end of the trial. On Day 0 (before the trial started), blood was collected from 20 randomly-selected piglets (10 females and 10 castrated males). On Day 91, blood was collected from one randomly selected animal from each cage (32 piglets in total, 4 females and 4 castrated males for each treatment). Blood samples were drawn by aorta vein puncture using disposable Becton Dickinson Acute Care (U.S.A.) syringes and collected into three types of 10 ml vacuum tubes: 1) containing lithium heparin as anticoagulant; 2) containing sodium citrate as anticoagulant; and 3) containing no anticoagulant. The samples were immediately dispatched to the laboratory for analysis at 4˚C. The blood samples treated with lithium heparin were used as whole blood to measure the hematological parameters including erythrocytes (RBCs) total counts, leukocytes (WBC) total and differential counts, packed cell volume (PCV), mean corpuscular volume (MCV), mean corpuscular hemoglobin (MCH) and mean corpuscular hemoglobin concentration (MCHC), platelet count, red blood cell distribution width (RDW). Plasma was obtained by centrifuging the blood samples treated with sodium citrate at 3500 rpm for 10 min at 4˚C and used to analyze for fibrinogen, prothrombin time, and activated partial thromboplastin time. Serum was obtained by clotting the blood sample at room temperature and centrifuging the blood samples without anticoagulant treatment at 3500 rpm for 10 min at 4˚C and were used to analyze the biochemical parameters, including sodium, urea nitrogen, potassium, creatinine, chloride, alanine aminotransferase (GPT/ALT), calcium, aspartate aminotransferase (GOT/AST), phosphate, lactate dehydrogenase (LDH), magnesium, gamma- glutamyltransferase (GGT), total protein, alkaline phosphatase (AP), albumin, creatine kinase (CK), globulin, total bile acids, glucose, cholesterol, amylase, acute phase protein (haptoglobin, and ceruloplasmin) and the four categories of globulin (α1, α2, β, and γ globulin). Blood biochemistry and hematological analyses were performed by La Fontana laboratory (Piacenza, Italy) which was certified with ISO 90001-2008 (certificate n. 18734/08/S).

2.6. Veterinary Necropsy and Histopathology Examination

At the end of the study (Day 91), 32 experimental animals (8 animals/treatment; the same animals used for the blood collection) were necropsied by a veterinary surgeon at CERZOO. A gross examination was carried out on the organs and tissues, which included a gross check on: pituitary gland, brain, bone and marrow, kidneys, thyroid gland, spinal cord, marrow smear, caecum, eyes, spleen, urinary bladder, adrenal gland, lung, stomach, thymus, pancreas, muscle, duodenum, heart, ovaries (for females), mammary gland (for female), jejunum, lymph nodes, uterus (for female), liver, ileum, skin, gall bladder, colon. The organs and tissues of 16 animals (8 animals (4 animals/sex) from T1 group, 8 animals (4 animals/sex) from T4 group) were collected and examined for histopathology by the designated veterinarian for animal welfare. The histopathological examination covered the organs and tissues that include: adrenal glands, aorta, bone (sternum, femur including articular surface), bone marrow (sternum, femur), brain (including sections of forebrain, upper brain stem, mid brain, medulla oblongata, pons, cerebral and cerebellar cortex), esophagus, eyes with retina and optic nerve, female and male mammary gland area, gallbladder, heart, kidneys, lacrimal gland, larynx, liver, lungs, lymph nodes (retropharyngeal, mesenteric), nasal cavity (including turbinates and paranasal sinuses), nictitating gland (for Harderian gland), olfactory bulb, oro-nasal pharynx (adjacent to hard palate), ovaries (female only), oviducts, pancreas, Peyer’s patches, pituitary gland, salivary glands, sciatic nerve, skeletal muscle, skin and subcutaneous tissue, small intestine (duodenum, jejunum, ileum), spinal cord (cervical (C1), mid-thoracic (T7), and lumbar (L7) segments including roots and dorsal root ganglia at lumbar level), spleen, stomach, thymus, thyroid gland, tongue, trachea, ureter, urethra, urinary bladder, uterus with cervix, vagina (for female). The samples were fixed in 10% buffered formalin or in modified Davidson’s solution depending the type of organs and tissues sampled. The slide preparation and histopathology were conducted by AnaPath GmbH laboratory (Oberbuchsiten, Switzerland) in compliance with the Swiss Ordinance related to Good Laboratory Practice [SR 813.112.1]. Histological sections of tissues were trimmed, embedded, sectioned, stained with hematoxylin and eosin (further stains if needed), and examined by the study pathologist. To elucidate the nature of an individual animal’s tissue changes, tissue sectioning, staining and microscopic examination was conducted as requested by the study pathologist.

2.7. Statistical Analysis

Data obtained in this experiment were analyzed by using the software program of SAS 2002-2010, Release 9.3 (Cary, NC, USA) under the General Linear Model (GLM) procedure. Analysis of Variance (ANOVA) was used as the main statistical test and the Student’s t and Tukey’s tests were used to compare the means from each group. Treatment effect for animals in both sex and treatment × sex interaction were calculated by ANOVA. A statistical analysis by each sex were also conducted. P ≤ 0.05 in the ANOVA model was considered as statistically significant. The raw data were analyzed for outliers, and no data were excluded. The data of fecal score were tested for normal distribution and analyzed as repeated measurements in a completely randomized design using the MIXED procedure of SAS 2002-2010, Release 9.3.

3. Results and Discussion

During the study period, the general health status of piglets was normal with no mortality and morbidity observed in different treatment groups. The fecal scoring results didn’t show any statistically significant differences between control and treatment groups (all P > 0.05, Table 2). The LW and ADFI for the weaned piglets during three growing stages (D0 - D21, D21 - D42 and D42 - D90) and the whole 90-day trial period (D0 - D90) are shown in Table 3. There were no significant differences in LW between the control (T1) and treatment groups (T2, T3, T4 group, fed with 100, 500, 1000 mg Sangrovit®/kg feed) during the three growing stages (treatment effect P > 0.05 for both sex). Additionally, no statistically significant differences were observed among different feeding groups (treatment effect P > 0.05 for both sex) in ADG,ADFI, and F:G over different growth stages and the whole 90-day trial period. It is noted that there was a statistically significant treatment × sex interaction in ADFI for the whole study period (P = 0.0305), but the interaction was not observed in other performance parameters (all P > 0.05). A statistical analysis by each sex was conducted and no statistically significant differences were found in ADFI in separated sex. The results are in agreement with previous findings in which 21-day-old hybrid piglets fed a basal feed supplemented with 2 mg MCE (containing 1.28 mg sanguinarine and 0.44 mg chelerythrine)/kg feed and 100 mg MCE (containing 64.03 mg sanguinarine and 21.99 mg chelerythrine)/kg feed for 90 days displayed growth characteristics (e.g., feed conversion efficiency) very similar to the corresponding control piglets [18] . However, Kantas et al. [3] found that supplementation of 50 mg/kg Sangrovit® (containing 0.75 mg/kg sanguinarine) in the feed significantly increased feed consumption and feed conversion ratio in six-week-old piglets, which is not observed in this study. The discrepancy between different studies may be attributed to different sample size, difficulty in showing significant growth changes in short period or growth variation in different swine breeds, as Jeroch et al. [19] reported that Sangrovit® exerted a significant effect on performance results (body weight gain, feed conversion ratio) in two out of four experiment conducted on different swine breeds, but there were no effects

Table 2 Fecal score in female and castrated male piglets

Trial periods	T1 Control		T2 100 mg/kg Sangrovit®		T3 500 mg/kg Sangrovit®		T4 1000 mg/kg Sangrovit®		Treatment effect (P=)
Trial periods	F	CM	F	CM	F	CM	F	CM	Treatment effect (P=)
D0 - D21	1.54 ± 0.50	1.50 ± 0.53	1.54 ± 0.50	1.37 ± 0.49	1.55 ± 0.50	1.43 ± 0.50	1.55 ± 0.52	1.48 ± 0.50	0.9116
D21 - D42	1.48 ± 0.50	1.57 ± 0.52	1.36 ± 0.48	1.51 ± 0.53	1.52 ± 0.50	1.35 ± 0.48	1.36 ± 0.48	1.52 ± 0.50	0.5170
D42 - D90	1.46 ± 0.51	1.52 ± 0.51	1.39 ± 0.49	1.48 ± 0.50	1.38 ± 0.50	1.48 ± 0.50	1.38 ± 0.49	1.48 ± 0.52	0.8502
D0 - D90	1.48 ± 0.51	1.53 ± 0.52	1.42 ± 0.49	1.46 ± 0.50	1.45 ± 0.50	1.44 ± 0.50	1.41 ± 0.50	1.49 ± 0.51	0.6922

Score: 1 = well-formed feces, 2 = sloppy feces, 3 = diarrhea. The statistic comparisons were conducted between control and treatment groups for the animals in the same gender (female vs. female, castrated male vs. castrated male). F = female piglets, CM = castrated male piglets, n = 16/sex in each group. Treatment effects was calculated for animals in both sex (n = 32). No statistical differences were found between different groups (all P > 0.05).

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