Suitability of artisanal fishery discards as feed for juvenile tub gurnard (chelidonichthys lucerna L.) reared in sea bottom cages in the mid Adriatic Sea

The suitability of using discards from artisanal fisheries as feed for wild-caught Chelidonichthys lucerna (L.) reared in submerged cages in the Adriatic Sea was investigated. Three-hundred juvenile tub gurnard (72.9 ± 11 g, 18 ± 1 cm) were captured and separated into four circular 35.3 m3 submerged cages. Two stocking densities were used: two cages contained 60 fish each (1.7 fish m-3; CG-L) and two cages contained 90 fish each (2.55 fish m-3; CG-H). Growth performance and survival rates were recorded over a 240 day period during which tub gurnard were fed with a variety non-target fishery discards, including common crab, sardine, Atlantic chub mackerel, anchovy, and salema. The survival rate was approximately 90% in both groups (CG-L = 91% and CG-H = 90%), with final stocking densities of 0.32 kg m-3 and 0.49 kg m-3 for the CG-L and CG-H groups, respectively. There were no significant differences in final mean body weight or length between the CG-L group (206 ± 23 g, 24.6 ± 2 cm) and the CG-H group (215.5 ± 32 g, 24.8 ± 2 cm). The condition index was similar between the two groups (1.38 and 1.42 for CG-L and CG-H, respectively). The feed conversion ratio was high in both the CG-H (2.39) and CG-L (2.32) cages. These results demonstrate that viable growth rates of tub gurnard may be obtained by feeding recycled fishery discards and rearing in cages placed on the seabed, which allows for the natural benthic behavior of this species

Pharmacokinetics of tramadol and its major metabolite after intramuscular administration in piglets

Tramadol (T) is a centrally acting atypical opioid used for treatment of dogs. Piglets might experience pain following castration, tooth clipping and tail docking and experimental procedures. The aim of this study was to assess the pharmacokinetics of T and its active metabolite M1 in male piglets after a single intramuscular injection. Six healthy male piglets were administered T (5 mg/kg) intramuscularly. Blood was sampled at scheduled time intervals and drug plasma concentrations evaluated by a validated HPLC method. T plasma concentration was quantitatively detectable from 0.083 to 8 h. M1 was quantified over a shorter time period (0.083–6 h) with a Tmax at 0.821 h. The study demonstrated that piglets produce a larger amount of M1 compared with dogs, horses and goats. The human minimum effective concentration of M1 (40 ng/mL) was exceeded for over 3 h in piglets. If it is assumed to also apply to piglets, it could be speculated that the drug efficacy might exert its action over 3 h or longer. This assumption has to be confirmed by further specific pharmacokinetic/pharmacodynamic studies

Guaiphenesin-ketamine-xylazine infusion to maintain anesthesia in mules undergoing field castration.

Abstract Background: In order to determine whether a combination of guaiphenesin, ketamine and xylazine can induce safe and satisfactory anaesthesia in mules undergoing field castration, eight healthy adult intact male mules were employed. They were premedicated with intravenous (IV) xylazine (1.3 mg/kg); an additional dose of xylazine (0.3 mg/ kg IV) was administered in case of inadequate depth of sedation. Anaesthesia was induced with IV thiopental (6 mg/ kg). The quality of sedation and induction was recorded. Anaesthesia was maintained with an infusion of guaiphenesin (50 mg/mL), ketamine (2 mg/mL) and xylazine (1 mg/mL) (GKX). The spermatic cord of each testis was infiltrated with 5 mL of 2% lidocaine. During anaesthesia heart rate (HR), respiratory rate (RR), rectal temperature (RT) and haemoglobin oxygen saturation ( SpO2) were measured every 5 min. The data were analysed with simple one-way analysis of variance (ANOVA). A P value < 0.05 was considered statistically significant. Time of anesthesia, time of surgery and time of recovery were recorded. Results: Only one mule required an additional dose of xylazine to achieve a satisfactory depth of sedation. Thiopental at the dose of 6 mg/kg IV resulted in smooth induction and lateral recumbency in all animals. GKX provided adequate anaesthesia to perform castration in all mules. Muscle relaxation was deemed adequate and physiological variables remained stable and within references values during the anaesthesia and did not change in response to surgical stimulation. Time (mean ± standard deviation) from the end of the infusion to sternal recumbency and time from sternal recumbency to standing were 27.7 ± 4.6 and 30.1 ± 7.7 min, respectively. Conclusions: The combination of xylazine, thiopental and GKX provides satisfactory short-term anaesthesia in mules undergoing field castration

Clinical investigation on Theileria equi and Babesia caballi infections in Italian donkeys

Background: Interest in the welfare and diseases of donkeys is constantly increasing in several countries. Despite this, clinical research into donkeys needs to be in continual development since they show different reactions compared to horses in many conditions, including infectious diseases, and need specific clinical and therapeutic approaches. No reports are currently available on clinical and clinical pathology data regarding donkeys with natural piroplasms infection. Results: Venous blood samples were taken from one hundred and thirty eight donkeys and underwent indirect fluorescent antibody test (IFAT) to detect IgG antibodies against Theileria equi and Babesia caballi and real-time polimerase chain reaction (PCR) to detect Babesia spp. and Theileria spp.. Clinical examinations, haematological analyses and serum bilirubin evaluation were also performed and compared with positive or negative status. A seroprevalence of 40.6% and 47.8% was found for T. equi and B. caballi, respectively; double positivity was detected in 19.6% of the animals. PCR results showed that 17.4% of the animals tested positive for T.equi and 3.6% for B. caballi with no double positivity. Twelve donkeys (8.7%) had clinical signs consistent with chronic forms of the disease and no acute forms were detected. Fifty-eight donkeys had haematological and serum bilirubin alterations and 56 (96.6%) of them were IFAT and/or PCR positive. Changes in erythrocyte number, packed cell volume, hemoglobin concentration, mean corpuscular hemoglobin, platelets number and total bilirubin were significantly associated with positive and symptomatic animals. Conclusion: Nonspecific clinical presentation seems to be very common in donkeys and several clinical pathology alterations persist after natural infection. Therefore, apparently healthy donkeys can have masked but severe clinical pathology alterations. Acute forms are very seldom observed in donkeys. Clinical monitoring of chronically infected donkeys is recommended since such animals represent a risk both for transmission to other animals and for their own health; furthermore, their production performances could be reduced. The study should also be intended as a contribution for veterinary practitioners because it describes the most usual clinical presentations and laboratory findings of equine piroplasmosis in naturally infected donkeys in endemic areas

Anesthetic Management during Cesarean Section in English Bulldogs

The authors describe their experience with the management of the perioperative period, general anesthesia and the postoperative period in English bulldogs undergoing elective cesarean section and its effect on the neonates. The anesthetist for animals undergoing cesarean operation must be aware of any special needs, not only of the patient undergoing surgery, but also of the neonates. Anesthetic drugs administered to the pregnant patient will readily cross the placenta and affect them, with the exception of local anesthetics. Pregnant female patients are at increased anesthetic risk due to pregnancy-associated physiological alterations, such as altered pulmonary function. The anesthetist is often called to perform anesthesia on brachycephalic dogs for an elective cesarean section. Due to their conformation, these animals may have one or more anatomical abnormalities of the upper airways, which compromise the ability to ventilate adequately. The induction and recovery phases of anesthesia can be extremely dangerous in these patients, but the maintenance phase is generally fairly straightforward because the airways are controlled during maintenance. In addition, vagal tone is frequently high and this can contribute towards significant bradycardia and further airway narrowing. All these reasons make general anesthesia in brachycephalic dogs undergoing cesarean section rather complicated

Use of Nanohydroxyapatite in Regenerative Therapy in Dogs Affected by Periodontopathy: Preliminary Results

Background: The present study aims to analyse the in vivo behaviour of nanohydroxyapatite and to assess its regenerative capacity in dogs affected by periodontal disease. Methods and findings: The dogs employed in the study were randomly subdivided into a control group and an experimental group. After clinical, instrumental and radiological examinations, all the subjects underwent dental prophylaxis and a bioptic sample was taken. A histopathological examination of the periodontal tissues, in correspondence to teeth with periodontopathy ranging between stages 2 and 3, followed. Regenerative therapy with applications of nanohydroxyapatite was administered only to the dogs of the experimental group. After a period of between 35 and 40 days, a further clinical, instrumental and radiological examination was carried out and a bioptic sample taken solely on the dogs whose histological examinations showed changes ascribable to periodontal disease. The results of the histopathological examination demonstrated that only the dogs in the experimental group, who underwent dental prophylaxis together with the administration of nanohydroxyapatite, showed clear signs of improvement with respect to their initial condition. Conclusions: In conclusion the study demonstrated that the nanohydroxyapatite represents a valid osteoconductive and osteoinductive graft product and confirmed its regenerative potential in periodontal therapy in dogs

Use of Nanohydroxyapatite in regenerative therapy in dogs affected by periodontopathy: preliminary results

Nanosized ceramics may represent a promising class of bone graft substitutes due to their improved osseointegrative and osseoinductive properties. Nanohydroxyapatite binds itself to the bone and favours bone healing by stimulation of osteoblast activity (Singh et al., 2012). The present study aims to analyse the in vivo behaviour of nanohydroxyapatite and to assess its regenerative capacity in dogs affected by periodontal disease. Twenty-eight dogs of different breeds, aged between 5 and 15 years, were employed in the study and were randomly subdivided into a control group and an experimental group. After clinical, instrumental and radiological examinations to estimate the severity of the disease, all the subjects underwent dental prophylaxis and a bioptic sample was taken. A histopathological examination of the periodontal tissues, in correspondence with teeth with periodontopathy ranging between grades II and III, followed. Regenerative therapy with applications of nanohydroxyapatite was administered only to the dogs of the experimental group. After a period of between 30 and 42 days, a further clinical, instrumental and radiological examination was carried out and a bioptic sample taken solely on the dogs whose histological examinations showed changes ascribable to periodontal disease. The results of the histopathological examination demonstrated that the subjects belonging to the control group, who only underwent the dental prophylaxis, in no case showed any histopathological improvement. In 6 out of 14 cases, the situation remained stationary and in the remaining 8 there was a clear deterioration. On the contrary, all the dogs in the experimental group, who underwent dental prophylaxis together with the administration of nanohydroxyapatite, showed clear signs of improvement with respect to their initial condition. Furthermore, there was no sign of any inflammatory reaction in the areas which had been treated with nanohydroxyapatite. In conclusion the study demonstrated the regenerative potential of nanohydroxyapatite in periodontal therapy. In fact, its use as a graft material has produced very satisfactory results, which have been supported without doubt by the histopathological examinations. Thus, nanohydroxyapatite represents a valid osteoconductive and osteoinductive graft product in dogs. However, more research is needed and it is, therefore, imperative to extend the case histories and further standardize diagnostic methods. Singh VP, Nayak DG, Uppoor AS, Shah D: Clinical and radiographic evaluation of Nano-crystalline hydroxyapatite bone graft (Sybograf) in combination with bioresorbable collagen membrane (Periocol) in periodontal intrabony defects. Dental Research Journal, 2012; 9: 60-67

A scientific contribution towards sustainable aquaculture

The present PhD project has been made possible thanks to the support and collaboration of the major rainbow trout (Oncorhynchus mykiss, Walb.) farm in Europe. It was initially based on the original research proposal aimed at examining rainbow trout aquaculture in order to find alternative raw materials to be utilized in the formulation of feed for all the stages of breeding of this important salmonid. However, in 2017 the farm which funded the research project began rearing marine fish species in the Adriatic Sea and it was, therefore, decided to widen the scope of the study to include European gilthead sea bream (Sparus aurata, L.). During the course of the PhD triennium various activities relating to the above two species were carried out. With regard to rainbow trout, the first of the tree main studies focused on the effects on broodstocks of a diet which included materials of vegetable origin; the second assessed the supplementation of an innovative emulsifier into the diet of juveniles to improve the assimilation of lipids; the last one examined the qualitative traits of by products obtained by rainbow trout processing for their possible reutilization. In particular, a trial was carried out employing 4-year-old broodstocks of rainbow trout – both females and males – fed on a diet which totally substituted fish meal with vegetable meal and partially substituted (50%) fish oil with linseed oil. The effects of this diet, compared to a control diet containing fish meal and fish oil, were evaluated in terms of reproductive performances: quality of eggs, hatching and fingerling survival rate and mean body weight. Based on the results of this trial, it was possible to assume that feedstuffs containing vegetable protein and fat administered to broodstocks, negatively affected the quality of gametes and the progeny of rainbow trout. The second trial was performed in order to investigate the effects on the growth performance and feed conversion rate of diets supplemented, at two different doses, with a new emulsifier aimed at increasing lipid assimilation in rainbow trout juveniles. After 90 days of experimental feeding, the overall results of rainbow trout fed on the supplemented diets, can be considered satisfactory and within the normal range for the species size. Concerning the histology of the intestinal tract, a lower degree of irritation was observed in the trout fed on the experimental diets compared to those fed on the diets without the additive. The emulsifier supplemented in the feeds, resulted in beneficial effects together with a better welfare status of the rainbow trout. The research went on to consider the qualitative traits of by-products obtained by rainbow trout processing, including muscle meat and skin. This issue has become more pressing worldwide due to the ever-increasing amount of waste and wastewater. Recently, attention has been focused on the possibility of extracting precious nutrients from rendered fish proteins. In this study, the proximate composition and the fatty acid profile of rendered rainbow trout were evaluated and compared with the traits of the trimmed fillet. The results showed that rendered fish from rainbow trout processing still contains valuable nutrients, which could be successfully considered as possible feedstuff and also employed in various sectors and in innovative ways as, for example, in the production of finger food and fish burgers. Concerning sea bream, our research assessed the effects on the growth of juveniles of a partial substitution of fish meal with insect meal in their diet. Furthermore, the possibility of eliminating the use of antibiotics in sea bream rearing was also examined. In the last few years, insect meal has become one of the most studied sources of protein feedstuffs as an alternative to fish meal. A growing trial was performed in order to evaluate the efficacy of the inclusion of chironomid meal in the feed of gilthead sea bream juveniles. To this aim, samples of chironomid midges at larval stage were collected from aquatic environments, converted into meal and analysed from a qualitative point of view. Two experimental feeds with a different percentage of replacement were tested and compared to a control diet where the chironomid meal was absent. The experimental diets resulted in excellent palatability and led to satisfactory growth performances. The research also considered the possibility of rearing gilthead sea bream without the use of antibiotics. In recent years, the issue of antimicrobial resistance has become of prime importance at an international level. The possibility of rearing antibiotic free fish is the challenge we face in the twenty-first century. In this context, the company involved in this Eureka project, has decided to work towards the improvement of rearing techniques, biosafety and the management of environmental parameters, in order to reach high standards of animal welfare, from breeding to transportation and subsequent stages, in the hope that this will result in a successful battle against antibiotic-resistance. To this goal, a trial was performed monitoring the production cycle of gilthead sea bream that were farmed adopting an antibiotic free protocol in an offshore cage plant. Their growth performance, health status and flesh quality were then compared with conspecific wild fish. The antibiotic free sea bream were fed on a diet that contained not only raw materials of aquatic origin – which constituted the main source of essential fatty acids of the omega 3 series – but also those of vegetable origin, in full respect of environmental sustainability. There was a strong similarity between the morphometric parameters and somatic indices of the two fish groups of different origin. Moreover, the antibiotic free sea bream displayed a very low lipid fraction similar to that of the fish captured in the Adriatic Sea, which classified them in the category of lean fish. Data concerning the omega 3 content, demonstrated that the antibiotic free samples could be defined either as “Rich in omega 3”, or as an “Omega-3 source”