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Articles by P.G. Peiretti
Total Records ( 6 ) for P.G. Peiretti
  P.G. Peiretti
  Hemp (Cannabis sativa L.) has been studied to determine the Fatty Acid (FA) content, chemical composition and Gross Energy (GE) of the plant during growth. Herbage samples were collected 4 times at progressive morphological stages from the mid vegetative to the early flower stage. The most abundant FA in the plant during these growth stages was α-linolenic acid (C18:3 n-3) and it ranged between 48-54% of the total FA. The FA analyses disclosed quantitative differences between the plant stages. Palmitic acid (C16:0), oleic acid (C18:1 n-9) and linoleic acid (C18:2 n-6) decreased with increasing growth stage. There was a lack of γ-linolenic acid (C18:3n-6) at all stages of the hemp plant during growth. The dry matter, organic matter and acid detergent lignin content increased with increasing growth stage, while the ash and crude protein decreased from the mid vegetative stage to the shooting and late vegetative stage, respectively. Neutral detergent fibre increased from the first to the third stages and then decreased. GE was higher at the shooting stage than at the other stages.
  P.G. Peiretti
  Galega (Galega officinalis L.) is one of the least investigated perennial leguminous herbs. It is usually present in natural pastures, grazed by animals, in Mediterranean areas and in the Italian Alps and Apennines below 1000 m. The aim of this study was to investigate the effect of the stage of maturity on the ensilability characteristics and to evaluate the fermentation quality of silage produced from first cut and regrowth of G. officinalis in the Po valley, northern Italy. The growth of G. officinalis was characterised by a rapid Dry Matter (DM) accumulation in the herbage during development and the DM content increased from 111-157 g kg-1 Fresh Matter (FM), while at the regrowth stage it was 180 g kg-1 FM. No significant changes were observed in the pH or Water Soluble Carbohydrates (WSC) content. The Buffering Capacity (BC) was lower at the regrowth than at the other three first cut stages, while Total Nitrogen (TN) and Soluble Nitrogen (SN) were low at the budding stage. Three types of silage without additives, wilted silage 1 day after wilting at the budding stage, wilted silage 2 days after wilting at the budding stage and wilted silage 1 day after wilting at the regrowth stage were prepared to investigate the effects of wilting on the chemical composition and characterstics of silage fermentation. The results of ensiling indicate that the fermentation of pure G. officinalis is characterized by the presence of alcohol and acetic acid and a lack of lactic acid and butyric acid. The good results obtained in lab-scale silos would seem to suggest that G. officinalis has the potential for large scale ensiling, if galega is harvested at the budding stage or during regrowth and then wilted to a DM level of >350 g kg-1 FM.
  P.G. Peiretti and G. Meineri
  The objective of this study was to determine the effects of different levels of golden flax (Linus usitatissimum L.) seeds (GFS) on rabbit performance and nutrient utilisation. The trial was carried out on 30 crossbred rabbits that were randomly allocated to 3 groups each with 10 animals (5 male and 5 female rabbits each), kept separate in individual cages. Three diets were formulated with increasing levels (0, 8, or 16%) of GFS. The experimental period lasted 5 weeks and the faeces were collected during the last week. No obvious health problems were encountered during the experiment. The measured parameters were growth performances and digestibility of Dry Matter (DM), Organic Matter (OM), Crude Protein (CP), Crude Fibre (CF), Ether Extract (EE), Nitrogen Free Extract (NFE), Neutral Detergent Fibre (NDF), Acid Detergent Fibre (ADF) and Gross Energy (GE). The weight gain and food intake did not differ significantly (p>0.05) among the dietary treatments. The digestibility coefficients were calculated according to standard procedures following the indirect digestibility method, using acid insoluble ash as an inert marker. The apparent digestibility of the mixed feed with a GFS inclusion level of 16% was higher than those of the other 2 diets. It can be concluded that golden flaxseed can be given to rabbits at levels of up to 16% in the diet without any adverse effects on growth performance and with a better digestibility than the control diet.
  P.G. Peiretti and G. Meineri
  The aim of the present study was to examine the effects of Dehydroepiandrosterone (DHEA) on the perirenal fat and Longissimus Dorsi (LD) muscle Fatty Acid (FA) profile of rabbits fed diets with low (3%) and high fat (13%) contents. DHEA was given in the diet (0-0.02%) to 15-week-old male New Zealand White rabbits for 3 months. At the end of the experimental period, the rabbits from each group were slaughtered without fasting and the perirenal fat and LD muscle were collected to determine the FA profile. The results show that DHEA, at the experimental dosage, does not influence the FA profile of perirenal fat or LD muscle of rabbits fed different fat content diets.
  G. Meineri , P.G. Peiretti , N. Vitale , A. Vercelli and R. Ferraris
  This study was aimed at evaluating gastroesophageal reflux disease (GERD) in dogs and their owners and to establish the relationship with alimentary factors. Sixty dogs belonging to a veterinary clinic were evaluated together with their owners to investigate their alimentary habits. A dietary questionnaire was given to the dog owners to fill in. A logistic regression model was performed to study any association between diet and GERD symptoms. The results showed an endoscopic GERD presence of 20% in dogs similar to that found in humans. A relationship between diet and GERD symptoms and between GERD symptoms in the dogs and owners was also present. In spite of the limited sample size, the feasibility of the alimentary questionnaire here tested may be useful for further more extensive prospective studies.
  G. Masoero , G. Sala , G. Meineri , P. Cornale , S. Tassone and P.G. Peiretti
  Three groups of ten young rabbits each received a diet enriched with Chia (Salvia hispanica L.) seeds at 0% (C0), 10% (C10) and 15% (C15), respectively. At the end of the experimental period, which lasted 35 days, all the rabbits were slaughtered. The Longissimus Dorsi (LD) muscle and perirenal fat samples were collected 24 h post mortem from each carcass and analysed with a GC method for the Fatty Acid (FA) profiles and their indexes. In vivo Spectroscopy, was conducted using a portable UV-Vis. NIR spectrophotometer (Model LSP LabSpec-Pro; 350-2500 nm). The LD muscle specimens (22 cm long) were fixed in 95% ethanol, stored for 3 days and finally scanned after the tissues had been exposed for 2 h. LD muscle samples were also analysed raw and cooked using a ten-MOS Electronic Nose (EN) device (AIRSENSE). Discrimination of the individuals between couple of groups, fitted with 1 or 2 dummy values, was performed through a Partial Least Square Discriminant Analysis using WinISI II software. The cross-validated R2 coefficients were retained to compare the matrix distances that were clustered in a Hierarchical Analysis. The in vivo and ethanol LD specimen NIR spectra and EN profiles were calibrated with a set of 81 variables. The average cluster, based on the 81 variables, clearly separated the two treated groups from the control group ( R2 of the matrix = 0.854). The in vivo NIR evaluation was similar to the previous one, but at a low level (R2 = 0.316), while the ethanol muscle specimen highlighted the same pattern, in particular at a higher level (R2 = 0.374). The EN evaluation confirmed the differences for the raw muscle (R2 = 0.443), which were then reduced after cooking (R2 = 0.137). The NIRS applied to the live experimental rabbits showed that this feed experiment produced real differences between the groups. The NIRS applied to the muscle tissues prepared with ethanol showed meat quality traits that were also evaluated by a panel test. In conclusion, EN offer significant knowledge, which normally can only be achieved by a trained panel. The digital spectra can be linked to lipo-oxidation of the intramuscular fat and to a wide set of laboratory analyses, but only for very useful indications and not for purely analytical purposes (0.40<R2<0.70).
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