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Macri F.,Messina University | Liotta L.,Messina University | Bonfiglio R.,Messina University | De Stefano C.,Veterinarian | And 2 more authors.
Journal of Fish Biology | Year: 2013

In this study, ultrasonographic examination was performed thrice, 15days apart, on juvenile European sea bass Dicentrarchus labrax, from 330 to 360days of age, to assess the size and the morphology of male and female. Results have proved this method as a suitable and non-invasive procedure to assess sexual differentiation. © 2013 The Fisheries Society of the British Isles. Source


Becer U.K.,Veterinarian | Filazi A.,Ankara University
Fresenius Environmental Bulletin | Year: 2010

The aim of this study was to investigate the aflatoxin, nitrate and nitrite levels in commercial cat and dog foods. For this purpose, 50 different cat (25 imported, 25 local) and 50 different dog food (25 imported, 25 local) were screened (aflatoxin analysis performed by TLC and nitratenitrite by spectrophotometric methods). According to the results, none of the cat foods had aflatoxin contamination whereas in two local and one imported dog food sample 5.33, 8 and 8 ppb of AFBl were found, respectively. Nitrate-nitrite amounts in 100 samples were found to be lower than safety levels. Nitrate content of local dog food was found to be 0.009 ± 0.001 (0.001-0.042) ppm, in cat food 0.017 ± 0.002 (0.003-0.043) ppm, imported dog food 0.007 ± 0.001 (0.002-0.047) ppm, and in cat food 0.007 ± 0.001 (0.001-0.038) ppm. Nitrite content of local dog food was found to be 0.008 ± 0.001 (0.001-0.035) ppm, in cat food 0.015 ± 0.002 (0.001-0.044) ppm, in imported dog food 0.011 ± 0.002 (0.002-0.053) ppm, and in cat food 0.009 ± 0.001(0.001-0.036) ppm. The statistical analysis showed that there were no significant differences between the local and imported dog food concerning the nitrate-nitrite amounts (P>0.05), whereas in cat foods this difference was found more significant (P< 0.01). These results showed that the amounts of aflatoxin and nitrate-nitrite in local and imported cat and dog food in Turkey were found below the safety levels. © by PSP. Source


Karangelil M.,Democritus University of Thrace | Abas Z.,Democritus University of Thrace | Koutroumanidis T.,Democritus University of Thrace | Malesios C.,Democritus University of Thrace | Giannakopoulos C.,Veterinarian
CEUR Workshop Proceedings | Year: 2011

The objectives of this study were: (i) to compare five models (Wood, Cobby & Le Du, Wilmink, Cappio Borlino, Djikstra) for describing the lactation curve of Chios sheep, (ii) to identify variation in lactation parameters related to environmental factors (season) and animal factors (parity). A data base on 61,705 recordings of daily milk production obtained from an automatic milking system was used. The lactation models were individually adjusted for each lactation. Analysis of variance was performed for the comparison of the parameter estimates. The goodness of fit measures used for comparisons of the models was the coefficient of determination (R2), mean of mean square error (MMSE), Akaike information criterion (AIC), corrected Akaike information criterion (AICc) and Bayesian information criterion (BIC). Wood model had the lowest values for information criteria (MMSE = 347.4681, AIC = 1,056.436, AICc = 1,056.733, BIC = 1,063.856) and the highest value for the coefficient of determination (R2=0.79). The highest values for information criteria were found for Djikstra's model (MMSE = 636.6438, AIC = 1,076.621, AICc = 1,077.117, BIC = 1,086.582) having the same time the lowest value for the coefficient of determination (R2=0.59). Overall, Wood (1967) model showed the best adjustment. Despite of being more recent, the model by Djikstra (1997) mechanist based and with a higher number of parameters showed a low convergence for the data used. Wood model (1967) has a greater advantage of producing a good fit measurement with only three parameters. Source


Comin A.,University of Udine | Veronesi M.C.,University of Milan | Montillo M.,University of Udine | Faustini M.,University of Milan | And 3 more authors.
Veterinary Journal | Year: 2012

Stimulation of the hypothalamic-pituitary-adrenal (HPA) axis and elevated cortisol concentrations in fetal plasma are associated with foal maturity, viability and adaptation to independent life. However, non-invasive measurement of cortisol in hair samples has not yet been validated in horses. The current study developed a radioimmunoassay to analyse cortisol in horse hair and was used to measure cortisol hair concentration at birth and at 30 and 60. days of age as a retrospective study of HPA axis activity. Cortisol was detectable in the hair of foals from birth until 2. months, but decreased with time and varied greatly between individuals. Analysis of hair cortisol could be useful for non-invasive retrospective studies of HPA axis activity in perinatal horse. © 2012 Elsevier Ltd. Source


Favetto P.H.,Veterinarian | Hoar B.R.,University of California at Davis | Myers D.M.,Research and Extension Center | Tindall J.,Research and Extension Center
California Agriculture | Year: 2010

The accurate determination of pubertal status in yearling beef heifers, possibly combined with the use of exogenous progesterone, allows females to produce the maximum number of calves over their lifetimes. This study aimed to determine the reliability of a reproductive tract scoring (RTS) system that combines manual palpation with ultrasound as a measure of pubertal status, and whether the treatment of heifers with progesterone-containing vaginal inserts - followed by breeding on the second estrus after removal of the insert - could result in increased conception rates compared to untreated heifers. Over 2 years, we found that RTS predicted pubertal status reasonably accurately. Progesterone-treated heifers were more likely to exhibit estrus than control heifers, but their overall breeding efficiency was not affected by progesterone treatment. Inadequate nutrition associated with increased pasture stocking density during both breeding seasons likely had a negative effect on the results of our study. Source

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