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1.
Luteal activity and effect of dietary energy restriction on follicular development in lactating cows
Antonella Comin, Tanja Peric, M. Montillo, Maria Cristina Veronesi, Vittorio Marchi, Alberto Cappa, Alberto Prandi, 2017, izvirni znanstveni članek

Opis: The aim of this research has been to evaluate the presence of anomalies in the ovarian cycle activity during postpartum and to verify whether 72-hr dietary fasting during the dominance phase, the phase before ovulation, might modify the ovarian follicle population. The presence of anomalies in ovarian cycle activity has been evaluated in 30 Italian Friesian cows starting from 20 days postpartum until 211 days of lactation. Long oestrus and brief dioestrus or scarce luteal activity have been the main anomalies found through measuring progesterone concentrations in the whey. Until 100 days of lactation, the BCS values of the problematic animals have been significantly lower than those in animals with normal ovarian activity. After 100 days of lactation, the ovarian anomalies continued to appear despite the fact that all the animals have reached comparable BCS values. Starting from the results of this trial, the effect of 72-hr dietary fasting on dominant follicles has been studied in six cows. Ultrasonography revealed that the diameter of the follicles at 71 days postpartum has been significantly lower than at 181 days. A 72-hr dietary restriction at 101 and 211 days postpartum did not affect the size of the dominant follicle. However, at 101 days postpartum, half of the animals presented follicular cysts. The effect of fasting differed if the animal has been in early postpartum or 211 days of lactation. Further researches are necessary to understand how different metabolic conditions can modify the follicular population but on the other hand the study shows the utility for farmers and field veterinarians of monitoring the resumption of the ovarian cycle postpartum through the whey progesterone concentrations.
Najdeno v: osebi
Ključne besede: dairy cow, cyclic activity, follicles, fasting
Objavljeno: 06.04.2017; Ogledov: 363; Prenosov: 0
.pdf Polno besedilo (651,67 KB)

2.
Hair cortisol and testosterone concentrations and semen production of Bos taurus bulls
Mirco Corazzin, Maria Cristina Veronesi, Antonella Comin, Marta Montillo, Tanja Peric, Giuseppe Stradaioli, Alberto Prandi, 2017, izvirni znanstveni članek

Opis: The experiment was aimed to evaluate the usefulness of hair cortisol concentrations (HCC) in revealing the activation of the hypothalamic-pituitary-adrenal (HPA) axis due to the passage of young bulls from genetic rearing stations to artificial insemination (AI) centre and the influence of this passage on hair testosterone concentrations (HTC). Hair samples on 33 yearling bulls were collected at the time of arrival (ST1) to the AI centre and 3 more hair samples (ST2, ST3, ST4) were collected at monthly intervals. After the end of quarantine each animal was submitted to the standard procedures for collection and production of semen. Overall HCC were significantly affected by period of collection (p<.01). In particular, HCC was higher in samples obtained after finishing the quarantine period (ST2) compared with those obtained on ST1. After ST2, the HCC decreased reaching at ST4 a value similar to that recorded at ST1. An effect of sampling time on HTC was not found (p>.05). The effect of breed was observed only for HTC that was higher in PRI than BS (p<.01). The HCC group have not influenced the semen variables (p>.05). On the contrary, the effect of breed was evident. The results of this study replicated the effects of a major environmental stressor on mean cortisol concentrations assessed in hair, and add to the growing body of evidence that HCC is an effective and simply collected marker for long-term activity of the HPA system in response to persistent environmental challenge.
Najdeno v: osebi
Ključne besede: Hair, bulls, cortisol, testosterone, semen
Objavljeno: 20.03.2017; Ogledov: 391; Prenosov: 0
.pdf Polno besedilo (1,71 MB)

3.
Cortisol fetal fluids and newborn outcome in term pregnancy small-sized purebred dogs.
Barbara Bolis, Tanja Peric, Alessandro Rota, Massimo Faustini, Maria Cristina Veronesi, 2016, objavljeni povzetek znanstvenega prispevka na konferenci

Opis: In order to provide further information about canine perinatology, and because of the scarce knowledge about fetal fluids composition in dogs, the present study was aimed to assess the cortisol concentrations in fetal fluids collected from small-sized purebred newborn puppies born by elective cesarean section, at term of pregnancy (Meloni et al, 2014). Furthermore we assessed possible correlations of amniotic and allantoic cortisol concentrations and newborn outcome at 24 hours of age and with the newborn gender. Fetal fluids cortisol concentrations were also evaluated for correlation with maternal parity, litter-size, neonatal gender, birth weight and Apgar score (Veronesi et al, 2009). The study, performed on 50 born alive, normal weighed puppies, without gross physical malformation, showed that cortisol concentration was higher in allantoic than in amniotic fluid (p<0.01), even if a strong positive correlation between the two fluids cortisol concentration was found (p<0.0001; R=0.83). Interestingly, higher amniotic (p<0.05) cortisol concentrations were associated to puppies not surviving at 24 hours after birth. Therefore it could be suggested that this parameter may be useful for the recognition, at birth, of puppies needing special surveillance in the first day of age. In relation to the other evaluated parameters, no correlations with amniotic or allantoic cortisol concentrations were found. In conclusion, the present results showed that in small-sized purebred puppies, born at term by elective caesarean section, the evaluation of amniotic cortisol concentration seems useful for the detection of puppies that need special surveillance during the first 24 hours of age, and should be coupled to the newborn evaluation by Apgar score.
Najdeno v: osebi
Povzetek najdenega: ...litter-size, neonatal gender, birth weight and Apgar score ( Veronesi et al, 2009). The study, performed on...
Ključne besede: cortisol, fetal fluids, pregnancy, dog
Objavljeno: 12.05.2017; Ogledov: 336; Prenosov: 14
.pdf Polno besedilo (711,48 KB)

4.
DEHYDROEPIANDROSTERONE SULFATE CLAWS CONCENTRATIONS IN DOGS FROM BIRTH TO 30 DAYS OF AGE: PRELIMINARY RESULTS.
Jasmine Fusi, Marta Montillo, Barbara Bolis, Alessandro Rota, Tanja Peric, Maria Cristina Veronesi, 2017, objavljeni povzetek znanstvenega prispevka na konferenci

Opis: Similarly to all other species, also in the dog improvements in the knowledge on perinatology are mandatory for a better management of newborns, mainly aimed to reduce the impact of perinatal mortality. However, until recently, the study of canine perinatology was limited mainly because of the invasiveness of many investigation procedures, such as repeated blood sampling. In recent times, the claws/nails were proved to be a useful, non invasive, matrix for long time-frame retrospective hormone concentrations analysis also in babies and puppies [1,2], providing a suitable matrix for perinatal long-term hormonal changes studies. The last intrauterine foetal stage of development and the neonatal period represent the most challenging phases for the mammals offspring. It was demonstrated that the activation of the fetal hypothalamic-pituitary-adrenal (HPA) axis leads to dehydroepiandrosterone (DHEA) and DHEA sulfate (DHEA-S) secretion, the major fetal steroids. Thus, DHEA-S measured at birth in newborns could be considered as a marker of offspring HPA axis activity, under the maternal influence. This study was aimed to assess the DHEA-S concentrations in newborn puppies claws, collected at birth and at 30 days of age, and to evaluate the possible influence of age, gender and type of birth on DHEA-S claws accumulation. The study was performed on 58 large purebred, normal, healthy, viable (Apgar≥7) puppies, 31 males and 27 females, born by vaginal spontaneous (N=22) or caesarean (N=36) parturition. DHEA-S was analysed by RIA. The mean ± SD DHEA-S claws concentration significantly (p<0.01) decreased from birth (210±152.00 pg/mg) to 30 days (91±72.63 pg/mg), evidencing the higher fetal DHEA-S secretion in the last fetal stage of pregnancy in comparison to the first postnatal month of age. According to the type of parturition, higher (p<0.001) DHEA-S claws concentrations were found at birth in puppies born by spontaneous than caesarean parturition (300±167.05 vs 154±112.23 pg/mg, respectively); this finding deserves further investigations. No influence of newborn gender was found. Claws DHEA-S values at birth were a bit higher, but with a lower SD, in comparison to data reported for babies 1-3 weeks old [1]. The trend of decrease is in agreement with data reported for cortisol [2] in dead puppies, and suggests, beside the role of cortisol, the important effects of DHEA-S around the time of birth, also in puppies, as reported for babies [1]. [1] Tegethoff et al. Dehydroepindrosterone in nails of infants: a potential biomarker of intrauterine responses to maternal stress. Biological psychology, 87: 414-420, 2011. [2] Veronesi et al. Coat and claws as new matrices for noninvasive long-term cortisol assessment in dogs from birth up to 30 days of age. Theriogenology, 84: 791-796, 2015.
Najdeno v: osebi
Povzetek najdenega: ...stress. Biological psychology, 87: 414-420, 2011. [2] Veronesi et al. Coat and claws as new...
Ključne besede: DHEA-S, claw, dog
Objavljeno: 22.08.2017; Ogledov: 245; Prenosov: 0
.pdf Polno besedilo (4,69 MB)

5.
Cortisol claws concentrations in dogs from birth to 60 days of age
Jasmine Fusi, Tanja Peric, Barbara Bolis, Alessandro Rota, Antonella Comin, Maria Cristina Veronesi, 2017, objavljeni povzetek znanstvenega prispevka na konferenci

Opis: During the last fetal stage of development and in the neonatal period, the hypothalamic- pituitary- adrenal (HPA) axis secretes cortisol (C), responsible for several physiologic processes. The claws were recently proved to be a useful, non- invasive matrix for long time- frame retrospective C levels analysis also in puppies (Veronesi et al. 2015, Theriogenology 84:791–796). Because of the scarce knowledge on canine perinatology, this study was aimed to assess the C concentrations in claws of newborn puppies collected at birth, 30 and 60 days of age, and to evaluate the possible influence of age, gender and type of birth on C claws accumulation. The study was performed on 58 large purebred, normal, healthy puppies, born by spontaneous or cesarean parturition. The mean C claws concentrations significantly decrease from birth (26 ± 16.39 pg/mg) to 30 (10 ± 4.53 pg/mg) and 60 (6 ± 3.12 pg/mg) days of age (p < 0.0001); a decrease was also seen from 30 to 60 days of age (p < 0.05). No influence of newborn gender and type of birth was found. This trend of decrease is in agreement with data reported by (Veronesi et al. 2015, Theriogenology 84:791–796) in dead puppies, and suggests the important role of C around the time of birth. However the exact source of the C accumulated in claws of puppies at birth must be clarified, while the source of C accumulated at 30, and even more at 60 days, can be supposed to be addressed to the newborn itself.
Najdeno v: osebi
Povzetek najdenega: ...retrospective C levels analysis also in puppies ( Veronesi et al. 2015, Theriogenology 84:791–796). Because of...
Ključne besede: Cortisol, claws, dog
Objavljeno: 01.09.2017; Ogledov: 183; Prenosov: 0
.pdf Polno besedilo (7,74 MB)

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