Influence of pregnancy on diurnal and seasonal changes in cortisol, T3 and T4 levels in the mare blood serum

Flisińska-Bojanowska, A; Komosa, Małgorzata; Gill, Janusz

doi:10.1016/0300-9629(91)90571-s

Cited by 42 publications

(12 citation statements)

References 12 publications

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“…Data obtained in donkeys confirm previous data reported in horses, that showed a similar pattern of thyroid hormones, with higher T 3 and T 4 concentrations in barren than in pregnant mares (Flisińska-Bojanowska et al 1991). In addition, the absence of significant differences of T 3 and T 4 concentrations between barren and pregnant donkeys in the same month of sampling confirms previous data observed in barren and pregnant broodmares (Meredith and Dobrinski 2004).…”

Section: Discussionsupporting

confidence: 90%

“…The acrophase of T 4 observed in barren donkeys in February confirms previous data reported for T 4 in mares (Flisińska-Bojanowska et al 1991). On the other hand, the acrophase of T 3 observed in both barren and pregnant donkeys in June does not confirm previous data reported for T 3 in mares, with acrophase occurring in July (Flisińska-Bojanowska et al 1991).…”

Section: Discussionsupporting

confidence: 50%

“…Comparison of results obtained in donkeys with published data reported for horses reveals no discrepancies for circulating total and free iodothyronine concentrations ■■■ P < 0.001) differences in average hormone compared to previous month (Anderson et al 1988;Kaneko 1989;Flisińska-Bojanowska et al 1991), but some variation might be due to differences in the techniques used. Some differences could be explained by the influence of results with physiological or geographic factors and different management.…”

Section: Discussionmentioning

confidence: 54%

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Total and free iodothyronines profile in the donkey (Equus asinus) over a 12-month period

et al. 2012

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Several studies show the correlation between thyroid function and reproductive activity in horses, but no data are available in donkeys. The aim of this study was to determine physiological thyroid changes occurring in 10 pregnant and 14 barren donkeys over a period of 12 months. Blood samples were collected monthly from the jugular vein of pregnant and barren donkeys from June 2008 to June 2009. No significant differences (P < 0.05) in iodothyronine concentrations were observed between pregnant and barren donkeys in the same month. Seasonal total thyroxine (T 4 ) and free triiodothyronine (fT 3 ) patterns remained unmodified, regardless of physiological state, with the lowest T 4 levels at September and the highest at February, and the lowest fT 3 levels at June and the highest at July, in both pregnant and barren donkeys. Ranges of total triiodothyronine (T 3 ) concentrations in pregnant donkeys over a 12 months period ranged from 1.57 to 2

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Section: Discussionsupporting

confidence: 90%

Section: Discussionsupporting

confidence: 50%

Section: Discussionmentioning

confidence: 54%

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Total and free iodothyronines profile in the donkey (Equus asinus) over a 12-month period

et al. 2012

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“…In Lipizzan mares, T 4 values were significantly different between the 7 th and 10 th month of pregnancy, while T 3 values changed only slightly. In contrast to other experiments, the blood sampling in Lipizzan mares was performed on the same day, excluding the possibility of seasonal influences (Flisinska-Boyanowska et al 1991;Slebodzinski 1994). On the other hand, however, the numbers of animals in different groups of pregnancy were too small for accurate estimation of the whole gestation period.…”

Section: Discussionmentioning

confidence: 99%

Serum Triiodothyronine (T3) and Thyroxin (T4) Concentrations in Lipizzan Horses

Čebulj‐Kadunc¹,

Kosec²,

Cestnik³

2003

Acta Vet. Brno

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The Lipizzan horses are a breed with a long breeding history that may have developed differences to other breeds in thyroid hormone concentrations. The objectives of this study were to determine the influences of age, sex and pregnancy on total serum triiodothyronine (T 3 ) and thyroxin (T 4 ) levels in Lipizzans and to compare the results with reference values of other horse breeds. T 3 and T 4 concentrations were determined in blood serum of 131 stallions, 118 mares and 25 foals of the Lipizzan breed by using a radioimmunoassay (RIA), validated for horse serum. The highest thyroid hormone levels were found in foals. The lowest serum T 4 values were obtained in animals aged 16 years and more, the lowest T 3 values in the range of 1 to 3 years. At 4 years, T 3 concentrations rose and then steadily declined. In all categories of horses, significantly higher serum T 4 was found in males, but the sex dependent differences of T 3 were less evident. T 3 and T 4 values in pregnant mares were significantly lower (P < 0.01) than in non-pregnant ones and in stallions. In contrast to the data in the literature, a significant decrease of T 4 was observed between the 7 th and 10 th month of pregnancy, while T 3 remained almost unchanged. The mean total serum T 3 and T 4 values in Lipizzans were in the normal range for warm-blooded horses and the age and sex-related fluctuations were in agreement with those for other horse breeds.

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“…These include: age (Irvine and Evans, 1975;Chen and Riley, 1981), breed (Malinowski et al, 1996), gender (Fazio et al, 2007), seasonal period (Flisiń ska-Bojanowska et al, 1991), altitude (Greene et al, 2002), changes in fertility (Gutierrez et al, 2002;Meredith and Dobrinski, 2004), daily rhythms (Morris and Garcia, 1983;Duckett et al, 1989), diet (Messer et al, 1995;Powell et al, 2000), training and exercise (Gonzá lez et al, 1998;Suwannachot et al, 2000) and disease, both severity and duration (Peeters et al, 2006).…”

Section: Introductionmentioning

confidence: 99%

Physiological variables of horses after road transport

Fazio

Medica

Cravana

et al. 2009

Animal

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In order to investigate the effects of short road transport stress on total and free iodothyronines, body weight (BW), rectal temperature and heart rate (HR) changes, 126 healthy stallions were studied in basal conditions, before and after transport. A total of 60 Thoroughbred and 66 crossbred stallions aged 4 to 15 years with previous travelling experience were transported by road in a commercial trailer for a period of about 3 to 4 h (distance under 300 km). Blood samples and functional variables were collected in each horse box, one week before loading and transport in basal conditions (control samples), one week later immediately before loading (pre-samples) and again after transport and unloading (about 3 to 4 h) in each new horse box, within 30 min of their arrival at the breeding stations (post-samples). Compared to the before-transport values, increases in circulating T 3 , T 4 and fT 4 levels ( P , 0.01) were observed after transport, irrespective of breed, but not for fT 3 levels. Lower T 4 and fT 4 levels were observed in basal II (at 1100 h) ( P , 0.01) than in basal I (at 0800 h) conditions and before transport. Thoroughbreds showed higher fT 3 ( P , 0.05) and fT 4 ( P , 0.01) levels after transport than crossbred stallions. No significant differences were observed for T 3 and T 4 . Compared to the before-transport values, significant increases in rectal temperature ( P , 0.01) and HR ( P , 0.05) were observed after transport. No differences were observed between basal I, II and before values for functional variables. Significant correlations between T 3 and rectal temperature, BW and HR were found. The results indicate that short road transport induces a preferential release of T 3 , T 4 and fT 4 hormones from the thyroid gland in relation to different breed, and an increase in rectal temperature and HR. No significant changes in BW were observed. No differences were observed in relation to different ages. The data obtained suggest that the stallion's thyroid hormones and functional variables may play an important role in assessing the effects of transport stress and a horse's coping strategy.Keywords: horse, iodothyronines, rectal temperature, heart rate, transport ImplicationsThe results of the current study suggest that the stallion's thyroid hormones and functional responses may play an important role in providing complementary information for the assessment of transport stress and animal coping strategies. In addition, the existence of a significant correlation between T 3 and rectal temperature, body weight and heart rate confirms that T 3 is the most metabolically active iodothyronine. Moreover, the importance of the thyroid hormone, namely triiodothyronine (T 3 ) generated locally by 5 0 -monodeiodinase (5 0 -MD) in the muscle tissue for metabolic needs during transport is still under investigation. In addition, when using circulating iodothyronine changes for the evaluation of transport stress the presence of peripheral 5 0 -MD should be further investigated. This may indicate that T 3 gen...

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Influence of pregnancy on diurnal and seasonal changes in cortisol, T3 and T4 levels in the mare blood serum

Cited by 42 publications

References 12 publications

Total and free iodothyronines profile in the donkey (Equus asinus) over a 12-month period

Total and free iodothyronines profile in the donkey (Equus asinus) over a 12-month period

Serum Triiodothyronine (T3) and Thyroxin (T4) Concentrations in Lipizzan Horses

Physiological variables of horses after road transport

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