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1

Czy norka została udomowiona?

100%
Decuypere E.
Zwierzęta Futerkowe
|
2014
|
nr 1
2
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Content available

Alterations in thyroid hormone physiology induced by temperature and feeding in newly hatched chickens

88%
Decuypere E.
Acta Physiologica Polonica
|
1988
|
tom 39
|
nr 1
3
Artykuł dostępny w postaci pełnego tekstu - kliknij by otworzyć plik
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Alterations in thyroid hormone physiology induced by temperature and feeding in newly hatched chickens

63%
Decuypere E., Kuhn E. R.
Acta Physiologica Polonica
|
1988
|
tom 39
|
nr 5-6
Decuypere E. and Kühn, E.R.: Alterations in thyroid hormone physiology induced by temperature and feeding in newly hatched chickens. Acta physiol. pol., 1988, 39(5-6): 330-394. In.the chicken the transition of a poikilotherm to a homeotherm reaction upon cold exposure takes place in the perinatal period between pipping and hatching However, newly hatched chicks cannot maintain their body temperature within narrow limits after cold exposure. The fact that relatively little attention was payed on the role of thyroid hormones in the thermoregulatory reaction to cold of young chicks was probably due to the hypothetically long latention time that was thought to be necessary to bring about changes in secretory activity by cold stimulation. However, more recently, rapid changes (within hours) of thyroid hormone concentrations upon cold exposure were described in the chickens and the quail. In this study, changes in circulating T₃ and T₄ concentrations upon cold exposure of young chicks during the first two weeks were followed, that means during the period wherein NST (non-shivering thermogenesis), if it exists at all, should be progressively replaced by ST (shivering thermo- genesis). Because of the importance of feeding condition on thyroid hormone levels, the experiments were carried out with and without a preceeding fasting period. In all experiments a short-term cold exposure of young chickens (1-11 days) fed ad lib decreased T₃ but increased T₄ levels while a reversed picture was found after short cold exposure of the fasted animals. However, after prolonged cold stimulus (15°C) of young chickens fed ad lib, plasma T₃ was also significantly elevated over that of controls whereas T₄ levels returned to normal values. A prolonged warm treatment (37°C) of young chickens fed ad lib resulted in significantly lower T₃ and higher T₄ concentrations. After a prolonged cold treatment no differences in T₄ or T₃ response upon TRH were found whereas the warm treatment abolished these responses upon TRH. However, a cold treatment at the jstage of incubation during which the hypothalamo-hypophyseal control of thyroid function is established (dag 10-l4) enhanced the T₄ response to TRH with a long lasting effect extending to the posthatch period. Since T₃ is thought to be the active form of thyroid hormones with regard to thermopoiesis we have studied more specifically the effect of. blocking peripheral Conversion of T₄ on thermoregulatory abilities in young chicks and the influence of temperature treatment on monodeiodination capacity. The lower rectal temperatures following the interference with the peripheral monodeiodination of T₄, the effect being more pronounced at the lower ambient temperature, are indicative for a preponderant role of T₃ on thermogenesis. Thyroid hormone levels are the integrated results of production and release on one hand and elimination, tissue utilization or peripheral interconversion on the other. Moreover, all these processes can be and are probably influenced by the relative amounts of T₄ and T₃ as well as by the ratio of free/bound hormones. Some exogenous factors, acting on thyroid hormone activity, could preferentially increase T₄ conversion while others could primarely act on enhanced gland secretion. Therefore further study on the underlying mechanisms of thyroid hormone activity control and regulation are needed.
4

Mechanical catching of broiler chickens is a viable alternative for manual catching from an animal welfare point of view

51%
Delezie E., Lips D., Lips R., Decuypere E.
Animal Science Papers and Reports. Supplement
|
2005
|
tom 23
|
nr 1
5

Nowoczesne metody oceny jakości skorup jaj

45%
De Baedremaeker J., De Ketelaere B., Bamelis F., Kemps B., Decuypere E.
Hodowca Drobiu
|
2005
|
nr 09
6

Extension of the animal needs index for laying hens with animal-related parameters

45%
Evers J., Lips D., De Tavernier J., Buyse J., Decuypere E.
Animal Science Papers and Reports. Supplement
|
2005
|
tom 23
|
nr 1
7
Content available remote

Effects of prenatal hypoxia on pulmonary vascular reactivity in chickens prone to pulmonary hypertension

33%
Zoer B., Kessels L., Vereijken A., De Mey J. G. R., Bruggeman V., Decuypere E., Blanco C. E., Villamor E.
Journal of Physiology and Pharmacology
|
2009
|
tom 60
|
nr 1
119-130
Among chickens, meat-producing broiler strains are highly prone to develop severe pulmonary hypertension (PH) that is accompanied by endothelial dysfunction in the conduit extrapulmonary arteries. We hypothesized that exposure to chronic prenatal mild hypoxia would accelerate PH and endothelial dysfunction in smaller intrapulpulmonary arteries from broiler chickens. Fertilized broiler and layer (White Leghorn, WL) eggs were incubated under normoxic or hypoxic conditions. Endothelium-dependent (tested with acetylcholine, ACh ) and -independent (tested with sodium nitroprusside, SNP) relaxations of the caudomedial intrapulmonary artery were studied on fetal day 19 and at 2 weeks post-hatch. The response to acute hypoxia in vitro was also studied in the 2 wk-old vessels. Relaxations induced by ACh and SNP were similar in broiler and layer chickens and were unaffected by chronic mild hypoxia during incubation. However, during in vitro acute hypoxia the broiler arteries showed a markedly enhanced contraction. Chronic prenatal hypoxia did not affect the response of intrapulmonary arteries to acute hypoxia. We conclude that early endothelial dysfunction is not present in the small pulmonary arteries of fast-growing broilers after incubation under normoxic or hypoxic conditions. The higher susceptibility of the broiler pulmonary arteries to acute hypoxia might, at least partially, explain the higher susceptibility to PH.
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