scholarly journals Effect of environmental temperature and feed intake on plasma concentration of thyroid hormones in dairy heifers

1991 ◽  
Vol 4 (3) ◽  
pp. 293-298
Author(s):  
B. P. Purwanto ◽  
M. Fujita ◽  
M. Nishbori ◽  
S. Yamamoto
Keyword(s):  
Plasma Concentration ◽  
Thyroid Hormones ◽  
Feed Intake ◽  
Environmental Temperature ◽  
Dairy Heifers

Effects of dietary protein sources on feed intake, growth and plasma thyroid hormones levels of Japanese flounder (Paralichthys olivaceus)

2011 ◽  
Vol 19 (6) ◽  
pp. 1061-1074 ◽  
Author(s):  
Jun-Ming Deng ◽  
Kang-Sen Mai ◽  
Qing-Hui Ai ◽  
Wen-Bing Zhang ◽  
Wei Xu ◽  
...  
Keyword(s):  
Thyroid Hormones ◽  
Feed Intake ◽  
Dietary Protein ◽  
Paralichthys Olivaceus ◽  
Japanese Flounder ◽  
Protein Sources

scholarly journals Invited review: Effects of milk ration on solid feed intake, weaning, and performance in dairy heifers

2011 ◽  
Vol 94 (3) ◽  
pp. 1071-1081 ◽  
Author(s):  
M.A. Khan ◽  
D.M. Weary ◽  
M.A.G. von Keyserlingk
Keyword(s):  
Feed Intake ◽  
Dairy Heifers ◽  
And Performance

Effects of environmental temperature on thyroid hormones in the barn owl (Tyto alba)

2006 ◽  
Vol 54 (3) ◽  
pp. 321-331 ◽  
Author(s):  
Á. Klein ◽  
Margit Kulcsár ◽  
Virág Krízsik ◽  
R. Mátics ◽  
P. Rudas ◽  
...  
Keyword(s):  
Plasma Level ◽  
Thyroid Hormones ◽  
Environmental Temperature ◽  
Barn Owl ◽  
Breeding Period ◽  
Tyto Alba ◽  
Lower Plasma ◽  
Cell Level ◽  
Trh Stimulation ◽  
Barn Owls

The basic patterns of thyroid hormones [thyroxine (T4) and 3,3',5-triiodothyronine (T3)] and the T4 and T3 responses induced by thyrotropin releasing hormone (TRH) are reported in captive female barn owls (Tyto alba) during the non-breeding period. The main findings of the study, conducted on a total of 10 owls, are as follow: (1) The thyroid gland of barn owl can be stimulated by the classical TRH stimulation test. (2) T3 response was much more pronounced both under cold (around 10°C) and warm (around 20°C) conditions, whereas T4 response ranged so widely that we could not point out any significant change in it. (3) Basal T3 plasma level was significantly (p = 0.036) higher in birds exposed to cold temperature, and they responded to TRH treatment with a lower plasma T3 elevation than the birds kept in a warm chamber. This pattern, however, cannot be explained by increased food intake, but is in agreement with the fact that enhanced T3 level may account for higher avUCP mRNA expression, which results in higher heat production on the cell level. From the results it is concluded that altering T3 plasma level plays a significant role in cold-induced thermoregulation.

The effect of ambient temperature on feed intake and diet selection in growing lambs

1992 ◽  
Vol 1992 ◽  
pp. 166-166
Author(s):  
M.R. Cropper ◽  
D.P. Poppi
Keyword(s):  
Ambient Temperature ◽  
Protein Content ◽  
Feed Intake ◽  
Free Choice ◽  
Environmental Temperature ◽  
Diet Selection ◽  
High Ambient Temperature

Lambs are known to change their feed intake in relation to environmental temperature (Blaxter, 1962). However, their ability to select a non-limiting diet, when free-choice fed, has only been investigated in a thermoneutral environment (Cropper, 1987). The aim of this experiment was to test the idea that, at low and high ambient temperature, (a) feed intake would increase in the cold and decrease in the hot, relative to a thermoneutral control, and that (b) the protein content of the diet selected would be lower and higher respectively.

scholarly journals Endocrine And Metabolic Adaptations Of Calves To Extra-Uterine Life

2015 ◽  
Vol 65 (3) ◽  
pp. 297-318 ◽  
Author(s):  
Kirovski Danijela
Keyword(s):  
Energy Metabolism ◽  
Thyroid Hormones ◽  
Energy Intake ◽  
Environmental Temperature ◽  
Endocrine System ◽  
Energy Sources ◽  
Functional Changes ◽  
Metabolic Adaptations ◽  
Newborn Calves ◽  
And Control

AbstractThe transition from intra- to extra-uterine life is one of the greatest physiological challenges that occur in the life of animals. Immediately after birth, newborn calves have to adapt to new environmental and feeding conditions. Namely, at birth a break of the thermal balance occurs, since calves abruptly pass from a 38.8°C temperaturein uteroto an environmental temperature that is generally lower than 20°C. Additionally, at birth, the energy intake shifts from a continuous parenteral supply of nutrients (mainly glucose) to discontinuous colostrum and milk intake with lactose and fat as the main energy sources. Therefore, the most important issues related to metabolic changes during the transition from intra- to extra-uterine life are related to maintaining the homoeothermic conditions and control of energy metabolism. Those metabolic adaptations are under control of the endocrine system that is relatively mature at birth, but still requires morphological and functional changes after birth. Key hormones whose concentrations are significantly changed around birth and are involved in an adequate adaptation of calves to extra-uterine life are those related to stress at birth (cortisol and cathecholamines), glucoregulatory processes (insulin and glucagon), thermogenesis (thyroid hormones) and growth (IGF axis).

Effect of drinking-water temperature on heat balance and thermoregulatory responses in dairy heifers

1996 ◽  
Vol 47 (4) ◽  
pp. 505 ◽  
Author(s):  
BP Purwanto ◽  
M Harada ◽  
S Yamamoto
Keyword(s):  
Drinking Water ◽  
Water Temperature ◽  
Respiration Rate ◽  
Rectal Temperature ◽  
Heat Balance ◽  
Heat Dissipation ◽  
Environmental Temperature ◽  
Night Time ◽  
Dairy Heifers ◽  
Thermoregulatory Responses

A study was made to determine the effect of heat dissipation from drinking water (8 kg at 10, 20, or 30�C) on the heat balance and thermoregulatory responses of 4 dairy heifers housed at 24, 29, and 34�C. No effect of drinking-water temperature on heat production or heart rate was found. Respiration rate, mean skin-surface temperature, and rectal temperature all decreased with decreasing drinking-water temperature. Rectal temperature reached a minimum 20 min after watering. The respiration rate, skin temperature, and rectal temperature returned to prior-to-watering values 120-180 min after watering. The cooling efficiency of drinking water was about 40%, and decreased at high environmental temperature, because the cooling potential was used initially in depressing heat loss responses. It is suggested that in order to eliminate excessive heat load, chilled drinking water could be effective during the night time when the environmental temperature is lowest.

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