The Influence of High Environmental Temperature on Thyroid Size of Domestic Fowl ,

Huston, Till M.; Carmon, J. L.

doi:10.3382/ps.0410175

Cited by 33 publications

(18 citation statements)

References 11 publications

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“…The relationship between thyroid activity and temperature has long been known [3,39]. Huston and Carmon [40] reported that thyroid size and thyroid secretion rate decreased at high temperatures and increased at low temperatures. Joiner and Huston [41] also reported smaller thyroid sizes at high environmental temperatures and suggested that thyroid activity and subsequent metabolic rate might be reduced at high temperatures.…”

Section: Discussionmentioning

confidence: 99%

Effects of Vitamin C and Vitamin E on Lipid Peroxidation Status, Serum Hormone, Metabolite, and Mineral Concentrations of Japanese Quails Reared under Heat Stress (34º C)

Şahin¹,

Küçük²,

Şahin³

et al. 2002

International Journal for Vitamin and Nutrition Research

127

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This study was conducted to determine the effects of dietary vitamin C (L-ascorbic acid) and vitamin E (alpha-tocopherol acetate) on lipid peroxidation status measured as MDA and serum triiodothyronine (T3), thyroxine (T4), thyroid-stimulating hormone (TSH), adrenocorticotropic hormone (ACTH), as well as some other serum metabolite and mineral concentrations of Japanese quails reared under heat stress (34 degrees C). One hundred-eighty 10-day-old Japanese quails were randomly assigned to six treatment groups, three replicates of 10 birds each. Using a 2 x 3 factorial design, the birds received two levels of vitamin C (100 and 200 mg/kg of diet) or three levels of vitamin E (125, 250, or 500 mg/kg of diet). Greater dietary vitamin E and vitamin C resulted in a greater serum T3, T4, and TSH (p = 0.001), but lower ACTH (p = 0.001) concentrations. Serum concentrations of T4 and TSH increased to a greater extent by increasing dietary vitamin C when greater vitamin E levels were fed (interaction, p = 0.001). Serum glucose, urea, triglycerides, and cholesterol concentrations decreased (p = 0.001), while protein and albumin concentrations increased (p = 0.001) when both dietary vitamin C and vitamin E were increased. Serum activities of SGOT and SGPT were not influenced by dietary vitamin C and vitamin E (p > 0.43). However, serum activity of AP increased (p = 0.001) by increasing both dietary vitamin C and vitamin E. Increasing both dietary vitamin C and vitamin E caused an increase in serum concentrations of Ca, P, K (p = 0.001), Fe, and Zn (p = 0.01) but a decrease in serum concentrations of Na (p = 0.001) and Cu (p = 0.01). Interactions between vitamin C and vitamin E were detected for Ca, P, Na, and K (p = 0.001). Greater dietary vitamin C and vitamin E resulted in a greater serum and liver vitamin E, C, and A (p < or = 0.05), but lower MDA (p = 0.001) concentrations. Results of the present study conclude that supplementing a combination of dietary vitamin C (200 mg) and vitamin E (250-500 mg) offers a good management practice to reduce heat stress-related decreases in performance of Japanese quails.

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Section: Discussionmentioning

confidence: 99%

Effects of Vitamin C and Vitamin E on Lipid Peroxidation Status, Serum Hormone, Metabolite, and Mineral Concentrations of Japanese Quails Reared under Heat Stress (34º C)

Şahin¹,

Küçük²,

Şahin³

et al. 2002

International Journal for Vitamin and Nutrition Research

127

View full text Add to dashboard Cite

show abstract

“…It has been suggested that thyroid activity is affected by environmental temperature (McNabb and King, 1993;Yahav et al, 1997). Huston and Carmon (1962) reported the thyroid size and thyroid secretion rate decreased at high temperatures and increased at low temperatures. Joiner and Huston (1957) also reported smaller thyroid sizes at high environmental temperatures and suggested that at high temperatures the thyroid activity and subsequently metabolic rate might be reduced.…”

Section: Discussionmentioning

confidence: 99%

Effects of vitamin E and vitamin A supplementation on performance, thyroid status and serum concentrations of some metabolites and minerals in broilers reared under heat stress (32 degrees C)

Şahin¹,

Şahin²,

Küçük³

2001

Vet. Med. - Czech

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An experiment on Cobb-500 male broilers was conducted to evaluate the effects of vitamin E (α-tocopherolacetate), vitamin A (retinol), and their combination on broiler performance and serum concentrations of triiodothyronine (T 3 ), thyroxine (T 4 ), adrenocorticotropine hormone (ACTH) and some metabolite and mineral concentrations in broilers reared under heat stress (32°C). One day-old 120 broilers were randomly assigned to 4 treatment groups, 3 replications of 10 birds each. The birds were fed either a control diet or a control diet supplemented with either vitamin A (15 000 IU retinol/kg diet), vitamin E (250 mg α-tocopherol-acetate/kg diet), or a combination of vitamin A and E (15 000 IU retinol plus 250 mg of α-tocopherolacetate/kg diet). Considered separately or as a combination, supplemental vitamin A and vitamin E increased feed intake (P = 0.01) and live weight gain (P = 0.03). However, feed efficiency remained similar in all treatments (P = 0.18). Serum T 3 and T 4 concentrations were also higher (P ≤ 0.001) with vitamin A, vitamin E, and vitamin A plus vitamin E groups than those of the control. However, ACTH concentration in serum was lower (P ≤ 0.001) in supplemental dietary vitamin groups compared with control. Serum glucose, uric acid, triglyceride, and cholesterol concentrations decreased (P ≤ 0.001) while protein and albumin concentrations increased (P ≤ 0.001) when both dietary vitamin E and vitamin A were supplemented. Serum activities of serum glutamic oxalate transaminase (SGOT) and serum glutamic pyruvate transaminase (SGPT) were not influenced by dietary vitamin E, vitamin A nor by a combination of vitamin A and vitamin E (P > 0.72). However, serum activity of alkaline phosphatase (AP) increased (P ≤ 0.001) with supplemental dietary vitamin E, vitamin A, or a combination of vitamin A and vitamin E. In addition, supplemental dietary vitamin E and vitamin A resulted in an increase in serum concentrations of both Ca and P (P ≤ 0.001). In general, when a significant effect was found for a parameter, the magnitude of responses to vitamin supplements was greatest with the combination of vitamin A and vitamin E, rather than that of each vitamin supplement separately. The results of the present study show that supplementing a combination of dietary vitamin E and vitamin A offers a good management practice to reduce heat stress-related decreases in broiler performance.

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“…Under heat stress, an organism must reduce metabolic heat output, as the process of acclimatization is mainly associated with a low basal metabolic rate at high ambient temperatures. Previous studies found that the T 3 concentration decreased in chickens exposed either to acute or long-term heat stress, but the concentration increased at low temperatures (Huston and Carmon, 1962;Iqbal et al, 1990;Melesse et al, 2011). Thyroid activity and, subsequently, metabolic rate might also decrease at high temperatures (Jonier and Huston, 1957).…”

Section: Discussionmentioning

confidence: 99%

“…In chickens, there is an inverse relationship between the plasma concentration of T 3 and environmental temperature (May et al, 1986;Iqbal et al, 1990). The concentration of T 3 in serum decreases at high temperatures and increases at low temperatures (Huston and Carmon, 1962). Under high temperatures, broilers exhibited a significant increase in respiratory rate and cloacal temperature (da Silva et al, 2007).…”

Section: Introductionmentioning

confidence: 99%

Association of heat shock protein 70 gene polymorphisms with acute thermal tolerance, growth, and egg production traits of native chickens in Taiwan

et al. 2016

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Abstract. Heat stress is among the most challenging environmental conditions affecting commercial poultry. It severely affects growth and egg production, particularly in tropical and subtropical regions. This study aimed to examine physiological responses -including triiodothyronine (T 3 ) levels, enzymatic activity of creatine kinase (CK) and lactate dehydrogenase (LDH), respiratory rates, and cloacal temperature -to acute heat stress associated with different genotypes of the HSP70 gene and to evaluate the association of these polymorphisms with growth and egg production. Genotyping was performed by single-strand conformation polymorphism analysis. The polymorphisms identified were A258A, A258G, and G258G. Twenty 12-week old birds were randomly selected from each genotype and exposed to 40 • C ambient temperature for 1 h. Blood samples were collected at 0 and 1 h following heat stress. Respiratory rate and cloacal temperature were measured following 0, 30, and 60 min of exposure. After 1 h, the A258A genotype exhibited lower levels of CK activity and plasma T 3 . Neither respiratory rate nor cloacal temperature displayed a significant association with the genotypes. Body weight gain differed among the genotypes for males (F = 3.268, P = 0.041) and females (F = 14.029, P < 0.001), and the A258A genotype exhibited the greatest weight gain at 0-16 weeks of age for both genders. There were no significant differences among genotypes regarding egg weight at first egg or the number of eggs laid until 40 weeks of age. The A258A genotype displayed higher heat tolerance with no negative effects on growth performance and egg production.

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The Influence of High Environmental Temperature on Thyroid Size of Domestic Fowl ,

Cited by 33 publications

References 11 publications

Effects of Vitamin C and Vitamin E on Lipid Peroxidation Status, Serum Hormone, Metabolite, and Mineral Concentrations of Japanese Quails Reared under Heat Stress (34º C)

Effects of Vitamin C and Vitamin E on Lipid Peroxidation Status, Serum Hormone, Metabolite, and Mineral Concentrations of Japanese Quails Reared under Heat Stress (34º C)

Effects of vitamin E and vitamin A supplementation on performance, thyroid status and serum concentrations of some metabolites and minerals in broilers reared under heat stress (32 degrees C)

Association of heat shock protein 70 gene polymorphisms with acute thermal tolerance, growth, and egg production traits of native chickens in Taiwan

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