Plasma total T3 and T4 concentrations in goats at different physiological stages, as affected by the energy intake

Todini, Luca; Malfatti, Alessandro; Valbonesi, Alessandro; Trabalza‐Marinucci, Massimo; Debenedetti, A.

doi:10.1016/j.smallrumres.2005.11.018

Cited by 97 publications

(69 citation statements)

References 19 publications

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“…Goats with a slightly higher energy intake showed higher plasma TH concentrations during the second half of gestation, and the decrease of plasma TH in mid-and late gestation was attenuated and delayed (Todini et al, 2007). These effects suggested that energy balance could play a major role in affecting the decrease in plasma TH levels usually observed at the end of gestation in small ruminants (see above).…”

Section: Nutrition Effectsmentioning

confidence: 92%

“…Plasma T3 and T4 levels in goats at mid-pregnancy rised compared with the low levels observed just before oestrus and mating. Then, during the second half of pregnancy, maternal hormone levels progressively decrease, probably because of the negative energy balance (Todini et al, 2007). This is supported by the lower maternal serum TH levels (more marked and significant for T4) observed in twin-bearing does, that are often characterised by negative energy balance, compared with aborted and single-bearing does (whose energy balance is usually less negative) (Manalu et al, 1997).…”

Section: Changes During Oestrus Pregnancy Peri-parturient Period Anmentioning

confidence: 95%

“…These effects suggested that energy balance could play a major role in affecting the decrease in plasma TH levels usually observed at the end of gestation in small ruminants (see above). Furthermore, in the higher energy diet-fed goats, the variations of circulating T4 during different physiological states were not significant (Todini et al, 2007). Recently, no significant difference in the rates of type II and type III deiodinase activity in the skin or in blood TH concentrations was found between cashmere goats maintained at a different plane of nutrition (Rhind et al, 2006).…”

mentioning

confidence: 94%

“…Appropriate thyroid gland function and activity of thyroid hormones (TH) are considered crucial to sustain the productive performance in domestic animals (growth, milk, hair fibre production) and circulating TH can be considered as indicators of the metabolic and nutritional status of the animals (Riis and Madsen, 1985;Todini et al, 2007). Changes of blood TH concentrations are an indirect measure of the changes in thyroid gland activity.…”

Section: Introductionmentioning

confidence: 99%

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Thyroid hormones in small ruminants: effects of endogenous, environmental and nutritional factors

Todini

2007

Animal

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Appropriate thyroid gland function and thyroid hormone activity are considered crucial to sustain the productive performance in domestic animals (growth, milk or hair fibre production). Changes of blood thyroid hormone concentrations are an indirect measure of the changes in thyroid gland activity and circulating thyroid hormones can be considered as indicators of the metabolic and nutritional status of the animals. Thyroid hormones play a pivotal role in the mechanisms permitting the animals to live and breed in the surrounding environment. Variations in hormone bioactivity allow the animals to adapt their metabolic balance to different environmental conditions, changes in nutrient requirements and availability, and to homeorhetic changes during different physiological stages. This is particularly important in the free-ranging and grazing animals, such as traditionally reared small ruminants, whose main physiological functions (feed intake, reproduction, hair growth) are markedly seasonal. Many investigations dealt with the involvement of thyroid hormones in the expression of endogenous seasonal rhythms, such as reproduction and hair growth cycles in fibre-producing (wool, mohair, cashmere) sheep and goats. Important knowledge about the pattern of thyroid hormone metabolism and their role in ontogenetic development has been obtained from studies in the ovine foetus and in the newborn. Many endogenous (breed, age, gender, physiological state) and environmental factors (climate, season, with a primary role of nutrition) are able to affect thyroid activity and hormone concentrations in blood, acting at the level of hypothalamus, pituitary and/or thyroid gland, as well as on peripheral monodeiodination. Knowledge on such topics mirror physiological changes and possibly allows the monitoring and manipulation of thyroid physiology, in order to improve animal health, welfare and production.Keywords: goats, nutrition, seasons, sheep, thyroid hormones IntroductionAppropriate thyroid gland function and activity of thyroid hormones (TH) are considered crucial to sustain the productive performance in domestic animals (growth, milk, hair fibre production) and circulating TH can be considered as indicators of the metabolic and nutritional status of the animals (Riis and Madsen, 1985;Todini et al., 2007). Changes of blood TH concentrations are an indirect measure of the changes in thyroid gland activity. Many papers report marked seasonal variation in thyroid activity and in blood TH concentration. These hormone variations are particularly important in the free-ranging and grazing animals, whose main physiological functions (feed intake, reproduction, hair growth) are markedly seasonal. This is the case of small ruminants traditionally reared. Such variations in hormone concentration, in fact, allow the animals to adapt their metabolic balance to different environmental conditions, variations in nutrient requirements and availability, and to homeoretic changes during different physiological stages.The present paper aims to re...

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Section: Nutrition Effectsmentioning

confidence: 92%

Section: Changes During Oestrus Pregnancy Peri-parturient Period Anmentioning

confidence: 95%

mentioning

confidence: 94%

Section: Introductionmentioning

confidence: 99%

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Thyroid hormones in small ruminants: effects of endogenous, environmental and nutritional factors

Todini

2007

Animal

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186

137

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“…Lower blood T 3 concentration could reduce the rate of oxidation and the rate of continuous breakdown and formation of protein and fat in the most, if not all mammary tissue (Riis and Madsen, 1985). Todini et al (2007) showed that during gravity in all mammalian species thyroid activity and blood hormone levels were increased.…”

mentioning

confidence: 99%

Blood Metabolic Profile and Certain Hormones Concentrations in Egyptian Buffalo During Different Physiological States

Ashmawy¹

2015

Asian J. of Animal and Veterinary Advances

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The aim of this study is to determine the influence of physiological status on blood metabolic profile, enzymes and some hormones concentration in the blood of Egyptian buffalo. Investigations were carried out on 24 buffalo (12 pregnant buffalo cows on the 60th day prior to parturition and 12 lactating buffalo cow from 10th day of lactation during winter feeding season). The buffalo cow was average 3 years old and healthy. Buffalo were fed according to Mehlet Moussa Experimental Station which belongs to Animal Production Research Institute, north part of the Nile Delta, Egypt. The present study indicated that there was drop in calcium, sodium, phosphorus and potassium levels during early stage of lactation than pregnant period buffaloes, the opposite trend recorded in chloride levels. The concentrations of plasma glucose, urea, cholesterol, triglycerides and total protein were higher during pregnant period than in lactation period, the opposite trend recorded in creatinine level. The present study indicated that, the blood enzymes (AST, ALT and AlP) activities were insignificantly higher during pregnant period than in lactation period. The concentrations of plasma IGF-1, thyroid hormones and leptin were higher during pregnant period than in lactation period.

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The Comparing of Hybrid and Purebred Sheep’s Endocrine Profile

Khusnetdinova

Иолчиев

Prytkov

et al. 2021

Fundamental and Applied Scientific Research in the Development of Agriculture in the Far East (AFE-2021)

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Plasma total T3 and T4 concentrations in goats at different physiological stages, as affected by the energy intake

Cited by 97 publications

References 19 publications

Thyroid hormones in small ruminants: effects of endogenous, environmental and nutritional factors

Thyroid hormones in small ruminants: effects of endogenous, environmental and nutritional factors

Blood Metabolic Profile and Certain Hormones Concentrations in Egyptian Buffalo During Different Physiological States

The Comparing of Hybrid and Purebred Sheep’s Endocrine Profile

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