Seasonal changes in levels of growth hormone, somatomedin and thyroxine in free-ranging, semi-domesticated norwegian reindeer [Rangifertarandus tarandus (L.)]

Ringberg, Tata; Jacobsen, Endre; Ryg, Morten; Krog, John

doi:10.1016/0300-9629(78)90215-3

Cited by 27 publications

(12 citation statements)

References 17 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…According to McEwan & Whitehead (1970) the caloric intake is 35 to 45 % lower in winter than in summer. Ringberg et al (1978) reported that serum thyroxine (T4) values in free-ranging, semi-domestic reindeer calves were higher in July than in February. The T4 level, which reflects thyroic activity and thus is correlated directly with fasting metabolic rate and food intake, was relatively stable and unaffected by age and season during present study which is in agreement with observations on white tailed deer (Bubenik & Bubenik 1978).…”

Section: Discussionmentioning

confidence: 99%

Blood composition of the reindeer . II. Blood chemistry

Nieminen¹,

Timisjärvi²

1983

Ran

View full text Add to dashboard Cite

The blood chemical composition of 578 semi-domestic reindeer were investigated in respect to age, season, calving and nutrition in Northern Finland during 1973-79. The weight gain was maximally 400 g/day at an age of 4-8 weeks as also reflected by high serum thyroxine (T4), alkaline phosphatase (SAP), creatine phosphokinase (CPK) and blood glucose values. Low SAP activity in winter indicated a cessation of growth. The pH of the venous blood was 7.35 and the clotting activity very high (21 sec, 100 %) in summer and autumn. 15 protein bands and 15 fatty acids were discernible in reindeer serum. The total serum protein was 58 g/1 in the 20-day-old calf and 87 g/1 in adult hind in the autumn, the difference being caused by changes in globulins. The neonatal fluctuation of immunoglobulins suggests that the calf acquires its passive immunity soon after birth by the intestinal absorption of proteins and that its endogenous synthesis of gamma globulins begins in the 4th week of life. The serum total lipids (2.9 g/1), triglycerides (0.29 mmol/1) and cholesterol (1.6 mmol/1) were low in newborn calves and reached their adult levels at the age of 5 months (average 5.1 g/1, 0.4 mmol/1, 2.7 mmol/1, respectively). The young calves had higher serum cholesterol, total and free fatty acid, myristic acid and palmitic acid, but lower stearic and oleic acid values than adult hinds. The reindeer calf liberates considerable amounts of catecholamines during the first days after birth, but the postpartum dopamine-B-hydroxylase activity was rather low. The means of blood glucose (3.4-4.6 mmol/1), total serum proteins (63 - 87 g/1), albumin (39 - 43 g/1), total globulins (23 - 44 g/1), urea (5.7-9 mmol/1), total lipids (2.7 - 5.2 g/1), triglycerides (0.17 - 0.33 mmol/1), total fatty acids (0.89 - 1.54 g/1), calcium (2.2 - 2.6 mmol/1), inorganic phosphorus (1.6 - 2.2 mmol/1), magnesium (0.8 - 1.2 mmol/1) and copper (6.7 - 18 |Jmol/l) of free-grazing adult hinds were highest in summer and autumn and decreased during winter. The lowest means were measured for the starved hinds in early spring. The high serum urea and CPK, LDH and SAP activities reflected catabolism of the body proteins and tissue breakdown during starvation. Season and nutrition did not affect serum T4, creatinine, sodium and chloride values. High body weight and blood chemical values were measured for the hinds fed on silage and molasses in winter.

Poron veri. II. Veren kemia.

Abstract in Finnish / Yhteenveto: 578 puolivillin poron veren kemiallista koostumusta tutkittiin iån, vuodenajan, vasonnan ja ravitsemustilan suhteen vuosina 1973-79. Painon lisays oli suurimmillaan 400 g/vrk 4-8 viikon iassa ja sita kuvastivat myos korkeat seerumin tyroksiinin (T4), alkaalisen fosfataasin (SAP), kreatiinifosfokinaasin (CPK) ja veren sokerin arvot. Alhainen SAP aktiivisuus talvella osoitti kasvun pysahtymistå. Laskimoveren pH oli 7.35 ja veren hyytymiskyky (21 sek, 100 %) erittåin hyvå kesålla ja syksylla. Seerumista erotettiin 15 eri valku...

show abstract

Section: Discussionmentioning

confidence: 99%

Blood composition of the reindeer . II. Blood chemistry

Nieminen¹,

Timisjärvi²

1983

Ran

View full text Add to dashboard Cite

Poron veri. II. Veren kemia.

show abstract

“…In addition, measurement of the cyclical changes in metabolic rate of ungulates has often shown troughs to occur during winter (Silver et al 1969;Moen 1978), and tative, to conserve energy in pregnant females under conditions of environmental stress (Seal et al 1972). Such changes in appetite, growth, and basal metabolic rate may be under the control of the endocrine system (Seal et al 1972;Ringberg et al 1978) and have been linked to light-mediated seasonal fluctuations in hormone levels (Anderson et al 1974).…”

Section: Introductionmentioning

confidence: 97%

Annual variation in body composition of roe deer (Capreolus capreolus) in moderate environmental conditions

Hewison¹,

Angibault²,

Bideau³

et al. 1996

Can. J. Zool.

View full text Add to dashboard Cite

Patterns of growth and seasonal variation in body mass, kidney fat level, and bone marrow fat level were investigated in a roe deer population south of Paris. Size dimorphism was not apparent until the deer were 2 years of age, following a second period of rapid growth in males during spring-summer. No differences between the sexes in fat accumulation or in the periodicity of the annual fat cycle were observed. However, annual cycles of adult body mass were asynchronous between the sexes. Carcase mass was stable for much of the year, but one marked seasonal decline was observed in animals of each sex. For females (April -August) this reflected investment in late gestation and lactation, but among males (April-November) it was presumably linked to the costs of rutting. Contrary to reports for other ungulates, no over-winter decline in adult carcase mass, kidney fat level, or bone marrow fat level was observed, possibly because winters were mild. All four fat indices (kidney fat index, three bone-marrow fat indices) declined over spring -summer. This seasonal cyclicity does not match the energy requirements of reproductive activity, suggesting that the fat cycle is intrinsic, linked to seasonal metabolic variation in roe deer. We suggest that carcase mass is a more reliable index of condition in roe deer.RCsurnC : La croissance et les variations saisonnikres de la masse corporelles, de la graisse perirenale et de la graisse de la moelle osseuse ont ete etudies chez une population de Chevreuils. Le dimorphisme quant B taille n'apparait qu'B l'ige de 2 ans, B la suite d'une seconde periode de croissance rapide chez les miles au printemps et en ete. L'accumulation des graisses et la periodicite de leur cycle annuel ne diffkrent pas chez les miles et les femelles. Cependant les cycles annuels de la masse corporelle des adultes ne sont pas synchronises entre les deux sexes. La masse de la carcasse est relativement constante, mais une chute saisonnibe marquee se produit chez les deux sexes. Chez les femelles (avril-aoQt), elle correspond B l'investissement energetique important au moment de la gestation et de la lactation. Chez les miles (avril-novembre), elle est sans doute attribuable aux depenses energetiques liees au rut. Aucune diminution de la masse de la carcasse, de la graisse perirenale ou de la graisse de la moelle osseuse n'a ete observee chez les adultes au cours de l'hiver; ce resultat atypique peut Ctre dQ aux hivers doux. De plus, les quatre indices des graisses ont diminuk entre le printemps et 1'Cte. Cette cyclicite saisonnikre suggkre une origine intrinskque au cycle annuel des graisses, lie aux variations saisonnikres du metabolisme chez l'espkce. Nous recommandons l'utilisation de la masse de la carcasse comme indicateur de la condition physique chez le Chevreuil.

show abstract

“…T3 is also a contributing factor in growth hormone production (Glass et al 1987). Growth hormone and insulin-like growth factor 1 levels in the reindeer are lower in winter than in summer (Ringberg et al 1978, Suttie et al 1993). Observations on reindeer growth have shown that the growth is stopped in winter (Timisjärvi et al 1982, Suttie et al 1993.…”

Section: Discussionmentioning

confidence: 99%

“…Since then studies have dealt with serum T4 and T3 in the context of annual environ¬ mental rhythms in cervids. In the Norwegian reindeer, low serum T4 concentrations have been reported to occur from December to March (Ringberg et al 1978, Ringberg 1979, Ryg & Jacobsen 1981. In the Svalbard reindeer (Rangifer tarandus platyrhynchus) the drop in T4 levels in March is even more pronounced (Ringberg 1979).…”

Section: Discussionmentioning

confidence: 99%

Annual variations in serum thyroid-stimulating hormone and thyroid hormones and in their responses to thyrotrophin-releasing hormone in the reindeer

Timisjärvi

Ojutkangas²,

Eloranta³

et al. 1994

Journal of Endocrinology

View full text Add to dashboard Cite

The reindeer in its natural habitat is subject to great annual variations in ambient temperature, illumination and nutrition. To ascertain the effect of these environmental factors on thyroid function, serum thyroid-stimulating hormone (TSH), thyroxine (T4), tri-iodothyronine (T3) and reverse T3 (rT3) concentrations were measured four times a year (2 June, 8 October, 21 November, and 24 February) in 14 animals housed outdoors at latitude 69 degrees 10'N. They all showed statistically significant (P < 0.05) seasonal changes. Serum TSH and T4 were highest in February (623 +/- 30 ng/ml and 287 +/- 19 nmol/l respectively). TSH was lowest in October (318 +/- 47 ng/ml) and T4 in November (199 +/- 19 nmol/l). The T3 concentration was highest in November (3.0 +/- 0.3 nmol/l) and lowest in June (1.8 +/- 0.2 nmol/l). In contrast, rT3 was highest in June (3.6 +/- 1.2 nmol/l) and lowest in November (1.9 +/- 0.6 nmol/l). Thus, there was an inverse relationship between T3 and rT3 (linear regression r = -0.406, P < 0.01). TSH, T4, T3 and rT3 responses to exogenous thyrotrophin-releasing hormone (synthetic TRH; 500 micrograms i.m.) were determined in ten animals. The magnitude of their response to TRH was significantly (P < 0.05) dependent on the time of year. When compared with the control level all the parameters rose significantly (P < 0.05). The greatest rise in serum TSH occurred in October (219 +/- 151%) and the smallest in February (66 +/- 53%).(ABSTRACT TRUNCATED AT 250 WORDS)

show abstract

Seasonal changes in levels of growth hormone, somatomedin and thyroxine in free-ranging, semi-domesticated norwegian reindeer [Rangifertarandus tarandus (L.)]

Cited by 27 publications

References 17 publications

Blood composition of the reindeer . II. Blood chemistry

Blood composition of the reindeer . II. Blood chemistry

Annual variation in body composition of roe deer (Capreolus capreolus) in moderate environmental conditions

Annual variations in serum thyroid-stimulating hormone and thyroid hormones and in their responses to thyrotrophin-releasing hormone in the reindeer

Contact Info

Product

Resources

About