Postnatal changes in circulating concentrations of growth hormone, somatomedin C and thyroid hormones in pigs

Scanes, Colin G.; Lazarus, Douglas; Bowen, S. J.; Buonomo, Frances C.; Gilbreath, Rex L.

doi:10.1016/0739-7240(87)90021-x

Cited by 40 publications

(21 citation statements)

References 17 publications

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“…The reasons for the species differences in this sexuaf dimorphism are unknown. In the present study, a portion -0.22 -0.54 DISCUSSION The age-dependent increases in serum IGF-I levels found in the calftrial are in accordance with previous findings in mice (Blair et al 1987), rats (Handelsman et al 1987), pigs (Scanes et al 1987), calves (Lund-Larsen et al 1977;Holland et al 1988;Abribat et al 1990), chickens (Goddard et al 1988) and humans (Furlanetto et al 1977;Silbergeld et al 1986). With the exception of the report by Lund-Larsen etal.…”

supporting

confidence: 81%

Profiles of serum IGF-I concentrations in calves from birth to eighteen months of age and in cows throughout the lactation Cycle

Kerr¹,

Manns²,

Laarveld³

et al. 1991

Can. J. Anim. Sci.

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supporting

confidence: 81%

Profiles of serum IGF-I concentrations in calves from birth to eighteen months of age and in cows throughout the lactation Cycle

Kerr¹,

Manns²,

Laarveld³

et al. 1991

Can. J. Anim. Sci.

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“…The muscle and fat may act via endocrine mechanisms to stimulate lean tissue growth or may reflect somatic tissue production of IGF-1, which in turn acts as a paracrine growth factor. IGF-1 is used as a physiological criterion for genetic animal improvement, as the IGF-1 concentration increases steadily during animal growth, in contrast to the large circadian variation of GH (Scanes et al, 1987). IGF-1 is an essential growth factor for cell growth and development (Liu and LeRoith, 1999).…”

Section: Introductionmentioning

confidence: 99%

Effect of plant extracts on growth performance and insulin-like growth factor 1 secretion in growing pigs

2015

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-The objective of the present study is to evaluate the effects of plant extracts on growth performance, nutrient digestibility, and immune blood characteristics in growing pigs. A total of 80 [(Landrace × Yorkshire) × Duroc] pigs with an initial body weight (BW) of 27.31±2.15 kg were used in a 6-wk experiment. Pigs were allotted to one of four treatments (1 -Control (CON) (basal diet); 2 -PE1 (CON + 0.05% plant extracts); 3 -PE2 (CON + 0.10% plant extracts); and 4 -PE3 (CON + 0.15% plant extracts)) in a randomized complete block design according to sex and initial BW. The PE1 and PE2 treatments provided a greater average daily gain than the CON treatment. From weeks 0 to 6 the pigs fed diets PE2 and PE3 showed greater apparent total tract digestibility of dry matter than those fed the CON diet. Pigs fed the plant-extract treatments had a reduction in total mercaptan emission on day 3 compared with control treatment. On day 5, fecal acetic acid content was decreased with increased blood WBC (white blood cells) and lymphocyte counts and serum IGF-1concentration by plant extract supplementation compared with the control treatment. All the results showed a 95% significance level. Supplementation of plant extracts can improve growth performance and nutrient digestibility in growing pigs, decrease fecal gas emission, and increase immune components such as WBC and lymphocytes, and serum IGF-1 concentration in growing pigs.

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“…Compared with other studies on thyroid status in pigs, the plasma content of thyroxin in this study was within the normal range (Benjaminsen and Dishington 1981;Scanes et al 1987;Spencer et al 1989). The free fraction of circulating thyroxin is the biologically active fraction and is considered to exert the main influence on metabolic control (Ekins et al 1978;Kaneko 1989).…”

Section: Discussionmentioning

confidence: 56%

Behavioural and physiolgical thermoregulation in groups of pregnant sows housed in a kennel system at low temperatures

Andersen¹,

Bøe²

2000

Can. J. Anim. Sci.

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K. 2000. Behavioural and physiological thermoregulation in groups of pregnant sows housed in a kennel system at low temperatures. Can. J. Anim. Sci. 80: 1-8. The behavioural and physiological responses of pregnant sows to cold exposure in a kennel system were investigated. Ten groups, each of six pregnant sows, were housed over winter in a non-insulated building containing kennels. Lying posture, social thermoregulation, time spent inside the kennels and general activity were recorded in three 48-h periods with different diurnal room temperatures: cold (-9 to -1°C), medium (0 to +3°C) and warm (+4 to +9°C). Blood samples were collected from two of the groups, and the concentrations of glucose, free fatty acids, total thyroxine (TT4) and free thyroxine (FT4) in the plasma were determined.The air temperature difference in between the surrounding room and the kennels increased with decreasing room temperature with a maximum of 12°C at a room temperature of -10°C. Activity level did not differ significantly between temperature periods (30.6 ± 1.1%). At all temperature periods, the sows spent between 80 and 90% of their time inside the kennels. The sows spent significantly more time eating/manipulating straw in the cold than in the medium and warm period (P = 0.038). Time spent lying on the belly in body contact with other sows inside the kennel increased significantly from 15.6% in the warm period to 20.3% in the medium period and 44.9 % in the cold period (P = 0.001). The two highest ranked individuals (rank 1 and 2) tended to spend more time inside the kennel than sows with rank order 4 to 6 (P = 0.059). At a diurnal room temperature of -8 o C, the sows had a significantly higher level of (FT4) in the plasma than at higher temperatures (P < 0.001). The relationship between the other blood parameters and diurnal room temperature was difficult to interpret.This study suggests that kennels with straw give the sows good protection from climatic conditions, and that social thermoregulation in a micro environment is an important strategy to cope with low temperatures. At a diurnal room temperature of -8°C, however, the increase of FT4 in the plasma may indicate an increased metabolism and thus an increased energy requirement. Since low-ranking individuals spent less time inside the kennels than high-ranking sows, they probably had a greater heat loss. For practical application of the system, the kennel should thus be designed in a way that allows all individuals to get inside.Key words: Pregnant sows, thermoregulation, physiology, kennel, social rank order Andersen, I. L., Bøe, K. E. et Hove, K. 2000. Thermorégulation comportementale et physiologique dans des groupes de truies gravides logées en système de stabulation libre à logettes. Can. J. Anim. Sci. 80: 1-8. Nous avons comparé les réponses d'ordre comportementale et physiologique à l'exposition au froid de truies gestantes logées en système de stabulation libre à logettes. Dix groupes, faits de 6 truies chacun, étaient logés tout l'hiver dans un bâtiment non isolé...

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Postnatal changes in circulating concentrations of growth hormone, somatomedin C and thyroid hormones in pigs

Cited by 40 publications

References 17 publications

Profiles of serum IGF-I concentrations in calves from birth to eighteen months of age and in cows throughout the lactation Cycle

Profiles of serum IGF-I concentrations in calves from birth to eighteen months of age and in cows throughout the lactation Cycle

Effect of plant extracts on growth performance and insulin-like growth factor 1 secretion in growing pigs

Behavioural and physiolgical thermoregulation in groups of pregnant sows housed in a kennel system at low temperatures

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