Habituation by the immature fowl in response to repeated injections of corticotrophin

Freeman, B. M.; Manning, A.C.C.; Flack, I.H.

doi:10.1080/00071667908416598

Cited by 32 publications

(4 citation statements)

References 27 publications

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“…after an injection of corticotrophin (Freeman et al, 1979). These observations are consistent with the hypothesis that the physiological state of an animal at a specific time does not indicate the degree to which it is being stressed (Selye, 1936).…”

Section: Introductionsupporting

confidence: 89%

Effects of Population Density on the Growth, Organ Weights, and Plasma Corticosterone of Young Broiler Chicks

Pesti

Howarth

1983

Poultry Science

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Two trials were conducted with broiler chicks to determine the effects of population density on the growth, feed efficiency, and several physiological parameters associated with stress in birds. Chicks were brooded in batteries at 116, 232, 348, and 697 cm2/chick. Chicks brooded at 348 cm2/chick grew and utilized feed significantly better than those brooded at 697 cm2/chick during the first week. For maximum growth and feed efficiency, 116 cm2/chick was adequate for the first week; 232 cm2/chick was adequate during the second and third weeks. Increasing cage density significantly decreased percentage heart and spleen weights (g/100 g body weight) and plasma corticosterone at 3 weeks.

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Section: Introductionsupporting

confidence: 89%

Effects of Population Density on the Growth, Organ Weights, and Plasma Corticosterone of Young Broiler Chicks

Pesti

Howarth

1983

Poultry Science

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“…The decrease in CORT production after 4 d may be attributed to adaptation (Freeman et al, 1979;Davison et al, 1985); however, it is most likely attributable to a decline in the potency of ACTH during the week of treatment period. The changes observed in plasma GLU may have resulted from the CORT.…”

Section: Discussionmentioning

confidence: 88%

Continuous Infusion of Adrenocorticotropin Elevates Circulating Lipoprotein Cholesterol and Corticosterone Concentrations in Chickens ,

et al. 1996

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The purpose of the present study was to investigate the effects of elevated corticosterone (CORT) on circulating lipoprotein cholesterol during a 1-wk period. For this study, 15 commercial broilers were randomly assigned to one of three treatment groups. Group 1 served as the control (CON) and received no treatment, whereas Groups 2 and 3 received subcutaneous mini-osmotic pumps containing either physiological saline (PS) or adrenocorticotropin (ACTH), respectively. The ACTH was delivered at a rate of 8 IU/kg of BW/d. Blood samples were taken at Time 0 (before implants) and on Days 2, 4, and 7 postimplantation. Continuous infusion of ACTH increased plasma glucose, cholesterol, triglycerides, very low density lipoprotein cholesterol, low density lipoprotein cholesterol, high density lipoprotein cholesterol, and CORT during the postimplantation period. The group treated with ACTH also exhibited a decrease in BW during the last 2 sampling d. There were no differences in any of the serum constituents measured between CON and PS birds, which suggest that CON birds can serve as useful controls. These data suggest that birds given a continuous infusion of ACTH at 8 IU/kg of BW/d can experience changes in plasma lipoprotein cholesterol concentrations along with changes in other blood parameters and may serve as a useful model in accelerated lipoprotein production.

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“…It has been shown that prolonged adrenal stimulation leads to its exhaustion and reduced circulating levels of CS (Puvadolpirod & Thaxton, 2000). However, Freeman et al (1979) reported that this decline was due to habituation in response to repeated stimulus.…”

Section: Discussionmentioning

confidence: 89%

Efficacy of lactobacilli to normalize production of corticosterone induced by unpleasant handling of broilers

Meimandipour¹,

Soleimanifarjam²,

Hair-Bejo³

et al. 2011

SA J. An. Sci.

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A study was conducted to investigate the effect of two Lactobacillus strains on hypothalamus pituitary adrenal (HPA) axis activity induced by supposedly unpleasant handling (UH) of broiler chickens. The three treatments were: (1) non-handled chicks fed basal diet (control); (2) unpleasantly handled-chicks fed basal diet (UH-BD) and (3) unpleasantly handled-chicks fed basal diet supplemented with the probiotic, lactobacilli (UH-BDL). Chicks were exposed to UH from days 1 to 21. Treatment UH-BDL received probiotics in their diet for the whole experimental period. Blood corticosterone (CS) concentrations were monitored at 14, 28, 35 and 42 days of age and selected caecal bacterial groups were enumerated in 14-day old birds. Unpleasant handling significantly increased blood CS concentrations at 14 and 28 days of age. Blood CS concentration decreased with age over the course of the experimental period. Lactobacillus supplementation did not reduce blood CS concentration in broilers in the UH-BDL treatment. Moreover, the UH treatment did not alter caecal bacterial numbers in the 14-day old broilers while the probiotic numerically increased total anaerobes and lactobacilli. Overall, it seems as if the efficacy of lactobacilli to modulate stress-related high HPA-axis activity depends on gastrointestinal tract microbial alteration. However, Lactobacillus salivarius subsp. salicinius JCM 1230 and L. agilis JCM 1048 were able to reestablish a proper microbial balance in the caecum of the chickens. ________________________________________________________________________________

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Habituation by the immature fowl in response to repeated injections of corticotrophin

Cited by 32 publications

References 27 publications

Effects of Population Density on the Growth, Organ Weights, and Plasma Corticosterone of Young Broiler Chicks

Effects of Population Density on the Growth, Organ Weights, and Plasma Corticosterone of Young Broiler Chicks

Continuous Infusion of Adrenocorticotropin Elevates Circulating Lipoprotein Cholesterol and Corticosterone Concentrations in Chickens ,

Efficacy of lactobacilli to normalize production of corticosterone induced by unpleasant handling of broilers

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