Jeffrey D. Armstrong

Works (13)

Updated: March 10th, 2025 12:14

1999 article

Effects of active immunization against growth-hormone releasing factor on puberty and reproductive development in gilts.

Swanchara, K. W., Armstrong, J. D., & Britt, J. H. (1999, January 1). Journal of Animal Science, Vol. 77, pp. 1807–1814.

By: K. Swanchara n, J. Armstrong n & J. Britt n 

MeSH headings : Animals; Female; Growth Hormone / blood; Growth Hormone-Releasing Hormone / immunology; Growth Hormone-Releasing Hormone / physiology; Humans; Insulin-Like Growth Factor I / metabolism; Recombinant Proteins / immunology; Reproduction / immunology; Sexual Maturation / immunology; Swine / growth & development; Swine / immunology; Vaccination
topics (OpenAlex): Reproductive Physiology in Livestock; Effects of Environmental Stressors on Livestock; Animal Behavior and Welfare Studies
TL;DR: Results indicate that alterations in the somatotropic axis at 1 mo of age can influence reproductive development in pubertal gilts. (via Semantic Scholar)
Sources: NC State University Libraries, NC State University Libraries
Added: August 6, 2018

1997 journal article

Developing course materials using the World Wide Web

NACTA Journal, 41(2), 10–15.

By: M. O'Kane & J. Armstrong

Source: NC State University Libraries
Added: August 6, 2018

1997 journal article

Effects of acute endotoxemia on serum somatotropin and insulin like growth factor I concentrations in prepubertal gilts

American Journal of Veterinary Research, 58(9), 1010–1013.

By: W. Hevener, G. Almond , J. Armstrong & R. Richards

Source: NC State University Libraries
Added: August 6, 2018

1995 article

Recombinant bovine somatotropin increases milk yield and calf gain in diverse breeds of beef cattle: associated changes in hormones and indices of metabolism.

Armstrong, J. D., Harvey, R. W., Poore, M. A., Simpson, R. B., Miller, D. C., Gregory, G. M., & Hartnell, G. F. (1995, January 1). Journal of Animal Science.

By: J. Armstrong n, R. Harvey n, M. Poore n, R. Simpson n, D. Miller n, G. Gregory n, G. Hartnell n

MeSH headings : Animals; Animals, Newborn / growth & development; Blood Glucose / analysis; Body Weight / physiology; Cattle / genetics; Cattle / metabolism; Cattle / physiology; Fatty Acids, Nonesterified / blood; Female; Growth Hormone / administration & dosage; Growth Hormone / pharmacology; Injections, Subcutaneous / veterinary; Insulin / blood; Insulin-Like Growth Factor I / analysis; Lactation / drug effects; Lactation / physiology; Male; Milk / metabolism; Pharmaceutical Vehicles; Pregnancy; Pregnancy Rate; Recombinant Proteins / administration & dosage; Recombinant Proteins / pharmacology; Weight Gain / drug effects; Weight Gain / physiology
topics (OpenAlex): Reproductive Physiology in Livestock; Ruminant Nutrition and Digestive Physiology; Growth Hormone and Insulin-like Growth Factors
TL;DR: Administration of bST before or after the breeding season increased milk yield and subsequent calf weaning weight when initiated after 100 d postpartum and increased IGF-I, insulin, glucose, and nonesterified fatty acids as anticipated. (via Semantic Scholar)
Source: NC State University Libraries
Added: August 6, 2018

1994 article

Concentrations of hormones and metabolites, estimates of metabolism, performance, and reproductive performance of sows actively immunized against growth hormone-releasing factor

Armstrong, J. D., Coffey, M. T., Esbenshade, K. L., Campbell, R. M., & Heimer, E. P. (1994, June 1). Journal of Animal Science.

By: J. Armstrong n, M. Coffey n, K. Esbenshade n, R. Campbell  n & E. Heimer n

MeSH headings : Adipose Tissue / metabolism; Animals; Animals, Suckling / growth & development; Antibodies / blood; Blood Glucose / metabolism; Embryonic and Fetal Development / physiology; Fatty Acids, Nonesterified / blood; Female; Growth Hormone / blood; Growth Hormone-Releasing Hormone / immunology; Immunization / veterinary; Immunization, Secondary / veterinary; Insulin / blood; Insulin-Like Growth Factor I / analysis; Lactation / blood; Mammary Glands, Animal / metabolism; Pregnancy; Reproduction; Serum Albumin / immunology; Swine / blood; Swine / metabolism; Swine / physiology; Thyroxine / blood
topics (OpenAlex): Animal Virus Infections Studies; Animal Behavior and Welfare Studies; Reproductive Physiology in Livestock
TL;DR: Sows actively immunized against GRF weighed less and had more backfat at d 110 of gestation than HSAi sows; in vitro glucose oxidation and lipogenic rate of adipose tissue were greater (P < .05 for treatment x day interaction) in GRFi than in HSAo sows at d110 of gestation; across treatment, mammary gland oxidation of glucose and glucose clearance rates increased and adipose tissues utilization of glucose decreased. (via Semantic Scholar)
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Source: NC State University Libraries
Added: August 6, 2018

1993 article

Effect of feed restriction on serum somatotropin, insulin-like growth factor-I-(IGF-I) and IGF binding proteins in cyclic heifers actively immunized against growth hormone releasing factor

Armstrong, J. D., Cohick, W. S., Harvey, R. W., Heimer, E. P., & Campbell, R. M. (1993, October 1). Domestic Animal Endocrinology.

By: J. Armstrong n, W. Cohick  n, R. Harvey n, E. Heimer n & R. Campbell  n

MeSH headings : Animals; Carrier Proteins / blood; Cattle / metabolism; Electrophoresis, Polyacrylamide Gel; Estrus / metabolism; Fatty Acids, Nonesterified / blood; Female; Food Deprivation / physiology; Growth Hormone / blood; Growth Hormone-Releasing Hormone / immunology; Growth Hormone-Releasing Hormone / physiology; Insulin / blood; Insulin-Like Growth Factor Binding Protein 2; Insulin-Like Growth Factor I / analysis; Random Allocation; Somatomedins / analysis; Vaccination
topics (OpenAlex): Growth Hormone and Insulin-like Growth Factors; Reproductive Physiology in Livestock; Ruminant Nutrition and Digestive Physiology
TL;DR: The increase in serum ST levels observed during feed restriction was blocked by active immunization against GRF, however, feed restriction resulted in decreased serum IGF-I in GRFi heifers in spite of initial low levels of IGF-i (due to GRFi). (via Semantic Scholar)
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Source: Web Of Science
Added: August 6, 2018

1991 article

Changes in growth hormone and luteinizing hormone following acute or chronic administration of an opioid agonist, FK33-824, in wethers.

Armstrong, J. D., & Spears, J. W. (1991, January 1). Journal of Animal Science.

By: J. Armstrong n & J. Spears  n

MeSH headings : Animals; D-Ala(2),MePhe(4),Met(0)-ol-enkephalin / administration & dosage; D-Ala(2),MePhe(4),Met(0)-ol-enkephalin / pharmacology; Energy Metabolism; Feces / chemistry; Growth Hormone / blood; Infusions, Intravenous / veterinary; Injections, Intravenous / veterinary; Injections, Subcutaneous / veterinary; Luteinizing Hormone / blood; Male; Nitrogen / metabolism; Sheep / metabolism
topics (OpenAlex): Neuropeptides and Animal Physiology; Pharmacological Effects and Assays; Adipose Tissue and Metabolism
TL;DR: Average LH was decreased consistently by FK33-824, independent of its route of administration; episodic release of LH was suppressed. (via Semantic Scholar)
Source: NC State University Libraries
Added: August 6, 2018

1990 article

Active immunization of pigs against growth hormone-releasing factor: effect on concentrations of growth hormone and insulin-like growth factor 1.

Armstrong, J. D., Esbenshade, K. L., Johnson, J. L., Coffey, M. T., Heimer, E., Campbell, R. M., … Felix, A. (1990, January 1). Journal of Animal Science.

By: J. Armstrong n, K. Esbenshade n, J. Johnson n, M. Coffey n, E. Heimer n, R. Campbell  n, T. Mowles n, A. Felix  n

MeSH headings : Animals; Antibody Formation; Female; Growth Hormone / blood; Growth Hormone-Releasing Hormone / immunology; Immunity, Active; Immunization / veterinary; Immunization, Secondary; Insulin-Like Growth Factor I / analysis; Random Allocation; Somatomedins / analysis; Swine / immunology; Swine / metabolism
topics (OpenAlex): Growth Hormone and Insulin-like Growth Factors; Reproductive Physiology in Livestock; Animal health and immunology
TL;DR: Cyclic gilts were used to determine the effect of active immunization against growth hormone-releasing factor GRF(1-29)-NH2 on concentrations of growth hormone (GH) and insulin-like growth factor 1 (IGF-1) and the concentrations were lower in GRF-HSA than in HSA gilts (P less than .05). (via Semantic Scholar)
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3. Good Health and Well-being (OpenAlex)
Source: NC State University Libraries
Added: August 6, 2018

1990 article

Opioid control of growth hormone in the suckled sow is primarily mediated through growth hormone releasing factor

Armstrong, J. D., Esbenshade, K. L., Coffey, M. T., Heimer, E., Campbell, R., Mowles, T., & Felix, A. (1990, April 1). Domestic Animal Endocrinology.

By: J. Armstrong n, K. Esbenshade n, M. Coffey n, E. Heimer*, R. Campbell *, T. Mowles*, A. Felix *

MeSH headings : Animals; Endorphins / physiology; Female; Growth Hormone / metabolism; Growth Hormone-Releasing Hormone / immunology; Growth Hormone-Releasing Hormone / physiology; Hypothalamus / drug effects; Hypothalamus / metabolism; Lactation / metabolism; Naloxone / pharmacology; Pituitary Gland / drug effects; Pituitary Gland / metabolism; Swine / metabolism
topics (OpenAlex): Growth Hormone and Insulin-like Growth Factors; Neuropeptides and Animal Physiology; Regulation of Appetite and Obesity
TL;DR: In conclusion, immunization against GRF-HSA blocked most of the effect of lactation on GH and PRL in all sows, and naloxone had no effect on LH. (via Semantic Scholar)
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Source: Web Of Science
Added: August 6, 2018

1988 article

Morphine Suppresses Luteinizing Hormone Concentrations in Transiently Weaned Sows and Delays Onset of Estrus after Weaning

Armstrong, J. D., Kraeling, R. R., & Britt, J. H. (1988, January 1). Journal of Animal Science.

By: J. Armstrong n, R. Kraeling n & J. Britt  n

MeSH headings : Animals; Estrus / drug effects; Female; Lactation / drug effects; Lactation / physiology; Luteinizing Hormone / metabolism; Morphine / pharmacology; Postpartum Period / drug effects; Postpartum Period / physiology; Pregnancy; Prolactin / metabolism; Swine / physiology; Weaning
topics (OpenAlex): Animal Behavior and Welfare Studies; Animal Nutrition and Physiology; Stress Responses and Cortisol
TL;DR: In the first experiment, crossbred multiparous sows nursing 7.9 +/- .4 pigs per litter at 25.2 +/- .3 d of lactation were subjected to one of three treatments during the middle 8-h segment of a 24-h experimental period to evaluate effects of morphine and suckling on secretion of LH and prolactin and occurrence of estrus after weaning. (via Semantic Scholar)
Source: NC State University Libraries
Added: August 6, 2018

1987 journal article

Season, suckling and nutrition alter ovarian function in swine through control of gonadotropin-releasing hormone

Dissertation Abstracts International. B, Sciences and Engineering, 47(8), 3178.

By: J. Armstrong

Source: NC State University Libraries
Added: August 6, 2018

1986 article

Seasonal differences in function of the hypothalamic—hypophysial—ovarian axis in weaned primiparous sows

Armstrong, J. D., Britt, J. H., & Cox, N. M. (1986, September 1). Reproduction.

By: J. Armstrong n, J. Britt  n & N. Cox n

MeSH headings : Animals; Estradiol / metabolism; Estrus; Feedback; Female; Follicle Stimulating Hormone / metabolism; Hypothalamo-Hypophyseal System / physiology; Hypothalamus / metabolism; Lactation; Luteinizing Hormone / metabolism; Ovarian Follicle / physiology; Ovary / physiology; Pituitary Gland / metabolism; Pituitary Hormone-Releasing Hormones / metabolism; Pregnancy; Reproduction; Seasons; Swine / physiology
topics (OpenAlex): Animal Behavior and Welfare Studies; Animal Nutrition and Physiology; Primate Behavior and Ecology
TL;DR: The results indicate that the period of post-weaning anoestrus in summer is prolonged because of altered activity of the hypothalamic-pituitary axis, possibly because of changes in sensitivity to the feedback of oestradiol. (via Semantic Scholar)
Source: NC State University Libraries
Added: August 6, 2018

1985 article

Pulsatile Administration of Gonadotropin-Releasing Hormone to Anestrous Sows: Endocrine Changes Associated with GnRH-Induced and Spontaneous Estrus1

Armstrong, J. D., & Britt, J. H. (1985, September 1). Biology of Reproduction.

By: J. Armstrong n & J. Britt  n

MeSH headings : Animals; Estradiol / blood; Estrus / drug effects; Female; Luteinizing Hormone / blood; Ovulation / drug effects; Pituitary Hormone-Releasing Hormones / administration & dosage; Pituitary Hormone-Releasing Hormones / pharmacology; Swine
topics (OpenAlex): Animal Behavior and Welfare Studies; Animal Nutrition and Physiology; Reproductive Physiology in Livestock
TL;DR: Pollen administration of gonadotropin-releasing hormone would induce estrus and ovulation in seasonally anestrous primiparous sows and endocrine responses of GnRH-induced sows were compared with those of primiparate sows that exhibited spontaneous estrus after weaning. (via Semantic Scholar)
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13. Climate Action (Web of Science)
Source: Web Of Science
Added: August 6, 2018

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