Zobrazeno 1 - 10
of 34
pro vyhledávání: '"R. D. Allrich"'
Effect of Progesterone on the Expression of Estrus at the First Postpartum Ovulation in Dairy Cattle
Publikováno v:
Journal of Dairy Science. 75:1456-1460
Fifty-two lactating Holstein cows were randomly assigned to receive either a progesterone-releasing (2 g of progesterone) or a control-releasing intravaginal device (0 g of progesterone). Intravaginal devices were inserted on d 10 and removed on d 15
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::4a91325194e7dcb68868bc74a8f85afc
https://doi.org/10.3168/jds.s0022-0302(92)77901-6
https://doi.org/10.3168/jds.s0022-0302(92)77901-6
Autor:
K G Hein, R. D. Allrich
Publikováno v:
Journal of Animal Science. 70:243-247
A two-trial experiment was conducted to determine the influence of ACTH on estrous behavior in cattle. In Trial 1, Holstein heifers (n = 20) received an injection of prostaglandin F2 alpha (PGF) during a synchronized diestrus and 30 h later were allo
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::f7b2681f3a08ab610b4c62127a9c19e9
https://doi.org/10.2527/1992.701243x
https://doi.org/10.2527/1992.701243x
Autor:
R. D. Allrich
Publikováno v:
Journal of dairy science. 77(9)
During proestrus, gonadotropins induce final follicular maturation, resulting in increased secretion of estradiol. Estradiol, in the relative absence of progesterone, acts on the hypothalamus to induce estrous behavior. The mean duration of estrus is
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::550ea643eb2a5e7a4277f61dfb40628d
https://pubmed.ncbi.nlm.nih.gov/7814742
https://pubmed.ncbi.nlm.nih.gov/7814742
Autor:
R. D. Allrich
Publikováno v:
The Veterinary clinics of North America. Food animal practice. 9(2)
Hormonal events determine the timing and maximum duration of estrous behavior, whereas environmental and social factors modulate or completely inhibit the expression of estrus. The efficiency of estrous detection can be improved on most livestock far
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::0f19480d9fa7ce65acbd7d2ad73e148f
https://pubmed.ncbi.nlm.nih.gov/8348370
https://pubmed.ncbi.nlm.nih.gov/8348370
Autor:
K G, Hein, R D, Allrich
Publikováno v:
Journal of animal science. 70(1)
A two-trial experiment was conducted to determine the influence of ACTH on estrous behavior in cattle. In Trial 1, Holstein heifers (n = 20) received an injection of prostaglandin F2 alpha (PGF) during a synchronized diestrus and 30 h later were allo
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=pmid________::d4eda5e2427b34f3a15374adde9a77da
https://pubmed.ncbi.nlm.nih.gov/1316341
https://pubmed.ncbi.nlm.nih.gov/1316341
Publikováno v:
Meat science. 31(4)
Forty-eight Yorkshire × Chester White crossbred boars, 28 days of age, were assigned to one of four diets differing in crude protein content. Dietary crude protein content was 23% initially and then adjusted to 14, 17, 20 or 23% at 9 weeks of animal
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::242c6462b11b3d9e2b069686050c54e8
https://pubmed.ncbi.nlm.nih.gov/22059688
https://pubmed.ncbi.nlm.nih.gov/22059688
Publikováno v:
Biology of Reproduction. 34:145-158
Changes in the ultrastructure of Leydig cells during pubertal development in the boar (40 to 250 days of age) were assessed using quantitative morphometric procedures, and the results were compared to the in vitro steroidproducing capacity and gonado
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::7cfc97475bcd331c1d2502e91634f118
https://doi.org/10.1095/biolreprod34.1.145
https://doi.org/10.1095/biolreprod34.1.145
Publikováno v:
Journal of Animal Science. 62:717-722
Endocrine changes in the hypophyseal-ovarian axis associated with early calf removal were investigated in anestrous beef cows. Tissues were collected and analyzed from multiparous beef cows slaughtered at O (n = 8), 36 (n = 8) or 72 h (n = 8) after c
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::f8823d8684d4198578ec47992cdd7278
https://doi.org/10.2527/jas1986.623717x
https://doi.org/10.2527/jas1986.623717x
Publikováno v:
Journal of Animal Science. 53:1458-1464
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::7a326b00f81221cd14b8d56a5f4d590c
https://doi.org/10.2527/jas1982.5361458x
https://doi.org/10.2527/jas1982.5361458x
Publikováno v:
Biology of Reproduction. 31:541-547
Luteinizing hormone-human chorionic gonadotropin (LH-hCG) binding capacity for testes of boars and receptor sites per Leydig cell were estimated during pubertal development from 70 to 250 days of age, and changes in these two traits were correlated w
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::4ffc7c128c94265d159e979962b74247
https://doi.org/10.1095/biolreprod31.3.541
https://doi.org/10.1095/biolreprod31.3.541