Zobrazeno 1 - 10
of 47
pro vyhledávání: '"R.L. Fogwell"'
Publikováno v:
Biology of Reproduction. 44:693-700
The objective of this study was to examine changes in intrafollicular concentrations of inhibins and steroids in heifers during growth of dominant follicles. To obtain dominant ovulatory follicles, heifers received injections of prostaglandin (PG) on
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::ef70228fc654026d1eb0ed10be27a15a
https://doi.org/10.1095/biolreprod44.4.693
https://doi.org/10.1095/biolreprod44.4.693
Publikováno v:
Journal of Dairy Science. 73:2759-2765
The objective was to determine effects of energy balance and body condition on estrous behavior and estrous cycles in Holstein heifers. Before the experiment heifers were fed so body condition remained moderate or they became fat. During the 2 x 2 fa
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::96c3332b305c886e033998a44b6fb873
https://doi.org/10.3168/jds.s0022-0302(90)78961-8
https://doi.org/10.3168/jds.s0022-0302(90)78961-8
Publikováno v:
Domestic Animal Endocrinology. 7:135-148
A factorial experiment was conducted to determine influence of energy balance (EB) and body condition (BC) on luteal function in heifers. Heifers with moderate (MBC) or fat (FBC) BC were fed individually to sustain positive EB (PEB) or to cause negat
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::61e7c53ad29f418ff06c6665f24df0b5
https://doi.org/10.1016/0739-7240(90)90020-z
https://doi.org/10.1016/0739-7240(90)90020-z
Publikováno v:
Journal of dairy science. 78(4)
The effects of energy balance on the corpus luteum may be mediated by IGF-I. Our objective was to determine whether negative energy balance decreases expression of IGF-I mRNA in the liver or corpus luteum of heifers. For four consecutive estrous cycl
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::dccf4f16f4a9d1ca35f49b7f39d2e75d
https://pubmed.ncbi.nlm.nih.gov/7540633
https://pubmed.ncbi.nlm.nih.gov/7540633
Publikováno v:
Journal of animal science. 68(11)
Two experiments were conducted to develop a vaginal epithelium bioassay for zearalenone (Z) and to determine whether immunization against Z would prevent Z mycotoxicosis. Eleven gilts were ovariectomized and allotted by weight to dietary doses of 50,
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::6b0397586b9d249f9ead4c39711d31a9
https://pubmed.ncbi.nlm.nih.gov/2148171
https://pubmed.ncbi.nlm.nih.gov/2148171
Publikováno v:
Journal of Animal Science. 74:2239
Holstein heifers (approximately 1 yr old) were fed to be in negative energy balance (n = 14; NEB) or positive energy balance (n = 15; PEB) during four estrous cycles. Each heifer was given PGF2 alpha to control the timing of fourth estrus. From 1 d a
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::29320697b4943ce68ab80a91df37612a
https://doi.org/10.2527/1996.7492239x
https://doi.org/10.2527/1996.7492239x
Publikováno v:
Journal of Animal Science. 55:1125-1131
The objectives were to determine if photoperiods of 8 h light:16 h dark (8L:16D) and 16L:8D affect time of day when preovulatory surges of luteinizing hormone (LH) and follicle stimulating hormone (FSH) occur and if photoperiods affect diestrus and e
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::05b56172f1140eb9d9147cf84779b98f
https://doi.org/10.2527/jas1982.5551125x
https://doi.org/10.2527/jas1982.5551125x
Publikováno v:
Biology of Reproduction. 36:523-529
Destruction of ovarian follicles during diestrus prolongs the lifespan of corpora lutea in cows, but the site(s) of action is unclear. Thus, ovarian follicles were destroyed in 10 heifers (X-1RRAD) on Day 9postestrus, while 10 additional heifers (SHA
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::e0e60a25fd965841ecc7041a92d8d4d7
https://doi.org/10.1095/biolreprod36.3.523
https://doi.org/10.1095/biolreprod36.3.523
Publikováno v:
Journal of Animal Science. 67:943-950
Twenty-two primiparous Yorkshire sows were used to determine whether a minimal threshold of body fat exists below which the return to estrus is delayed. A second objective was to examine the relationship between body fat and interval from weaning to
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::517de476093f298249edf7ad8ffa3bf5
https://doi.org/10.2527/jas1989.674943x
https://doi.org/10.2527/jas1989.674943x
Enhanced Precision of Estrus and Luteinizing Hormone After Progesterone and Prostaglandin in Heifers
Publikováno v:
Journal of Dairy Science. 69:2179-2185
Objectives were to determine if low progesterone and increased basal luteinizing hormone for 3 d after injecting prostaglandin F2 alpha would affect precision of preovulatory surges of luteinizing hormone and onset of estrus in Holstein heifers. In e
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::bf99fba46efc4719f255740874746ba4
https://doi.org/10.3168/jds.s0022-0302(86)80651-8
https://doi.org/10.3168/jds.s0022-0302(86)80651-8