Zobrazeno 1 - 10
of 102
pro vyhledávání: '"H. W. Hawk"'
Publikováno v:
Journal of Animal Science. 72:719-724
In a 2 x 2 factorial experiment, 110 Holstein cows (55 first-breeding and 55 repeat-breeding), free of genital abnormalities, were injected i.m. at the time of insemination with either saline solution or 100 micrograms of GnRH. Blood samples were dra
Improved yields of bovine blastocysts from in vitro-produced oocytes. II. Media and co-culture cells
Autor:
Robert J. Wall, H. W. Hawk
Publikováno v:
Theriogenology. 41:1585-1594
Three experiments were conducted with 9,472 oocytes, aspirated from ovaries of slaughtered cows (7,318 cleaved zygotes), to compare some media and co-culture cells for in vitro maturation of oocytes and culture of embryos. The endpoint was developmen
Autor:
H. W. Hawk, Robert J. Wall
Publikováno v:
Theriogenology. 41:1571-1583
Three experiments were conducted with 7,901 oocytes (6,152 cleaved zygotes) to identify methods to increase the proportion of oocytes aspirated from ovaries of slaughtered cows that would develop to expanded blastocysts by 9 d after exposure to sperm
Publikováno v:
Animal Biotechnology. 2:45-59
Experiments were conducted to determine the efficiency of visualizing pronuclei in living zygotes. Oocytes aspirated from ovaries of slaughtered cows were matured for 24 hr, fertilized, and examined by differential interference contrast microscopy (D
Effect of gonadotropin-releasing hormone on estrus, ovulation, and ovum cleavage rates of dairy cows
Publikováno v:
Journal of animal science. 72(3)
In a 2 x 2 factorial experiment, 110 Holstein cows (55 first-breeding and 55 repeat-breeding), free of genital abnormalities, were injected i.m. at the time of insemination with either saline solution or 100 micrograms of GnRH. Blood samples were dra
Publikováno v:
Journal of cellular biochemistry. 49(2)
The feasibility of introducing foreign genes into the genomes of cattle, goats, pigs, and sheep has only recently been demonstrated. Studies have thus far focused on improving growth efficiency or directing expression of pharmaceutical proteins to th
Publikováno v:
Theriogenology. 38(6)
Experiments were conducted with 5,979 oocytes to determine whether detaching some of the cumulus cells from oocytes either before or after maturation would improve the fertilization rate and proportion of oocytes that developed to expanded blastocyst
Autor:
Kevin D. Wells, Max Paape, Anne M. Powell, Vernon G. Pursel, Neil C. Talbot, H. W. Hawk, Robert J. Wall, Douglas D. Bannerman, David Kerr
Publikováno v:
Nature Biotechnology. 23:897-897
Nat. Biotechnol. 23, 445–451 (2005) In the abstract on page 445, the quantities given for lysostaphin in the following sentences are incorrect: “To test the feasibility of protecting animals through genetic engineering, transgenic cows secreting