• Publications
  • Influence
Sex preselection in rabbits: live births from X and Y sperm separated by DNA and cell sorting.
Intact, viable X and Y chromosome-bearing sperm populations of the rabbit were separated according to DNA content with a flow cytometer/cell sorter. Reanalysis for DNA of an aliquot from each sortedExpand
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Sperm survival and transport in the female reproductive tract.
  • H. Hawk
  • Biology, Medicine
  • Journal of dairy science
  • 1 December 1983
Fertilization failure, mostly due to absence of sperm in the oviducts, is a major cause of reproductive inefficiency of farm animals. Sperm may be transported to the oviducts of cattle and sheepExpand
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Ovarian and pituitary hormones in blood of progestogen-treated ewes.
To study the effect of progesterone or synthetic progestogenic compounds on ovarian and pituitary hormonal secretion patterns during and after treatment parous Rambouillet ewes were given 1 of 5Expand
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Making transgenic livestock: Genetic engineering on a large scale
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 orExpand
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Transport and fate of spermatozoa after insemination of cattle.
  • H. Hawk
  • Biology, Medicine
  • Journal of dairy science
  • 1 July 1987
Sperm capable of fertilizing ova reach the isthmus of cows about 8 h after mating and remain in the caudal 2 cm of the isthmus until ovulation. Then small numbers of sperm move to the site ofExpand
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Embryonic Mortality Between 16 and 34 Days Post-Breeding in Cows of Low Fertility
Summary A study was made to determine the percentage of repeat-breeder cows with normal embryos at 16 elapsed days of gestation and the embryonic death rate between 16 and 34 elapsed days. ApparentlyExpand
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Investigation of means to improve rates of fertilization in in vitro matured/in vitro fertilized bovine oocytes.
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 andExpand
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Improved yields of bovine blastocysts from in vitro-produced oocytes. II. Media and co-culture cells
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 oocytesExpand
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