S. Walker

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Periconceptional Undernutrition Programs Changes in Insulin-Signaling Molecules and MicroRNAs in Skeletal Muscle in Singleton and Twin Fetal Sheep1

D. Humphreys, S. Ozanne, C. Roberts, 2014, Biology of reproduction.

Somatic cell nuclear transfer in the sheep induces placental defects that likely precede fetal demise.

C. Roberts, I. McMillen, S. Walker, 2007, Reproduction.

Periconceptional undernutrition in normal and overweight ewes leads to increased adrenal growth and epigenetic changes in adrenal IGF2/H19 gene in offspring

Song Zhang, J. Morrison, C. Suter, 2010, FASEB journal : official publication of the Federation of American Societies for Experimental Biology.

In vitro culture of sheep embryos without co-culture: Successes and perspectives

S. Walker, R. Seamark, T. M. Heard, 1992 .

Embryo viability, duration of gestation and birth weight in sheep after transfer of in vitro matured and in vitro fertilized zygotes cultured in vitro or in vivo.

S. Walker, P. Holm, R. Seamark, 1996, Journal of reproduction and fertility.

The production of unusually large offspring following embryo manipulation: Concepts and challenges

S. Walker, K. Hartwich, R. Seamark, 1996 .

No differences in sheep somatic cell nuclear transfer outcomes using serum-starved or actively growing donor granulosa cells.

T. Peura, S. Walker, K. Hartwich, 2003, Reproduction, fertility, and development.

Effect of variable long-term maternal feed allowance on the development of the ovine placenta and fetus.

D. Kleemann, S. Walker, J. Owens, 2008, Placenta.

Impact of maternal periconceptional overnutrition on fat mass and expression of adipogenic and lipogenic genes in visceral and subcutaneous fat depots in the postnatal lamb.

I. McMillen, S. Maclaughlin, D. Kleemann, 2010, Endocrinology.

Periconceptional overnutrition and offspring gender influence the development of adiposity and adipogenic gene expression in the lamb

I. McMillen, S. Maclaughlin, D. Kleemann, 2008, Proceedings of the Nutrition Society.

The effects of an ovine oviductal estrus-associated glycoprotein on early embryo development

J. L. Hill, S. Walker, C. Nancarrow, 1996 .

Impact of in vitro embryo culture and transfer on blood pressure regulation in the adolescent lamb

J. Armitage, Song Zhang, I. McMillen, 2020, Journal of Developmental Origins of Health and Disease.

Neonatal lamb mortality: major risk factors and the potential ameliorative role of melatonin

D. Kleemann, S. Walker, K. Kind, 2020, Journal of Animal Science and Biotechnology.

Embryo number and periconceptional undernutrition in the sheep have differential effects on adrenal epigenotype, growth, and development.

C. Roberts, Song Zhang, I. McMillen, 2014, American journal of physiology. Endocrinology and metabolism.

Maternal dietary restriction during the periconceptional period in normal-weight or obese ewes results in adrenocortical hypertrophy, an up-regulation of the JAK/STAT and down-regulation of the IGF1R signaling pathways in the adrenal of the postnatal lamb.

Song Zhang, I. McMillen, J. Morrison, 2013, Endocrinology.

Periconceptional nutrition and the relationship between maternal body weight changes in the periconceptional period and feto‐placental growth in the sheep

C. Roberts, S. Maclaughlin, D. Kleemann, 2005, The Journal of physiology.

Effect of nutrition during pregnancy on fetal growth and survival in Fec(B) Booroola x South Australian Merino ewes.

D. Kleemann, S. Walker, R. Seamark, 1993, Theriogenology.

Effect of nutrition during pregnancy on birth weight and lamb survival in FecB Booroola×South Australian Merino ewes

D. Kleemann, S. Walker, R. Seamark, 1993 .

Impact of periconceptional undernutrition on adrenal growth and adrenal insulin-like growth factor and steroidogenic enzyme expression in the sheep fetus during early pregnancy.

D. Tosh, I. McMillen, S. Maclaughlin, 2007, Endocrinology.

Periconceptional undernutrition and being a twin each alter kidney development in the sheep fetus during early gestation.

D. Tosh, I. McMillen, S. Maclaughlin, 2010, American journal of physiology. Regulatory, integrative and comparative physiology.

Impact of periconceptional and preimplantation undernutrition on factors regulating myogenesis and protein synthesis in muscle of singleton and twin fetal sheep

D. Humphreys, S. Ozanne, C. Roberts, 2015, Physiological reports.

Maternal obesity or weight loss around conception impacts hepatic fatty acid metabolism in the offspring

Song Zhang, I. McMillen, J. Morrison, 2014, Obesity.

Maternal undernutrition during the first week after conception results in decreased expression of glucocorticoid receptor mRNA in the absence of GR exon 17 hypermethylation in the fetal pituitary in late gestation

C. Roberts, Song Zhang, I. McMillen, 2013, Journal of Developmental Origins of Health and Disease.

Effect of Nutrition of Oocyte Donor on the Outcomes of Somatic Cell Nuclear Transfer in the Sheep1

T. Peura, D. Kleemann, S. Walker, 2003, Biology of reproduction.

Effects of insulin-like growth factor-I, epidermal growth factor and cysteamine on the in vitro maturation and development of oocytes collected from 6- to 8-week-old Merino lambs.

D. Kleemann, S. Walker, W. Maxwell, 2008, Reproduction, fertility, and development.

A growth factor phenotype map for ovine preimplantation development.

G. Schultz, S. Walker, M. Arcellana‐Panlilio, 1994, Biology of reproduction.

Myogenesis in sheep is altered by maternal feed intake during the peri-conception period.

D. Kleemann, S. Walker, J. Owens, 2005, Animal reproduction science.

Effects of grade of oocyte-cumulus complex and the interactions between grades on the production of blastocysts in the cow, ewe and lamb.

D. Kleemann, S. Walker, S. Rudiger, 2007, Reproduction in domestic animals = Zuchthygiene.

Sexual behaviour, semen quality and fertility of young Border Leicester rams administered melatonin during spring.

D. Kleemann, S. Walker, A. Tilbrook, 2021, Animal reproduction science.

Positive effects of melatonin treatment on the reproductive performance of young border leicester rams mated to merino ewes in spring: preliminary observations.

D. Kleemann, S. Walker, A. Tilbrook, 2014, Reproduction in domestic animals = Zuchthygiene.

Review of the impact of heat stress on reproductive performance of sheep

P. Hayman, D. Kleemann, S. Walker, 2021, Journal of Animal Science and Biotechnology.

Maternal Supplementation with Dietary Betaine during Gestation to Improve Twin Lamb Survival

D. Kleemann, S. Walker, Bobbie E. Lewis Baida, 2020, Animals : an open access journal from MDPI.

Plasma glucose levels in South Australian Merino ewes.

D. Kleemann, S. Walker, J. Walkley, 1988, Australian veterinary journal.

Evaluation of Gestational Deficiencies in Cloned Sheep Fetuses and Placentae1

I. Wilmut, S. Walker, L. Young, 2001, Biology of reproduction.

Long-term effects on offspring of exposure of oocytes and embryos to chemical and physical agents.

S. Walker, J. Robinson, K. Hartwich, 2000, Human reproduction update.

Development of ovine embryos in synthetic oviductal fluid containing amino acids at oviductal fluid concentrations.

J. L. Hill, D. Kleemann, S. Walker, 1996, Biology of reproduction.

Expression of bacterial cysteine biosynthesis genes in transgenic mice and sheep: toward a newin vivo amino acid biosynthesis pathway and improved wool growth

S. Walker, P. Verma, G. Rogers, 1995, Transgenic Research.

Preimplantation development of in vitro-matured and in vitro-fertilized ovine zygotes: comparison between coculture on oviduct epithelial cell monolayers and culture under low oxygen atmosphere.

S. Walker, D. Armstrong, R. Seamark, 1994, Biology of reproduction.

Culture of sheep zygotes in synthetic oviduct fluid medium with different concentrations of sodium bicarbonate and HEPES.

S. Walker, R. Seamark, R. Lampe, 1989, Theriogenology.

Ovine ooplasm directs initial nucleolar assembly in embryos cloned from ovine, bovine, and porcine cells

T. Peura, S. Walker, J. Laurinčík, 2004, Molecular reproduction and development.

Effect of paternal heat stress on the development in vitro of preimplantation embryos in the mouse

B. Zhu, S. Walker, H. Oakey, 2004, Andrologia.

Sheep transgenesis with keratin and non-keratin genes: expression in the wool follicle for modified fibre properties and growth rates.

S. Walker, G. Rogers, B. Powell, 1999, Experimental dermatology.

Impact of embryo number and maternal undernutrition around the time of conception on insulin signaling and gluconeogenic factors and microRNAs in the liver of fetal sheep.

D. Humphreys, S. Ozanne, C. Roberts, 2014, American journal of physiology. Endocrinology and metabolism.

An ovine transgenic Huntington's disease model.

M. MacDonald, J. C. Jacobsen, R. Snell, 2010, Human molecular genetics.

Fertility in South Australian commercial Merino flocks: relationships between reproductive traits and environmental cues.

D. Kleemann, S. Walker, 2005, Theriogenology.

Effect of periconceptional nutrition on the growth, behaviour and survival of the neonatal lamb.

S. Hiendleder, I. McMillen, J. Morrison, 2015, Animal reproduction science.

A study of real-time ultrasonography for predicting ovine foetal growth under field conditions.

D. Kleemann, S. Walker, R. Seamark, 1987, Australian veterinary journal.

Morphological characterization of pre- and peri-implantation in vitro cultured, somatic cell nuclear transfer and in vivo derived ovine embryos.

T. Peura, S. Walker, P. Maddox-Hyttel, 2005, Reproduction.

Effect of early progesterone administration on fetal growth and survival in sheep

D. Kleemann, S. Walker, R. Seamark, 1994 .

culture of sheep zygotes following pronuclear microinjection

S. Walker, P. Verma, G. Rogers, 1990 .

The use of synthetic gonadotropin releasing hormone treatment in the collection of sheep embryos.

S. Walker, R. Seamark, R. Ashman, 1989, Theriogenology.

Time of ovulation in the South Australian Merino ewe following synchronization of estrus. 2. Efficacy of GnRH treatment and its relevance to insemination programs utilizing frozen-thawed semen.

S. Walker, R. Seamark, D. H. Smith, 1989, Theriogenology.

Variation in the timing of multiple ovulations following gonadotropin releasing hormone treatment and its relevance to collecting pronuclear embryos of sheep.

S. Walker, R. Seamark, D. H. Smith, 1987, Theriogenology.

Exogenous progesterone and embryo survival in Booroola-cross ewes.

D. Kleemann, S. Walker, R. Seamark, 1991, Reproduction, fertility, and development.

Expression of a Wool Intermediate Filament Keratin Transgene in Sheep Fibre Alters Structure

S. Walker, G. Rogers, B. Powell, 1998, Transgenic Research.

The effect of the F gene on male reproductive traits in Booroola × South Australian Merino rams

S. Walker, R. Ponzoni, J. Walkley, 1985 .

The effects of an estrus-associated oviductal glycoprotein on the in vitro fertilization and development of ovine oocytes matured in vitro

J. L. Hill, S. Walker, C. Nancarrow, 1996 .

Effect of GnRH treatment on the maturation and in vitro development of oocytes collected from 4- to 6-week-old Merino lambs.

D. Kleemann, S. Walker, W. Maxwell, 2007, Reproduction, fertility, and development.

Enhanced efficiency in the production of offspring from 4- to 8-week-old lambs.

D. Kleemann, S. Walker, J. Kelly, 2005, Theriogenology.

Fertility in South Australian commercial Merino flocks: sources of reproductive wastage.

D. Kleemann, S. Walker, 2005, Theriogenology.

Production in mature corriedale ewes first mated at 7 to 11 or 18 months of age

S. Walker, R. Ponzoni, M. Azzarini, 1979 .

The development of male reproductive traits in progeny of Merino strains of different reproductive performance

S. Walker, R. Ponzoni, J. Walkley, 1985 .

Effect of pre-mating nutrition on reproductive performance of Booroola Merino × South Australian Merino ewes

D. Kleemann, S. Walker, R. Seamark, 1991 .

Fertilization and embryo loss in Booroola Merino x South Australian Merino ewes: Effect of the F gene.

D. Kleemann, S. Walker, R. Seamark, 1990, Theriogenology.

Enhanced fetal growth in sheep administered progesterone during the first three days of pregnancy.

D. Kleemann, S. Walker, R. Seamark, 1994, Journal of reproduction and fertility.

Plasma anti-Müllerian hormone concentration as a predictive endocrine marker for selection of donor lambs to improve success in juvenile invitro embryo transfer programs.

D. Kleemann, S. Walker, K. Kind, 2019, Reproduction, fertility, and development.

Sex of co-twin affects the in vitro developmental competence of oocytes derived from 6- to 8-week-old lambs.

D. Kleemann, S. Walker, K. Kind, 2017, Reproduction, fertility, and development.

The effect of peri-conception nutrition on embryo quality in the superovulated ewe.

D. Kleemann, S. Walker, S. Rudiger, 2005, Theriogenology.

Ovarian follicle dynamics in ewes treated with intra-vaginal progesterone pessaries. 1. Follicle waves and parameters of the estrous cycle.

D. Kleemann, S. Walker, A. Swinbourne, 2022, Theriogenology.

Timing of multiple ovulations in the ewe after treatment with FSH or PMSG with and without GnRH.

S. Walker, R. Seamark, D. H. Smith, 1986, Journal of reproduction and fertility.

Differential effects of maternal obesity and weight loss in the periconceptional period on the epigenetic regulation of hepatic insulin‐signaling pathways in the offspring

S. Ozanne, Song Zhang, I. McMillen, 2013, FASEB journal : official publication of the Federation of American Societies for Experimental Biology.

Optimisation of in vitro culture conditions in B6CBF1 mouse embryos.

B. Zhu, S. Walker, S. Maddocks, 2004, Reproduction, nutrition, development.

Impact of embryo number and periconceptional undernutrition on factors regulating adipogenesis, lipogenesis, and metabolism in adipose tissue in the sheep fetus.

S. Ozanne, C. Roberts, Song Zhang, 2013, American journal of physiology. Endocrinology and metabolism.

102 VITRIFICATION OF IN VITRO-PRODUCED BOVINE AND OVINE EMBRYOS USING THE MINIMUM VOLUME COOLING CRYOTOP METHOD

D. Kleemann, S. Walker, M. Kuwayama, 2004 .

99 EFFECT OF CYSTEAMINE ON SURVIVAL OF BOVINE AND OVINE OOCYTES VITRIFIED USING THE MINIMUM VOLUME COOLING (MVC) CRYOTOP METHOD

D. Kleemann, S. Walker, M. Kuwayama, 2006 .

culture of ovine IVM-IVF ova: Effect on lambing

S. Walker, P. Holm, R. Seamark, 1994 .

A definition of the breeding season of Pool Dorset ewes.

S. Walker, E. Dunstan, D. Phillips, 1984, Theriogenology.

Effect of selenium supplementation on survival, liveweight and wool weight of young sheep on Kangaroo Island, South Australia

S. Walker, G. Hall, R. Ponzoni, 1979 .

Supplementing Merino ewes with melatonin during the last half of pregnancy improves tolerance of prolonged parturition and survival of second-born twin lambs.

D. Kleemann, S. Walker, K. Kind, 2020, Journal of animal science.

Fertility in South Australian commercial Merino flocks: aspects of management.

D. Kleemann, S. Walker, T. Grosser, 2006, Theriogenology.

Time of ovulation in the South Australian Merino ewe following synchronization of estrus. 1. Variation within and between flocks.

S. Walker, R. Seamark, D. H. Smith, 1989, Theriogenology.

Short communication: maternal melatonin implants improve twin Merino lamb survival.

D. Kleemann, S. Walker, K. Kind, 2020, Journal of animal science.

Effect of previous reproductive performance on current reproductive rate in South Australian Merino ewes

D. Kleemann, S. Walker, S. Walkom, 2016 .

Factors influencing lamb survival in a high fecundity Booroola Merino x South Australian Merino flock.

D. Kleemann, S. Walker, R. Seamark, 1990, Theriogenology.

Collection, culture and pronuclear microinjection of sheep zygotes / by Simon Kerry Walker

S. Walker, 1989 .

Melatonin dose: testicular and testosterone response in Border Leicester rams during spring

D. Kleemann, S. Walker, A. Tilbrook, 2022, Livestock Science.

Neonatal lamb mortality: major risk factors and the potential ameliorative role of melatonin

D. Kleemann, S. Walker, K. Kind, 2020, Journal of animal science and biotechnology.

Haemoglobin type and reproductive performance of sheep grazing oestrogenic pastures

S. Walker, G. Hall, R. Ponzoni, 1979 .

Reproductive wastage in South Australian commercial Merino flocks.

D. Kleemann, S. Walker, D. H. Smith, 1990 .

Improving the rate of production of sheep embryos using in vitro maturation and fertilization

J. L. Hill, S. Walker, C. A. Bee, 1994 .

Maternal undernutrition around the time of conception and embryo number each impact on the abundance of key regulators of cardiac growth and metabolism in the fetal sheep heart

C. Roberts, J. Morrison, S. Lie, 2013, Journal of Developmental Origins of Health and Disease.

Culture and manipulation of early goat embryos

K. Mclaughlin, S. Walker, R. Seamark, 1989 .

Uterine presensitization and embryo survival and growth in Booroola Merino x South Australian Merino ewes.

D. Kleemann, S. Walker, R. Seamark, 1989, Theriogenology.

Real-time ultrasound imaging for predicting ovine fetal age.

D. Kleemann, S. Walker, R. Seamark, 1990, Theriogenology.

Impact of maternal undernutrition around the time of conception on factors regulating hepatic lipid metabolism and microRNAs in singleton and twin fetuses.

D. Humphreys, S. Ozanne, C. Roberts, 2016, American journal of physiology. Endocrinology and metabolism.

Transgenic sheep and wool growth: possibilities and current status.

S. Walker, C. Bawden, G. Rogers, 1994, Reproduction, fertility, and development.

Fetoplacental growth in sheep administered progesterone during the first three days of pregnancy.

D. Kleemann, S. Walker, J. Owens, 2001, Placenta.

Sex-specific effects of in vitro culture and embryo transfer on cardiac growth in sheep offspring

J. Nyengaard, K. Botting, Song Zhang, 2023, Journal of Molecular and Cellular Cardiology Plus.

Evaluation of gestational deficiencies in cloned sheep.

I. Wilmut, S. Walker, L. Young, 2000 .

TRANSGENIC WOOL : OBJECTIVES AND APPROACHES FOR ALTERING WOOL PROPERTIES

T. Peura, S. Walker, G. Rogers, 2007 .

Differential Effects of Exposure to Maternal Obesity or Maternal Weight Loss during the Periconceptional Period in the Sheep on Insulin Signalling Molecules in Skeletal Muscle of the Offspring at 4 Months of Age

S. Ozanne, Song Zhang, I. McMillen, 2013, PloS one.

Differential effects of maternal obesity and weight loss in the periconceptional period on the epigenetic regulation of hepatic insulin‐signaling pathways in the offspring

S. Ozanne, Song Zhang, I. McMillen, 2013, FASEB journal : official publication of the Federation of American Societies for Experimental Biology.