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Regulatory roles of leptin in reproduction and metabolism: a comparative review.

• Dorota Anna Zieba, Marcel Amstalden, Gary L. Williams
• Domestic animal endocrinology
• 2005

Leptin plays an important role in signaling nutritional status to the central reproductive axis of mammals and appears to be at least a permissive factor in the initiation of puberty. The expression… (More)

Dietary fats varying in their fatty acid composition differentially influence follicular growth in cows fed isoenergetic diets.

• Milt G. Thomas, Bili Bao, Gary L. Williams
• Journal of animal science
• 1997

The working hypothesis was that dietary fats differing in fatty acid composition would differentially influence ovarian follicular growth. Cows (n = 27) were fed isoenergetic, isonitrogenous, and… (More)

Leptin gene expression, circulating leptin, and luteinizing hormone pulsatility are acutely responsive to short-term fasting in prepubertal heifers: relationships to circulating insulin and…

• Marcel Amstalden, Michelle R. Garcia, +5 authors Gary L. Williams
• Biology of reproduction
• 2000

In the present study, we tested the hypothesis that short-term fasting would reduce leptin gene expression, circulating leptin, and LH pulsatility in prepubertal heifers in association with a… (More)

Diet-induced hyperlipidemia in cattle modifies the intrafollicular cholesterol environment, modulates ovarian follicular dynamics, and hastens the onset of postpartum luteal activity.

• M E Wehrman, Thomas H. Welsh, Gary L. Williams
• Biology of reproduction
• 1991

Three experiments were conducted with female cattle during the postpartum period and during the estrous cycle to examine the effects of diet-induced hyperlipidemia on lipoprotein-cholesterol and… (More)

Central infusion of recombinant ovine leptin normalizes plasma insulin and stimulates a novel hypersecretion of luteinizing hormone after short-term fasting in mature beef cows.

• Marcel Amstalden, Michelle R. Garcia, +4 authors Gary L. Williams
• Biology of reproduction
• 2002

The present studies tested the hypotheses that short-term fasting would reduce leptin gene expression and circulating concentrations of leptin and insulin in mature, ovariectomized,… (More)

Genetically engineered mice with an additional class of cone photoreceptors: implications for the evolution of color vision.

• Philip M. Smallwood, Bence P Olveczky, +4 authors Jeremy Nathans
• Proceedings of the National Academy of Sciences…
• 2003

Among eutherian mammals, only primates possess trichromatic color vision. In Old World primates, trichromacy was made possible by a visual pigment gene duplication. In most New World primates,… (More)

Modulation of luteal activity in postpartum beef cows through changes in dietary lipid.

• Gary L. Williams
• Journal of animal science
• 1989

Studies were conducted to evaluate the normal changes in lipid metabolism occurring in the suckled Brahman crossbred female during the postpartum period (Exp. 1) and to examine the function of… (More)

Suckling as a regulator of postpartum rebreeding in cattle: a review.

• Gary L. Williams
• Journal of animal science
• 1990

An extended and variable period of anovulation and anestrus occurs in suckled beef cows following parturition. This imposes both biological and economic constraints on the efficiency of beef… (More)

Effects of leptin on basal and GHRH-stimulated GH secretion from the bovine adenohypophysis are dependent upon nutritional status.

• Dorota Anna Zieba, Marcel Amstalden, +4 authors Gary L. Williams
• The Journal of endocrinology
• 2003

We have shown recently that leptin modulates at least two aspects of anterior pituitary LH release in ruminants: basal and GnRH-mediated release. To test the hypothesis that leptin directly affects… (More)

Ovarian follicular characteristics, embryo recovery, and embryo viability in heifers fed high-fat diets and treated with follicle-stimulating hormone.

• Dr. James P. Ryan, R A Spoon, Gary L. Williams
• Journal of animal science
• 1992

Postpubertal beef heifers (n = 55) were used to examine the effects of high-fat diets, independently of energy intake, on nonesterified fatty acid and lipoprotein metabolic patterns, ovarian… (More)

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