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Filtering by: Alternative title ssim Data report 170 Creator Floyd, Donald J. Degree Level Doctoral

Early development of the endocrine system in salmonids : regulation of sex differentiation and ontogeny of the stress response

Creator:

Floyd, Donald J.

Abstract:

Sex steroids, follicle stimulating hormone (FSH), luteinizing hormone (LH) and gonadotropin releasing hormone (GnRH) were measured in monosex and mixed sex populations of rainbow trout during early development. Steroids declined following fertilization, increased at hatch, then fell and remained constant thereafter. Trends toward differences in steroids between males and females...

Resource Type:

Dissertation

Full Text:

, Corvallis, Oregon 97331 1 Oregon Agricultural Experiment Station, Technical Report No. 10,250. 2
Ryegrass fluorescence expression during three generations of seed increase and its heritability among half-sib families

Creator:

Floyd, Donald J.

Abstract:

Seedling root fluorescence (SRF) has been used as a test in the USA since 1941 to discriminate Italian ryegrass (Lolium multiflorum Lam.) from perennial ryegrass (L. perenne L.). Generally, roots of Italian ryegrass fluorescece when exposed to ultraviolet light, while roots of perennial ryegrass do not. Presence of fluorescent seedlings...

Resource Type:

Dissertation

Full Text:

cultivar development than any other grass for turfuse (Frey, 1996). A report published in 1992 revealed