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Filtering by: Contributor advisor sim Meyer, Howard H. Remove constraint Contributor advisor sim: Meyer, Howard H. Degree Level Master's Remove constraint Degree Level: Master's

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Effect of early exposure of tansy ragwort (Senecio jacobaea) on future grazing preferences of sheep

Creator:

Naranjo R., Victor Hugo

Abstract:

Tansy ragwort (Senecio iacobea) is a widely distributed weed in the Pacific Northwest (U.S.A.) where it causes severe damage to the livestock industry. Sheep are highly resistant to toxic effects of ragwort, therefore, induction of ragwort preference in sheep was sought as a means to control this poisonous plant. The...

Resource Type:

Masters Thesis
Genetic and environmental influences on lamb carcass indices and muscle fiber ratios

Creator:

Arnold, Andrew M.

Abstract:

Two concurrent trials were conducted to examine genetic and environmental influences on growth rate, carcass fatness and muscle fiber type proportions. Trial 1 compared Polypay and Coopworth x Polypay male lambs either left intact or castrated early, mid or late in growth. Trial two compared Hampshire sired lambs (females, early...

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Masters Thesis
Effects of differential ewe body condition at mating and early post-mating nutrition on embryo survival

Creator:

West, Kathryn S.

Abstract:

Two trials were conducted over consecutive years to examine the effects of ewe body condition and post-mating nutrition on ovulation rates and embryo survival. Trial 1 used 146 Polypay ewes ranging in age from 5 to 8 years in a 3 x 2 factorial array of pre-mating (high-H, low flushed-LF...

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Masters Thesis
Effects of body condition and pre-lambing supplementation on ewe productivity

Creator:

Khan, Khalidullah

Abstract:

A series of trials was conducted with Polypay (P), Coopworth (CP), Hampshire (H), and crossbred ewes over a two year period at three locations to assess the effects of ewe body condition and pre-lambing supplementation on ewe productivity. Supplementation trials were conducted at all three locations in Year 1 using...

Resource Type:

Masters Thesis
Effect of callipyge gene on lamb growth, carcass characteristics, and meat quality

Creator:

Srinivasan, Haribaskar

Abstract:

Callipyge (CLPG, n=16) and normal (N, n=11) lambs were produced from Polypay dams and Dorset sires heterozygous for the CLPG gene to study the effects of the gene on growth and carcass and meat quality parameters. CLPG lambs had higher average daily gain than N lambs (0.26 vs 0.23 kg/day,...

Resource Type:

Masters Thesis
Effects of sheep grazing to control weeds in a pine plantation on weed reproductive success, trees and sheep performance

Creator:

Milliman, Lisa J.

Abstract:

Use of sheep to control weeds in a ryegrass-white clover pasture in which Knob Cone-Monterrey hybrid pine trees had been planted was investigated in Corvallis, Oregon during 1997-1998. Treatments consisted of an ungrazed control (C) and grazing applications to achieve 25 (L), 50 (M) or 75 (H) percent utilization of...

Resource Type:

Masters Thesis
Effects of genotype, nutrition, and progesterone on uterine efficiency in the ewe

Creator:

Fackrell, Bronwyn B.

Abstract:

Embryonic loss of potential lambs resulting in partial failure of multiple ovulations is a significant factor in the reproductive rate of prolific breeds. The roles of genetic and nutritional variation (and their possible interaction) on embryonic loss were studied by mating blackface and whiteface ewes of either high or low...

Resource Type:

Masters Thesis

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Academic Affiliation

Animal Sciences6

Advisor

Meyer, Howard H.7

Commencement Year

Commencement Year range begin – Commencement Year range end

Current results range from 1987 to 2005

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Committee Member

Holmes, ZoeAnn1
Pearson, Albert1
Thomas, David R.1

Creator

Arnold, Andrew M.1
Fackrell, Bronwyn B.1
Khan, Khalidullah1
Milliman, Lisa J.1
Naranjo R., Victor Hugo1
more Creators »

Date

Date range begin – Date range end

Current results range from 1987 to 2005

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Decade

2000-20091
1990-19994
1980-19892

Degree Field

Animal Science6
Genetics1

Degree Level

Master's[remove]7

Degree Name

Master of Science (M.S.)7

Language

English [eng]7

Non-Academic Affiliation

Oregon State University. Graduate School7

Peer Reviewed

No6

Resource Type

Masters Thesis7

Rights Statement

Copyright Not Evaluated7

Subject

Lambs -- Carcasses2
Lambs -- Growth2
Sheep -- Reproduction2
Ewes -- Feeding and feeds1
Ewes -- Fertility1
more Subjects »

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