Show simple item record

dc.contributor.advisorCo-chairs, Graduate Committee: Glenn Duff and Janice G. P. Bowmanen
dc.contributor.authorSpence, Kaitlyn Claireen
dc.date.accessioned2014-12-18T18:09:25Z
dc.date.available2014-12-18T18:09:25Z
dc.date.issued2014en
dc.identifier.urihttps://scholarworks.montana.edu/xmlui/handle/1/8709en
dc.description.abstractThe objectives of these studies were to investigate the effects of feeding high-linoleic cracked safflower seeds on reproductive and performance outcomes in pubertal beef heifers. Three experiments were conducted at Montana State University research facilities (Exp. 1, n = 48, BW = 370 ± 24.8 kg; Exp. 2, n = 40, BW = 396.5 ± 31.7 kg; Exp. 3, n = 63, BW = 404.4 ± 26.14 kg). Angus and Angus crossbred heifers were stratified by BW and allocated randomly to the following experimental treatments; 1) fed 1.8 kg/d barley grain concentrate (Barley); or, 2) fed 1.8 kg/d of high linoleic cracked safflower seed (Safflower). Heifers were fed 35 and 29 d, Exp. 1, Exp. 2 and 3. Following the feeding period, heifers (Exp. 1 and 2) were artificially inseminated (AI) 12 h after the onset of estrus, and heifers that did not show estrus were administered 25 mg of PGF 2 alpha and time AI. A 7-d CO-synch + CIDR and TAI protocol was used for heifers in Exp. 3. Performance variables included initial and final BW, live wt gain, ADG, and DMI (Exp. 1 and 2). Biweekly blood samples were assayed for progesterone (P4) and PGF 2 alpha metabolites (PGFM) concentrations (Exp. 1). Estrus responses were observed using Estrotect tags, heifers with progesterone (P4) < 1 ng/mL were not included in the calculation. Pregnancy rates were determined 40 d post breeding. Performance variables did not differ between barley and safflower treatments with the exception of DMI in Exp. 2. Heifers supplemented with barley consumed 21% more (P < 0.001) DM per d than heifer fed safflower. In Exp. 1, overall pregnancy rates were greater in safflower supplemented heifers than in barley supplemented heifers (P = 0.036). Pooled PGFM concentrations differed by day (P < 0.05) in Exp. 1. Results suggest supplemental high linoleic safflower seed does not appear to influence estrus response or PGFM concentrations in pubertal beef heifers.en
dc.language.isoenen
dc.publisherMontana State University - Bozeman, College of Agricultureen
dc.subject.lcshHeifersen
dc.subject.lcshFeedsen
dc.subject.lcshEstrusen
dc.subject.lcshSaffloweren
dc.titleThe effects of feeding high-linoleic safflower seeds on estrus synchronization in beef heifersen
dc.typeThesisen
dc.rights.holderCopyright 2014 by Kaitlyn Claire Spenceen
thesis.catalog.ckey2656596en
thesis.degree.committeemembersMembers, Graduate Committee: James G. Berardinelli; Paul Grieco; Darrin Boss; Thomas Geary.en
thesis.degree.departmentAnimal & Range Sciences.en
thesis.degree.genreThesisen
thesis.degree.nameMSen
thesis.format.extentfirstpage1en
thesis.format.extentlastpage61en
mus.relation.departmentAnimal & Range Sciences.en_US


Files in this item

Thumbnail

This item appears in the following Collection(s)

Show simple item record


MSU uses DSpace software, copyright © 2002-2017  Duraspace. For library collections that are not accessible, we are committed to providing reasonable accommodations and timely access to users with disabilities. For assistance, please submit an accessibility request for library material.