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dc.contributor.advisorChairperson, Graduate Committee: Janice G. P. Bowman.en
dc.contributor.authorRagen, Devon Lynn.en
dc.date.accessioned2013-06-25T18:43:05Z
dc.date.available2013-06-25T18:43:05Z
dc.date.issued2012en
dc.identifier.urihttps://scholarworks.montana.edu/xmlui/handle/1/2093
dc.description.abstractSixty mature ewes (non-pregnant, non-lactating) were used in a completely randomized design to determine if feeding method of pea-barley forage (swath grazing or hay in confinement) had an effect on individual ewe mineral consumption and variation in supplement intake. Thirty ewes were randomly allocated to 3 confinement pens and 30 ewes were randomly allocated to 3 grazing plots. The study was conducted September 25 to October 15, 2010 and September 6 to 19, 2011. Targhee ewes (65.4 ± 5.84 kg BW) were used in 2010. Rambouillet ewes (61.9 ± 6.28 kg BW) were used in 2011. Ewes had ad libitum access to food, water, and a mineral supplement containing 11 to 12.5% salt with 2% titanium dioxide added as an external marker to estimate individual mineral intake. Forage intake was calculated using estimates of fecal output obtained by dosing gelatin capsules containing 2 g chromic oxide every day for 14 d, and in vitro 48-h DM indigestibility. Fecal grab samples were collected from each individual ewe for a period of 7 d and composited by ewe. Forage and mineral intakes were analyzed using individual ewe as the experimental unit. A year x treatment interaction (P < 0.01) existed for forage DMI and mineral DMI. Ewes in confinement consumed more forage than grazing ewes in 2010 (2.60 vs. 1.86 kg/d, respectively), but less than grazing ewes in 2011 (1.99 vs. 2.49 kg/d, respectively). Mean mineral intake was highest (P < 0.01) by grazing ewes in 2011 and 2010 (average 69 g/d), intermediate by ewes in confinement in 2010 (57 g/d), and lowest by ewes in confinement in 2011 (31 g/d). A year x treatment interaction (P = 0.05) existed for mineral DMI CV. Mineral DMI CV was higher (P = 0.04) for the confinement treatment than the grazing treatment in 2011 (67.2 vs. 33.7%), but similar for confinement and grazing treatments in 2010 (55.4 vs. 46.5%, respectively). In this study, both swath grazing ewes and ewes in confinement consumed more mineral than recommended by the mineral manufacturer and the NRC indicating that more research is needed to develop a better understanding of the factors that regulate and impact mineral intake.en
dc.language.isoengen
dc.publisherMontana State University - Bozeman, College of Agricultureen
dc.subject.lcshEwes Nutrition.en
dc.subject.lcshGrazing.en
dc.subject.lcshConfinement farms.en
dc.titleIndividual mineral supplement intake by ewes swath grazing or confinement fed pea-barley forage
dc.typeThesis
dc.rights.holderCopyright Devon Lynn Ragen 2012en
thesis.catalog.ckey1921362en
thesis.degree.committeemembersMembers, Graduate Committee: Patrick G. Hatfield; Rachel L. Endecott; Mark Petersenen
thesis.degree.departmentAnimal & Range Sciences.en
thesis.degree.genreThesisen
thesis.degree.nameMSen
thesis.format.extentfirstpage1en
thesis.format.extentlastpage48en
mus.identifier.categoryLife Sciences & Earth Sciences
mus.relation.departmentAnimal & Range Sciences.en_US
mus.relation.universityMontana State University - Bozemanen_US


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