Effect of Supplemental Vitamin E and A on Reproductive Performance and Serological Profiles of Ewes Managed in Drylot

dc.contributor.author Raasch, Greg
dc.contributor.author Youngs, Curtis
dc.contributor.author Morrical, Dan
dc.contributor.author Youngs, Curtis
dc.date 2018-02-12T23:54:42.000
dc.date.accessioned 2020-07-02T06:25:28Z
dc.date.available 2020-07-02T06:25:28Z
dc.date.copyright Thu Jan 01 00:00:00 UTC 1998
dc.date.embargo 2012-08-13
dc.date.issued 1998
dc.description.abstract <p>Forty Hampshire and 40 Suffolk ewes were allotted to one of four groups (VitA, VitE, VitA&E, Control) in a 2 x 2 factorial treatment arrangement to evaluate the effect of supplemental vitamin E (0 or 300 IU) and vitamin A (0 or 250,000 IU) on reproductive performance. Laparoscopy and ultrasonography were used to measure ovulation rate, embryonic loss, and fetal loss. Serum profiles of a-tocopherol (vitamin E) and retinol (vitamin A) also were monitored. There were no differences (P>.05) among treatment groups in any reproductive trait. Suffolk ewes exhibited a higher (P<.02) ovulation rate than Hampshire ewes, and yearling ewes incurred higher (P<.001) embryonic loss than other age groups, resulting in a lower (P<.001) litter size. Serum levels of a-tocopherol were higher (P<.05) for Hampshire than for Suffolk ewes and were lower (P<.001) in yearling ewes versus ewes two years of age and older. Serum levels of a-tocopherol declined (P<.01) throughout the study in VitA and Control ewes but remained unchanged in VitE and VitA&E ewes. Serum level of retinol remained unchanged in VitA ewes, whereas the level increased (P<.01) initially in VitE, VitA&E, and Control ewes before declining toward initial levels. Correlations were detected between ovulation rate and the change of pre-mating a-tocopherol serum level (r=-.29; P<.02), the change in pre-mating retinol serum level (r=-.50; P<.02) and the interval from vitamin A injection (r=-.60; P<.05). These data indicate significant influences of breed, age, and treatment on a-tocopherol and retinol serum levels in ewes and suggest that the timing of vitamin A administration may influence ovulation rate; however, vitamin supplementation, administered at random stages of the estrous cycle, was unable to alter flock reproductive performance.</p>
dc.format.mimetype application/pdf
dc.identifier archive/lib.dr.iastate.edu/sheepreports_1997/9/
dc.identifier.articleid 1001
dc.identifier.contextkey 3209126
dc.identifier.s3bucket isulib-bepress-aws-west
dc.identifier.submissionpath sheepreports_1997/9
dc.identifier.uri https://dr.lib.iastate.edu/handle/20.500.12876/84643
dc.language.iso en
dc.relation.ispartofseries Animal Science Research Reports
dc.relation.ispartofseries ASL R1468
dc.source.bitstream archive/lib.dr.iastate.edu/sheepreports_1997/9/asl_1468.pdf|||Sat Jan 15 02:19:54 UTC 2022
dc.subject.disciplines Animal Sciences
dc.subject.keywords ASL R1468
dc.title Effect of Supplemental Vitamin E and A on Reproductive Performance and Serological Profiles of Ewes Managed in Drylot
dc.type article
dc.type.genre report
dspace.entity.type Publication
relation.isAuthorOfPublication 6f6f43a2-8eeb-44a8-928f-3cd9149f283f
relation.isSeriesOfPublication 7f3839b7-b833-4418-a6fa-adda2b23950a
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