Graduate Thesis Or Dissertation

 

Creep-feeding to stimulate metabolic imprinting in nursing beef heifers : impacts on heifer growth, reproductive, and physiological parameters Public Deposited

Downloadable Content

Download PDF
https://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/6108vf036

Descriptions

Attribute NameValues
Creator
Abstract
  • The following experiment presented herein compared growth, physiological, and reproductive responses of beef heifers with (MI) or without (CON) access to a creep-feeder, as a manner to stimulate metabolic imprinting while nursing their dams. On d 0 of the experiment, 60 Angus × Hereford heifers were ranked by initial BW and age (140 ± 3 kg and 68 ± 3 d, respectively) as well as dam age and BCS, and assigned to pairs so all ranking criteria were similar between heifers within each pair. On d 1, pairs were randomly assigned to MI (n = 15) or CON (n = 15). From d 1 to 51, MI pairs and their dams were allocated to 15 drylot pens where heifers had ad libitum access to a corn-based supplement through a creep-feeder. The CON pairs and their dams were maintained in an adjacent single drylot pen. From d 52 to 111, cattle from both treatments were managed as a single group on a semiarid range pasture. On d 111, heifers were weaned and allocated to 2 pastures according to treatment, receiving hay and a corn-based concentrate until d 326. Full BW was recorded prior to (d -1 and 0) and at the end of the creep-feeding period (d 50 and 51), whereas shrunk BW was collected on d 112 and 326. On d 0, 51, 111, 187, 261, and 325, blood was collected and real-time ultrasonography for LM depth and backfat thickness assessment was performed. Blood was also collected every 10 d from d 113 to 323 for puberty evaluation via plasma progesterone concentrations. Liver and subcutaneous fat biopsies were performed on d 51, 111, 261, and 325. Average daily gain was greater (P < 0.01) for MI than CON from d 1 to 51, tended (P = 0.09) to be greater for CON than MI from d 112 to 326, whereas BW on d 326 was similar (P = 0.87) between treatments. On d 51, MI had greater (P ≤ 0.01) plasma IGF-I and glucose concentrations, as well as mRNA expression of hepatic pyruvate carboxylase and adipose fatty acid synthase than CON. On d 261 and 325, plasma insulin concentrations were greater (P ≤ 0.03) in CON than MI. Mean mRNA expression of hepatic IGF-I and adipose peroxisome proliferator-activated receptor gamma were greater (P ≤ 0.05) in MI than CON. Heifers assigned to MI attained puberty earlier (P = 0.04) during the experiment than CON, although age and BW at puberty were similar (P ≤ 0.74) between treatments. In conclusion, supplementing nursing heifers via creep-feeding for 50 d altered physiological and biochemical parameters suggestive of a metabolic imprinting effect, but did not impact heifer age or BW at puberty.
Resource Type
Date Available
Date Copyright
Date Issued
Degree Level
Degree Name
Degree Field
Degree Grantor
Commencement Year
Advisor
Committee Member
Academic Affiliation
Non-Academic Affiliation
Keyword
Subject
Rights Statement
Publisher
Peer Reviewed
Language
Replaces
Additional Information
  • description.provenance : Submitted by Maria De Meireles Reis (demeirem@onid.orst.edu) on 2014-12-05T22:29:38Z No. of bitstreams: 1 ReisMariaM2014.pdf: 617714 bytes, checksum: 9202ccb55ff8bd8506b5a7543d739d63 (MD5)
  • description.provenance : Made available in DSpace on 2014-12-09T16:35:35Z (GMT). No. of bitstreams: 1 ReisMariaM2014.pdf: 617714 bytes, checksum: 9202ccb55ff8bd8506b5a7543d739d63 (MD5) Previous issue date: 2014-12-02
  • description.provenance : Approved for entry into archive by Laura Wilson(laura.wilson@oregonstate.edu) on 2014-12-09T16:35:35Z (GMT) No. of bitstreams: 1 ReisMariaM2014.pdf: 617714 bytes, checksum: 9202ccb55ff8bd8506b5a7543d739d63 (MD5)
  • description.provenance : Approved for entry into archive by Julie Kurtz(julie.kurtz@oregonstate.edu) on 2014-12-08T19:38:21Z (GMT) No. of bitstreams: 1 ReisMariaM2014.pdf: 617714 bytes, checksum: 9202ccb55ff8bd8506b5a7543d739d63 (MD5)

Relationships

Parents:

This work has no parents.

Items