| Effects of sequential feeding of β-adrenergic agonists on cull cow performance, carcass characteristics, and mRNA relative abundance. | |
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MedLine Citation:
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PMID: 22147469 Owner: NLM Status: Publisher |
Abstract/OtherAbstract:
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The objectives of this study were to determine the effects of supplementation with a single or sequence of β-adrenergic agonists (β-AA) on cow performance, carcass characteristics, and mRNA relative abundance of cull cows implanted and fed a concentrate diet. Sixty cull cows were implanted with Revalor-200 (200 mg trenbolone acetate and 20 mg estradiaol) and assigned to 1 of 4 treatments (n = 15/treatment): C = fed a concentrate diet only; RH = supplemented with ractopamine-HCl (RH) for the last 25 d before harvest; ZH = supplemented with zilpaterol-HCl (ZH) for 20 d prior to a 3 d withdrawal before harvest; RH + ZH = supplemented with RH for 25 d followed by ZH for 20 d prior to a 3 d withdrawal before harvest. Ractopamine-HCl was supplemented at a dose of 200 mg·head-1·d-1 and ZH was supplemented at 8.33 mg/kg (100% DM basis) of feed. All cows were fed a concentrate diet for 74 d. Each treatment had five cows per pen and three replicate pens. On d 1, 24, 51, and 72, BW were collected. Muscle biopsies from the LM were collected on d 24, 51, and at harvest from a subsample of three cows per pen. Carcass traits were evaluated postharvest. The two ZH treatments averaged 15.3 kg more weight gain, 0.20 kg higher ADG, and 7.8 cm(2) larger LMA than C and RH treatments, and 21 kg more HCW than C but these differences were not significant (P > 0.10) likely due to sample size of n = 15/treatment. The sequence of RH followed by ZH tended to optimize the combination of HCW, LMA, % intramuscular fat, and lean color and maturity compared to the ZH treatment. Abundance of β(2)-adrenergic receptor (AR) mRNA was not altered in the RH + ZH treatment during RH supplementation from d 24 to 51 of feeding. However, the abundance of β(2)-AR mRNA increased (P < 0.05) the last 23 d of feeding for the RH treatment and tended (P = 0.10) to increase in ZH cows during ZH supplementation. For all cows, abundance of Type IIa myosin heavy chain (MHC-IIa) mRNA decreased (P < 0.05) after 24 d of feeding. Abundance of MHC-IIx mRNA increased (P < 0.05) for ZH and RH + ZH treatments the last 23 d of feeding during ZH supplementation. Although few significant differences were observed in performance or carcass traits, mRNA quantification indicated that β-AA supplementation elicited a cellular response in cull cows. Economically, implanting and feeding cull cows for 74 d, regardless of β-AA supplementation, added value by transitioning cows from a "cull" cow to what industry refers to as a "white" cow market in which cows have white fat resulting from grain feeding. |
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Authors:
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M J Weber; M E Dikeman; J A Unruh; J R Jaeger; L Murray; T A Houser; B J Jonhson |
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Publication Detail:
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Type: JOURNAL ARTICLE Date: 2011-12-6 |
Journal Detail:
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Title: Journal of animal science Volume: - ISSN: 1525-3163 ISO Abbreviation: - Publication Date: 2011 Dec |
Date Detail:
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Created Date: 2011-12-7 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 8003002 Medline TA: J Anim Sci Country: - |
Other Details:
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Languages: ENG Pagination: - Citation Subset: - |
Affiliation:
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Department of Animal Sciences and Industry, Kansas State University, Manhattan, Kansas 66506. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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