Effects of ovariectomization and ractopamine hydrochloride inclusion on heifer feedlot performance, meat yield, and tenderness of select muscles

Effects of ovariectomization and ractopamine hydrochloride inclusion on heifer feedlot performance, meat yield, and tenderness of select muscles

Forty-eight British cross heifers were used to examine the effects of ovariectomization (OVX v. intact; INT) and ractopamine-HCl inclusion (0 or 0.41mg/kg of BWday−1; NORAC or RAC) for the final 31days on performance, meat yield, and tenderness of select muscles. Ractopamine supplemented heifers had...

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Bibliographic Details
Published in:Meat science Vol. 96; no. 1; pp. 73 - 81
Main Authors: Talton, C.S., Stelzleni, A.M., Shook, J.S., Hill, G.M., Kerth, C.R., Pence, M., Pringle, T.D.
Format: Journal Article
Language:English
Published: England Elsevier Ltd 01-01-2014
Subjects:
Adrenergic beta-Agonists - pharmacology
Animal Feed - analysis
Animals
Body Weight
Carcass characteristics
Cattle
Dietary Supplements
Female
Food Quality
Heifer
Meat - analysis
Muscle, Skeletal - drug effects
Muscle, Skeletal - metabolism
Organ Size
Ovariectomization
Ovariectomy
Phenethylamines - pharmacology
Ractopamine-HCl
Tenderness
Yield
Heifer
Ractopamine-HCl
Yield
Ovariectomization
Carcass characteristics
Tenderness
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Summary:Forty-eight British cross heifers were used to examine the effects of ovariectomization (OVX v. intact; INT) and ractopamine-HCl inclusion (0 or 0.41mg/kg of BWday−1; NORAC or RAC) for the final 31days on performance, meat yield, and tenderness of select muscles. Ractopamine supplemented heifers had heavier BW (P≤0.05) and greater dressing percent than NORAC. Dressing percent was also greater (P<0.01) for INT v. OVX. LM area tended to be larger for RAC (P=0.07) and was larger for INT (P=0.05). Neither ractopamine inclusion nor sex class affected (P>0.08) organ weights or percent intramuscular fat. Ractopamine inclusion increased (P≤0.05) subprimal weight for the shoulder clod and bottom round. However, ractopamine inclusion and sex class had minimal effects on subprimal yields or slice shear force. Heifers receiving ractopamine had increased BW, DP, carcass weight and select subprimal weights without impacting meat quality. Ovariectomization did not influence the affects of ractopamine supplementation. •Ovariectomization and ractopamine inclusion were examined in beef heifers.•There was no sex class by ractopamine inclusion interactions.•Ractopamine inclusion increased heifer BW, dressing percent, and carcass weight.•Ractopamine did not impact carcass quality traits or tenderness.•Ovariectomization of heifers did not influence the effects of ractopamine.
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ISSN:0309-1740
1873-4138
DOI:10.1016/j.meatsci.2013.06.016