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Does Supplemental Protein and Rumen-Protected Methionine Improve Performance and Digestibility During Late Gestation in Beef Cows?

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Title: Does Supplemental Protein and Rumen-Protected Methionine Improve Performance and Digestibility During Late Gestation in Beef Cows?
Author: Collins, Madeline; Shoveller, Anna Kate; Mandell, Ira; lawson, Kaitlyn; Lievre, Michaela; Wood, Katharine
Department: Department of Animal Biosciences
Program: Animal and Poultry Science
Advisor: Wood, Katharine
Abstract: The objective of this study was to determine if supplemental protein and rumen-protected methionine (MET) improve cow performance and apparent total tract digestibility (TTD) during late gestation. Pregnant beef cows (n=99) and heifers (n=39) were randomly assigned to one of six diets formulated to meet 90, 100, or 110% of metabolizable protein (MP) requirements (NRC, 2016), with(without) 9 g/d of rumen-protected MET (Smartamine®M, Adisseo Inc.). Cows fed at 90% MP requirements lost body weight (BW), pregnancy corrected BW, and had reduced TTD (P<0.05). Supplemental MET did not affect cow performance; however, MET supplementation increased glucose and reduced EAA, BCAA, and ketogenic AA serum concentrations (P≤0.02). Calf birth weights were not impacted by dietary treatment. Thus, feeding cows below their MP requirements may limit late gestation performance and TTD. Supplemental MET may increase amino acid utilization but did not improve beef cow performance or digestibility parameters measured in late gestation.
URI: http://hdl.handle.net/10214/17463
Date: 2019-09
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