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- Title
Nutrient status of young postpartum range cows fed range supplements containing increased glucogenic precursors.
- Authors
Endecott, R. L.; Rubio, C. M.; Cox, S. H.; Rubio, M. R.; Lueras, R. B.; Cowboy, I.; Speckmann, R. D.; Löest, C. A.; Hawkins, D. E.; Petersen, M. K.
- Abstract
Consistent responses of young postpartum beef cows to protein supplementation could improve reproduction and cow sustainability. A 2-yr study conducted at the Corona Range and Livestock Research Center from February to July in 2003 (n = 51) and 2004 (n = 40) evaluated responses of 2- and 3-yr-old postpartum beef cows grazing dormant native range to three protein supplements with increasing glucogenic potential (GP). Supplements were fed at 1135 g•cow-1•d-1 twice weekly for approximately 70 d and provided 1) 341 g CP, 142 g ruminally undegradable protein (RUP), 57 g GP (RUP0), 2) 341 g CP, 151 g RUP + 80 g propionate salt (NutroCAL™, Kemin Industries, Inc.), 124 g GP (RUP80), or 3) 341 g CP, 159 g RUP + 160 g propionate salt, 192 g GP (RUP160). Weekly serum samples were composited and analyzed for glucose, non-esterified fatty acids (NEFA), and serum urea nitrogen (SUN). Supplement × yr interactions were observed for each metabolite (P ≤ 0.04). Cows fed RUP0 had higher glucose concentrations in 2004 than in 2003. In 2003, cows fed RUP160 had higher serum SUN concentrations than RUP80-fed cows; the opposite effect was observed in 2004. However, SUN concentrations for all cows were higher in 2004 than in 2003. Serum NEFA concentrations of RUP160-fed cows were higher in 2003 than in 2004. Cows fed RUP80 had the most consistent response, regardless of yr. Implications of this study suggest that cows fed the moderate level of GP were able to compensate for yr differences.
- Subjects
RANGELANDS; COWS; FATTY acids
- Publication
Journal of Animal Science, 2006, Vol 84, p454
- ISSN
0021-8812
- Publication type
Article