Efficiency of energy and nitrogen loss and gain in mature cows

Journal of Animal Science
H C Freetly, J A Nienaber

Abstract

Our objective was to quantify the energy and nitrogen balances of mature cows fed a fixed amount of forage. Six cows were assigned to each of two treatments. At time 0, control cows received 83.55+/-.52 g of chopped brome hay x (BWkg)(-.75) x d(-1). Feed intake remained fixed (9,103+/-277 g/d) over the entire 224 d of the study. At time 0 treated cows received 82.10+/-1.26 g of chopped brome hay x (BWkg)(-.75) x d(-1) (9,083+/-113 g/d). After time 0, treated cows were offered 65% of the time-0 feed intake for the first 112 d (Phase 1) and 135% of the time-0 feed intake for the last 112 d (Phase 2). Treatments were designed so that the total amount of feed received during the 224 d was the same for each treatment. Additional balance measurements were made on d 28, 56, 84, 112, 140, 168, 189, and 224. Although treatment groups differed within phases for cumulative heat production, control cows did not differ from treated cows in total heat produced during the 224-d study (P = .60). Net retained energy over the entire 224-d period did not differ between treatments (P = .43). Treated animals retained more nitrogen than did control animals (P = .008). The increased efficiency of nutrient utilization during refeeding in cows allowed ...Continue Reading

Citations

Apr 3, 2007·Journal of Animal Science·T G Jenkins, C L Ferrell
Jan 15, 2009·Journal of Animal Physiology and Animal Nutrition·L O FiemsD L De Brabander
Apr 11, 2009·Journal of Animal Science·J F OdhiamboR A Dailey
Oct 21, 2015·Animals : an Open Access Journal From MDPI·Leo O FiemsSam De Campeneere
May 25, 2019·Translational Animal Science·Levi A TrubenbachJason E Sawyer
Aug 21, 2004·Journal of Animal Science·N A JanovickD G Morrical
May 16, 2006·Journal of Animal Science·H C FreetlyT Brown-Brandl
Aug 24, 2013·Journal of Animal Science·H C Freetly, T M Brown-Brandl
Aug 2, 2012·Journal of Animal Science·J T MulliniksM K Petersen
Jun 22, 2012·Animal : an International Journal of Animal Bioscience·T MorenoJ Mesas
May 29, 2015·Journal of Animal Science·H C FreetlyJ E Wells
Jan 14, 2020·Journal of Animal Science·Jessica R BaberKristin E Hales
Aug 4, 2020·Translational Animal Science·Caleb J BoardmanJason E Sawyer
Jul 26, 2006·Journal of Animal Science·H C FreetlyT Brown-Brandl
Apr 5, 2018·Journal of Animal Science·Courtney N HemphillKristin E Hales
Nov 14, 2007·Journal of Animal Science·H C FreetlyT Brown-Brandl
Jan 16, 2007·Journal of Animal Physiology and Animal Nutrition·L O FiemsD L De Brabander
Sep 18, 2021·BMC Research Notes·Hannah C Cunningham-HollingerAmanda K Lindholm-Perry

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