PMID- 30032212
OWN - NLM
STAT- MEDLINE
DCOM- 20190114
LR  - 20190929
IS  - 1525-3163 (Electronic)
IS  - 0021-8812 (Print)
IS  - 0021-8812 (Linking)
VI  - 96
IP  - 10
DP  - 2018 Sep 29
TI  - Feeding condensed tannins to mitigate ammonia emissions from beef feedlot cattle 
      fed high-protein finishing diets containing distillers grains.
PG  - 4414-4430
LID - 10.1093/jas/sky274 [doi]
AB  - Two experiments were conducted to determine the effects of feeding a condensed 
      tannin extract (CT) on dry matter intake (DMI), growth performance, carcass 
      traits, and NH3-N emissions of beef feedlot cattle fed high-protein barley-based 
      finishing diets. In Exp. 1, 36 crossbred steers (346 +/- 4.2 kg) were individually 
      fed 4 diets with 20% corn dried distillers grains (DG) and increasing 
      concentrations of a CT extract from Acacia mearnsii (black wattle) at 0%, 1.2%, 
      2.4%, and 3.5% of DM (9 steers per diet) for 52 d. The DMI was not affected at 
      1.2% and 2.4% but tended (P = 0.08, quadratic effect) to decrease at 3.5% CT 
      extract. There was no effect (P >/= 0.12) of increasing CT extract on ADG, but G:F 
      tended (P = 0.09) to decrease linearly. In Exp. 2, 148 crossbred steers (457 +/- 
      3.8 kg) were allocated to 16 pens with 4 pens per treatment in a completely 
      randomized design and fed for 83 d. The 4 dietary treatments included 0% corn DG 
      (0DG), 20% DG (20DG), 40% DG (40DG), and 40% DG with 2.5% CT extract (40DGCT) and 
      contained 13.3, 15.9, 20.4, and 19.4% CP, respectively. All cattle were weighed, 
      and blood was collected from 5 steers per pen every 3 wk. Ammonia emissions were 
      measured in four 3-wk periods using the integrated horizontal flux technique with 
      passive NH3 samplers from 2 pens of cattle fed 0DG and 20DG (Period 1), 40DG and 
      40DGCT (Period 2), 0DG and 40DG (Period 3), and 0DG and 40DGCT (Period 4). There 
      was no effect (P >/= 0.15) of diet on final body weight (621 +/- 7.1 kg), DMI (11.9 +/- 
      0.25 kg/d), ADG (1.98 +/- 0.07 kg/d), G:F (166 +/- 5.4 g/kg), and carcass traits. 
      Plasma urea N (PUN) increased (P < 0.001) from 0DG to 40DG (113 to 170 +/- 6.0 mg 
      N/L) and was reduced (P < 0.001) by 40DGCT (146 mg N/L) compared with 40DG and 
      tended (P = 0.09) to be reduced compared with steers fed 20DG (153 mg N/L). 
      Ammonia-N emissions were greater from cattle fed 40DG [113.7 vs. 70.8 +/- 4.57 g 
      N/(steer.d), P = 0.003] and tended to be greater from cattle fed 20DG [51.3 vs. 
      26.3 +/- 11.2 g N/(steer.d), P = 0.11] compared with 0DG. Cattle fed 40DGCT tended 
      to have lower NH3-N emissions compared with cattle fed 40DG [72.7 vs. 95.1 +/- 9.3 
      g N/(steer.d), P = 0.09 and 20.5 vs. 26.5 +/- 2.64% N intake, P = 0.11]. Feeding 
      2.5% CT to beef feedlot cattle fed a high-protein diet had no detrimental effect 
      on performance, reduced PUN indicating lower urinary urea N excretion, and 
      lowered NH3-N emissions by 23%.
FAU - Koenig, Karen M
AU  - Koenig KM
AD  - Agriculture and Agri-Food Canada, Lethbridge Research and Development Centre, 
      Lethbridge, Canada.
FAU - Beauchemin, Karen A
AU  - Beauchemin KA
AD  - Agriculture and Agri-Food Canada, Lethbridge Research and Development Centre, 
      Lethbridge, Canada.
FAU - McGinn, Sean M
AU  - McGinn SM
AD  - Agriculture and Agri-Food Canada, Lethbridge Research and Development Centre, 
      Lethbridge, Canada.
LA  - eng
PT  - Journal Article
PL  - United States
TA  - J Anim Sci
JT  - Journal of animal science
JID - 8003002
RN  - 0 (Proanthocyanidins)
RN  - 7664-41-7 (Ammonia)
RN  - 8W8T17847W (Urea)
RN  - N762921K75 (Nitrogen)
SB  - IM
MH  - Ammonia/*metabolism
MH  - Animal Feed/*analysis
MH  - Animals
MH  - Blood Urea Nitrogen
MH  - Cattle/blood/growth & development/*physiology
MH  - Diet, High-Protein/*veterinary
MH  - Edible Grain
MH  - Hordeum
MH  - Male
MH  - Nitrogen/urine
MH  - Proanthocyanidins/*pharmacology
MH  - Random Allocation
MH  - Urea/urine
MH  - Zea mays
PMC - PMC6162620
EDAT- 2018/07/23 06:00
MHDA- 2019/01/15 06:00
PMCR- 2019/09/29
CRDT- 2018/07/23 06:00
PHST- 2018/05/10 00:00 [received]
PHST- 2018/07/03 00:00 [accepted]
PHST- 2018/07/23 06:00 [pubmed]
PHST- 2019/01/15 06:00 [medline]
PHST- 2018/07/23 06:00 [entrez]
PHST- 2019/09/29 00:00 [pmc-release]
AID - 5055766 [pii]
AID - sky274 [pii]
AID - 10.1093/jas/sky274 [doi]
PST - ppublish
SO  - J Anim Sci. 2018 Sep 29;96(10):4414-4430. doi: 10.1093/jas/sky274.