Abstract
Timing of grazing termination is a key management variable in maximizing income from dual-purpose winter wheat enterprises. The objective of this research was to determine the effect of grazing hard red winter wheat pasture past first hollow stem (FHS) on steer BW gain and subsequent grain yield, and to develop production functions relative to time of grazing termination. Grazing trials were initiated at the emergence of FHS on March 13 and 5 of 2003 and 2005, respectively. Angus steers (greater than 7/8 Angus) grazed 4 clean-tilled, dryland winter wheat pastures in 2003 (n = 52; 405 ± 30 kg) and a single pasture in 2005 (n = 34; 357 ± 42 kg). Forage allowance averaged 199 kg DM/100 kg BW during 2003 and 133 kg DM/100 kg BW during 2005. Beginning in early February, grazing exclosures were set at approximately weekly intervals. Body weight of growing steers increased linearly (P < 0.01; Y = 392.2 + 1.58x) following FHS at the rate of 1.58 kg/d, and BW gain/ha averaged 147 kg over the 2 years. Grain yield responded quadratically (P < 0.01; Y = 2041.8 − 8.28x − 0.51x2) relative to days grazing past FHS. Grain yield decreased 10% by grazing 2 weeks past FHS, and an additional 10% for each of the next two weeks. Although the steers used in this study were heavy, their BW gain was excellent during the post-FHS grazing period, and reductions in grain yield were less than previously reported in the literature. These production functions should aid development of an economic model for evaluating grazing termination decisions in dual-purpose winter wheat enterprises.
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Claims 7
Claim · model-written summary
Body weight of growing steers increased linearly with days grazing past first hollow stem, at 1.58 kg/d.
Verbatim
e0“Body weight of growing steers increased linearly (P < 0.01; Y = 392.2 + 1.58x) following FHS at the rate of 1.58 kg/d”
Claim · model-written summary
Steer body weight gain per hectare averaged 147 kg over the 2 years.
Verbatim
e0“Body weight of growing steers”
e1“BW gain/ha averaged 147 kg over the 2 years”
Claim · model-written summary
Wheat grain yield responded quadratically to days of grazing past first hollow stem.
- Taxon
- wheat
Triticum aestivume0 - Treatment
- days grazing past FHSe2
- Outcome
- Grain yielde1
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“hard red winter wheat”
e1“Grain yield responded quadratically”
e2“days grazing past FHS”
Claim · model-written summary
Wheat grain yield decreased 10% by grazing 2 weeks past first hollow stem.
- Taxon
- wheatTriticum aestivume0
- Treatment
- grazing 2 weeks past FHSe1
- Outcome
- Grain yielde1
- Direction
- decreasede1
- Value
- 10%e1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“hard red winter wheat”
e1“Grain yield decreased 10% by grazing 2 weeks past FHS”
Claim · model-written summary
Wheat grain yield decreased by an additional 10% for each of the next two weeks of grazing.
- Taxon
- wheatTriticum aestivume0
- Treatment
- each of the next two weekse1
- Outcome
- Grain yielde1
- Direction
- decreasede1
- Value
- an additional 10%e1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“hard red winter wheat”
e1“Grain yield decreased 10% by grazing 2 weeks past FHS, and an additional 10% for each of the next two weeks”
Claim · model-written summary
Reductions in wheat grain yield were less than previously reported in the literature.
- Taxon
- Winter WheatTriticum aestivumt0
- Outcome
- reductions in grain yielde1
- Qualifier
- less than previously reported in the literaturee1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Winter Wheat”
e1“reductions in grain yield were less than previously reported in the literature”
Claim · model-written summary
Steer body weight gain was excellent during the post-first-hollow-stem grazing period.
Verbatim
e0“Although the steers used in this study were heavy, their BW gain was excellent during the post-FHS grazing period”
The same questions in other papers
grazing · yield · Triticum aestivum (wheat)Results differ
35 papers in the same direction as this paper · 34 in the opposite direction
- negative
- negative
- negative
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See all 70 papers →Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.