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ABSTRACT
Objective
The objective of this study was to evaluate the effects of maturity at harvest of
cereal crops on biomass, quality, cow performance, and economics.
Materials and Methods
In each of 3 yr, a 48-ha field was divided into 3 paddocks (16 ha per treatment) and
seeded to either barley (Hordeum vulgare CDC Maverick, 135 kg/ha), oat (Avena sativa CDC 29 SO1, 135 kg/ha), or triticale (Triticosecale Taza, 135 kg/ha). Half of each field (8 ha) was swathed at either soft dough (SDo)
or hard dough (HDo) stage for grazing. Each year, 120 dry pregnant beef cows (631
kg) were randomly allocated to 1 of 6 replicated (n = 2) paddocks for 90, 106, and
88 d in yr 1, 2, and 3, respectively.
Results and Discussion
Triticale had 19 and 23% greater total yield than oat and barley, respectively. Barley
CP was greater (P < 0.05; 10.9%) than oat (9.3%) or triticale (9.8%) at HDo stage. The animal unit
months (AUM) per hectare were greater for HDo (11.5 ± 0.8 AUM/ha) than SDo (9.15 ±
0.8 AUM/ha) stage. Cow ADG was greater (P = 0.01) for barley (0.61 kg/d) compared with triticale (0.39 kg/d). Total crop cost
averaged Can$426, Can$437, and Can$458/ha for oat, barley, and triticale, respectively.
The HDo stage had Can$0.40 lower dollars per cow per day in-field costs (P = 0.02) than the SDo stage and 10% (Can$26.25 per cow/d) lower feeding costs (P = 0.02) over 3 yr.
Implications and Applications
Delaying harvest to hard dough can increase yield and reduce feeding costs without
affecting cow performance.
Key words
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Footnotes
The authors have not declared any conflicts of interest.
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