Paper: Cereal Silage Options for Western Canada

Take Home Message

• Cereal crops provide producers with a lot of options that allow the producer to balance silage yield, quality, harvesting and storage.
• Producers must look at species, varieties and mixtures as ways of controlling silage quality.
• In monocrops, the stage of harvest should be at the soft-dough stage. In mixtures, the later maturing component at the soft-dough stage will give highest yield and energy and if harvested when the earliest component is at the soft-dough stage, protein content will increase.
• Disease factors are important considerations. Rotate your crops and varieties to guard against the build up of new diseases or disease races.

Silage Quality

Silage making is less dependent upon good weather than haying, giving more control over quality. Producers have found over the years that barley provides on average a better quality product than other cereals. Barley makes up over 85% of the annual cereal silage production. However, from time to time we see pushes to grow other cereal crops or corn depending on the year and location. It is difficult to obtain good data to compare yield or quality due to the environmental differences from location to location and from year to year.

The data presented in this paper are the most recent data from our trials at Lacombe where we are able to obtain reliable data from tests grown under the same fertility and moisture conditions. We have tested primarily barley, spring triticale and winter triticale over the years with oat, spring wheat and fall rye as checks. This data shows the same trends as the studies by Khorasani et al. (1997) that examined the influence of stage of maturity on the chemical composition of alfalfa, oat, barley and triticale silage. Their results indicated that as the crop matured and dry matter increased, the protein content decreased. Acid detergent fiber (ADF) and neutral detergent fiber (NDF) increased until about 3 weeks after boot stage and then declined due to the increase of starch in the seed. Acid detergent lignin (ADL) steadily increased as the plant matured in all crops except barley, which peaked at approximately 2 to 3 weeks post-boot stage and then declined. This is most likely due to dilution effect from the grain but is not seen as dramatically in the other cereals.

Baron et al. (1999) evaluated the quality of forage taken at 10 days post anthesis and at early dough stages of growth for barley, oat and triticale (Table 1). This data is showing the same trends as that of Khorasani et al. (1997).

Table 1. Average silage quality for barley, triticale and oats grown at Lacombe in 1995-1996 (from Baron et al 1999).

Species		Date		ADF		NDF		Lignin		IVDOM		Protein
Barley		D1		34.6		59.0		4.1		69.9		13.2
Barley		D2		26.6		51.7		3.8		67.3		10.7
Oat		D1		36.5		61.5		5.0		67.3		10.5
Oat		D2		34.0		60.3		5.3		62.2		9.9
Triticale		D1		33.7		58.0		4.7		68.8		11.6
Triticale		D2		27.6		52.6		4.2		66.8		9.4
D1 - Ten days post anthesis D2 - Early dough stage

Juskiw et al. (2000b) reported on the components of the biomass relating to leaf, stem and spike for barley, oat and triticale (Figure 1). It is generally accepted that the leaf is important in the protein quality and the spike is important in the energy factor while the stem contains more of the fiber and lignin. Their data indicated that the winter cereals represented by 'Prima' rye and 'Pika' triticale had the highest percent of stem followed by 'Seebe' two-row barley. These cereals also had the lowest percent of spike. The six-row barley 'Kasota', 'AC Lacombe' and 'Noble' had the highest percent of spike. The oat 'AC Mustang', the spring triticale 'Wapiti' and the two-row barley 'Seebe' had the highest percent leaf.

Figure 2 gives an indication of the range of quality that can be found between species when harvested at the soft-dough stage. This indicates that there is a great deal of range within the species and if you tie this to the stage of harvest one can expect to make high quality silage out of any of these crops provided they are properly handled and processed.

Silage Yield and Agronomics

One of the primary factors that producers consider when selecting a species or a variety is yield, however as stated before, some agronomic factors are often considered as more important. One of these factors is lodging resistance or straw strength. Another is rough or smooth awn.

Firstly, consider silage yield. Triticale outyields both oat and barley silage harvested at early and late stages of growth (Figure 3). Silage yield of barley and oat is equal at the early dough stage but oat outyields barley when harvested 10 days post-anthesis (Baron et al. 1999). What this data does not explain is that the barley is ready for harvest two to three weeks earlier than the oat and triticale.

Our research indicates that there is considerable range in the dry silage yields and the grain yields of both barley and triticale (Table 2). While the average triticale yields are greater than barley there is considerable overlap in the range (Figure 4).

Table 2. Dry silage yield and grain yield for different lines* of triticale and barley grown at Lacombe, AB in 1998-2001.

TRITICALE **				BARLEY
Variety	Dry Silage Yield (kg/ha)	Dry Grain Yield (kg/ha)			Variety	Dry Silage Yield (kg/ha)	Dry Grain Yield (kg/ha)
AC Alta	16137	8789			AC Lacombe	14490	8226
Pronghorn	15910	9658			CDC Dolly	13685	7227
Sandro	15395	9062			Falcon	12221	6888
AC Ultima	12938	9427			Harrington	13451	5866
94L039007	12858	9061			Vivar	14675	8617
94L044006	13066	8354			H89012001	14008	8543
94L044009	13220	9630			H89020001	12960	6963
97O019	13856	8299			H90009012	12945	5500
98P015	12812	9100			H90013004	14537	8827
88L012053	15271	8413			H91010014	14337	7147
88L012114	14719	8419			H92020115	12922	6201
92L012010	14428	7582			H92031021	13625	6992
93L016002	14853	8802			H93003006	14046	6783
94L037009	14722	9433			H93040038	10943	6607
94L043014	14335	8574			H93040116	11754	6712
94L043015	14615	8646			H93167228	13808	6398
94L043017	14666	8402			H93170006	13187	6908
94L043019	15124	9012			T89037005	14056	7770
94S001008	14149	7879			T89047103	12859	7153
89L003006	13408	8111			W91201005	12418	6290
Minimum	12812	7582			Minimum	10943	5500
Maximum	16137	9658			Maximum	14675	8827
Average	14324	8733			Average	13346	7081

* Numbered lines are breeding lines from advanced trials and give an indication of genetic variability.
** 20 lines from a larger study representing the advanced material with the best garin yields.

Grain yield and silage yield is correlated (Figure 5 and Figure 6) for both barley and triticale. It has often been said that the highest yielding grain varieties are also the best silage varieties. This is generally true, but when it is not true we can usually determine a genetic or morphological factor that changes this relationship. Some of these factors are maturity, plant height, leaf area, and straw strength.

The old rule of thumb on maturity was that one-day difference in maturity was worth 2% yield. However, 'Kasota' which is 5 to 10 days earlier than 'AC Lacombe', is equal in grain yield but much lower in silage yield. In Figure 1 we see that at the silage stage, both 'Kasota' and 'Noble' had a high % spike. At maturity, 'Kasota' would have a larger percentage grain (50 to 55 % spike) compared to 'Noble' and 'AC Lacombe' (45 to 50% spike).

Plant height is often considered important in silage varieties. But in actual fact a semi-dwarf variety that has more
tillers and spikes has the same or higher leaf and equal or lower stem. If high levels of manure are factored in and lodging becomes a problem, then harvested yield of the standing crop is often better for semi-dwarf varieties than the tall varieties. Often semi-dwarf varieties end up with higher protein content. This is due to the fact that on a shorter stem there are still the same numbers of leaves. This is somewhat offset by the thicker stems on the semi-dwarfs. We can increase the amount of leaf in the silage by cutting early but we do it at the expense of yield and energy. In addition, some varieties have been observed to keep green leaves longer and seem to ripen from the top down while others senesce from the bottom up so that the bottom leaves are gone before the soft-dough stage is reached.

Another factor to consider is disease resistance. 'Seebe' may have a higher percent leaf due to its extremely high level of leaf disease resistance. As disease reduces the photosynthetic area of the plant it also reduces yield. What the feed value differences are between diseased leaves with high levels of fungi compared to healthy leaves is not known.

Varieties for Silage - a Grain and Biomass Comparison

It is evident that any cereal species or variety can be used for quality silage. However, if the aim is high protein and low fiber the crop must be taken at the proper stage of growth. We recommend harvest at the soft-dough stage to get maximum yield and quality. Ranking the cereals at this growth stage for silage quality, barley is the highest, followed by triticale, then wheat, and oat has the lowest quality.

Depending on moisture and fertility, a semi-dwarf with strong straw will outperform a tall type under high yielding conditions. Smooth awned varieties may have an advantage over rough awned types if the crop is dry for the ensilaging process or the chop length is not giving proper ensiling.

Producers should try to rotate varieties that have different disease resistance to ensure the crop is protected. One of the diseases that is now threatening cereal production on the prairies is Fusarium Head Blight. The disease can be severe on crops following an infected crop. Corn is especially susceptible and growing wheat or barley after a corn crop could be the formula for seeing this disease increase across western Canada.

Use of Crop and Varietal Mixtures

The use of mixtures for silage production should be considered. This is often done for a number of reasons. The best reasons are for increasing the window of quality, for disease control and for lodging control. Juskiw et al. (2000a) concluded, "species mixtures could be a means for producers to extend their window of harvest for silage, while improving the quality of that harvest. The interspecific mixture of oat and barley, when harvested at the soft-dough stage of the barley, gave higher yields and quality than the barley or oat monocrops." The intraspecific mixture of 'Kasota' (early maturing) and 'Seebe' (late maturing) barley, when harvested at the soft-dough stage of 'Seebe' tended to have higher yields than the monocrops (Juskiw et al. 2000a).

The planting of triticale and pea blends is a popular option in some areas for dairy silage. As well, the blend of barley and triticale can work to produce high quality silage. Blends of varieties with different genes for disease resistance can also lessen the impact of diseases on yield and quality.

Conclusion

Cereal crops give the producer a range of choices, allowing the producer to balance yield, quality, harvesting and storage. Producers must look at species, varieties and mixtures as ways of controlling silage quality. In monocrops the stage of harvest should be at the soft-dough stage. In mixtures the later maturing component at the soft-dough stage will give highest yield and energy and if harvested when the earliest component is at the soft-dough stage, protein content will increase. Disease factors are important considerations. Rotate your crops and varieties to guard against the build up of new diseases or disease races.

References

• Baron, V.S., D.F. Salmon and G. McLeod. (1999) The evaluation of spring and winter triticale varieties (and novel lines) for forage quality. Alberta Agricultural Research Institute (AARI) Report #95M788.
• Juskiw, P.E., J.H. Helm and D.F. Salmon. (2000a) Forage Yield and Quality for Monocrops and Mixtures of Small Grain Cereals. Crop Sci. 40:138-147.
• Juskiw, P.E., J.H. Helm and D.F. Salmon. (2000b) Postheading Biomass Distribution for Monocrops and Mixtures of Small Grain Cereals. Crop Sci. 40: 148-158.
• Juskiw, P.E., J.H. Helm and D.F. Salmon. (2000c) Competitive Ability in Mixtures of Small Grain Cereals. Crop Sci. 40:159-164.
• Khorasani, G.R., E. Okine, J.J. Kennelly, and J.H. Helm. (1993) Effects of Substituting Whole Crop Cereal Silage for Alfalfa Silage on Performance of Lactating Dairy Cows. J. Dairy Sci. 76:3536-3546.
• Khorasani, G.R., P.E. Jedel, J.H. Helm, and J.J. Kennelly. (1997) Influence of Stage of Maturity on Yield Components and Chemical Composition of Cereal Grain Silages. J. Dairy Sci. 80:259-267.