Forage crops
Toshihiko Yamada
Laboratory of Bioresource Exploitation and Utilization Research
Field Science Center for Northern Biosphere
Hokkaido University
Email:yamada@fsc.hokudai.ac.jp

Chapter 4
Forage Crops
Toshihiko Yamada
Grassland farming is one of the important activities in Hokkaido’s agriculture.
Grasslands cover 45% of cultivated area of Hokkaido. About 83% of thegrasslands of Japan are in Hokkaido alone (Fig. 4-1). In eastern and northern
Hokkaido where rice cultivation can not be undertaken due to cool climate, dairy
farming based on grasslands is the major agricultural activity. It accounts for
91.5% of the total agricultural output. Size of dairy farms in these districts iscomparable to those of European countries. Grasslands in Hokkaido consist of
perennial forage grasses such as timothy and orchardgrass, and perennial
forage legumes such as white clover, red clover and alfalfa. In upland areas
such as Tokachi district, maize is grown as an annual forage crop for use as
silage for animal feed. In this chapter, forage crops cultivated in Hokkaido aredescribed.
1. History of Hokkaido’s grasslands
The cultivation of forage crops in Hokkaido was first recorded in 1869.
Gaertner, a Prussian (now German), cultivated some forage crops in Nanae
near Hakodate. At the Sapporo Agricultural College (now Hokkaido University)
the cultivation of forage crops whose seeds had been imported by Dr. William S.
Clark from Massachusetts, USA was started in 1877. Dr. Edwin Dun (Fig. 4-2),
who has been called the father of Hokkaido’s dairy farming, established the
Makomanai Livestock Farm in 1876. In 1887, forage crops were cultivated atseveral livestock farms in Hokkaido. In those days, forage grasses such as
timothy and orchardgrass were grown in grasslands. Timothy was grown mainlyfor production of hay for use as feed of horses. Orchardgrass was used for both
hay production and grazing by cattle. However, after the World War II, due todecrease in horse population cultivation of timothy declined. In 1955, thegrassland area was only 80,000 ha. During 1960’s, the consumption of animal

4-1

Grassland

Upland523,000 ha(45%)

416,000 ha
(36%)

Paddy
Field

227,000 ha(19%)

Cultivated area of Hokkaido 1,166,000ha(25% in Japan)
Fig.4-1. Cultivated area in Hokkaido.

Fig.4-2. Edwin Dun Memorial Museum at Makomanai,
Sapporo. The materials used at Makomanai Livestock
Farm in those days are displayed.

4-2

products such as milk and meats increased drastically due to the influence ofwestern life-style and economic development. After 1956, grasslands weredeveloped on a large scale in eastern Hokkaido with the support of Japanese
government and World Bank. So called ‘Pilot Farm Program’ was carried out
using big machinery to develop grasslands. Later, a number of grasslands were
established every year, which had an area over 500,000 ha by the end of 1980’s(Fig. 4-3). In the 1970’s, for the establishment of grasslands in the eastern
Hokkaido near Abashiri, orchardgrass was cultivated, because of its high forage
yield. But, in 1975, severe winter conditions of the region killed orchardgrass
plants in many swards. Subsequently, cultivation of timothy, a winter hardy
species, was undertaken in this region, and now it covers more than 70% of thegrasslands of Hokkaido. Timothy has high forage quality and is a suitable feed
for high milk yielding cows (super cow); thus it is a preferred forage crop forgrasslands.
2. Forage crops
Table 4-1 shows the current acreage of forage crops in Hokkaido.
Perennial forage crops as well as annual maize are important for forage
production in Hokkaido.
(1) Perennial forage crops
Timothy and orchardgrass are cool season grasses. These are cultivatedas important perennial forage crops in Hokkaido. Hokkaido has two distinct
climate zones. During winter, the western Hokkaido has thick snow cover(non-frozen soil zone); thus orchardgrass and perennial ryegrass are grown
there. The eastern Hokkaido has less snow cover (frozen soil zone). Here
winter hardy species such as timothy and meadow fescue are common (Fig.
4-4). Perennial forage legumes such as red clover, white clover and alfalfa areusually cultivated as a mixture with grasses. They play an expanded andinvaluable role in the nitrogen economy, animal productivity and sustainabilityof grasslands.
Main perennial forage crops grown in Hokkaido are listed below.
1) Timothy:

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Fig. 4-3. Grassland in the eastern Hokkaido -view from an
observatory point, ‘Kaiyou-dai’ in Nakashibetsu-town.
Table 4-1. Acreage of forage crops in 2006 (ha).
Japan

Hokkaido

Forage grasses & legumes

787,300

569,700

Maize

85,20036,600

Sorghum

34,300158

Oat & Rye

62,08045,618Forage turnip339

0

Others27,381

10,024

Total

996,600

662,100

West area

East area(Snowing Area)(Low temperature area)

Orchardgrass
Perennial ryegrass

Mountains
Timothy
Meadow fescue

SapporoFig. 4-4. Two different climate conditions in winter anddistribution of cultivated grasses.

4-4

Scientific name: Phleum pratense L.
Japanese name: Oh-awagaeri
Timothy (Fig. 4-5) is the most important grass in the Hokkaido region andnow occupies more than 70% of Hokkaido’s grasslands. This species is well
adapted to humid and temperate area with severe winters, and thus does not
grow under dry or hot conditions. Timothy is one of the most winter-hardy
cool-season grasses. LT50 (the temperature at which half of plants are killed)
was lower than -25oC for samples of timothy collected in December (Fig. 4-6).
Thus timothy can be cultivated steadily in the coldest areas of the eastern
Hokkaido. It is used mostly for hay and silage. Timothy has high palatability
and forage quality. However, it has poor re-growth after cutting. It is notsuitable for grazing pasture. It is very compatible with red clover.
In the past, early flowering cultivars of timothy had been popular in
Hokkaido. Delayed harvest due to simultaneous heading and flowering often
results in lower forage quality. Forage quality reduces drastically after
flowering. Therefore, intermediate and late flowering cultivars of timothy havebeen developed. Now cultivars with different maturity periods are available(Fig. 4-7). Thus, now a farmer can harvest timothy grasslands at the optimaltime.
2) Orchardgrass (Alias: Cocksfoot)Scientific name: Dactylis glomerata L.
Japanese name: Kamogaya
Orchardgrass (Fig. 4-8) is well adapted to humid and temperate regions.
It has moderate tolerance to heat and drought, and higher shade tolerance
than most of other forage grasses. LT50 of orchardgrass is higher than that oftimothy (Fig. 4-6). It can not survive severe winters of the eastern Hokkaido.
Orchardgrass shows high yield and good response to fertilizers. It has
relatively good palatability and forage quality. Orchardgrass is used primarily
for hay and grazing pasture. It is compatible with alfalfa, white clover and red
clover.
Area under orchardgrass in Hokkaido has declined in the past three
decades because of its relatively poor winter hardiness and decrease in the

4-5

Fig. 4-5.

Timothy.

△：Timothy (Senpoku)●: Orchardgrass (Okamidori)○：Orchardgrass (Akimidori)□：Perennail ryegrass (Revelle)Fig. 4-6. LT50 (the temperature at which half of plants
is killed) in three species of grasses.

Extreme
early

Early

Intermediate

Late

9 June19 June24 June26 June

4 JulyKunppuNosappu
Senpoku

Akkeshi

Kiritappu

Natsusakari

Data in Kunneppu-town

Fig. 4-7. Ear emergence in timothy cultivars released
at the Hokkaido Pref. Kitami Agric. Exp. Station.

4-6

forage quality resulting from delayed harvest. However, recently orchardgrasshas gained attention due to its high productivity and earlier heading timecompared to timothy. Keeping in view the growing periods of timothy andorchardgrass, grasslands with a combination of these two may result in highherbage production.
3) Perennial ryegrass
Scientific name: Lolium perenne L.
Japanese name: Hoso-mugi
Perennial ryegrass (Fig. 4-9) is the most important grass species inwestern Europe and New Zealand. In Hokkaido, its use as forage has been
limited to the northern Hokkaido, Tenpoku area which is a non-frozen soil zone
due to heavy snow cover. It does not tolerate low fertility, drought and heat stress,
as well as severe winters of eastern Hokkaido. LT50 of perennial ryegrass issubstantially poorer than that of timothy and orchardgrass (Fig. 4-6). This
species has high digestibility and palatability as well as resistance to treading bygrazing animals. It is grown in gazing pasture mainly as mixture with white clover,but is also used for hay and silage production.
4) Meadow fescue
Scientific name: Festuca pratensis Huds.
Japanese name: Hiroha-no-ushinokegusa
Meadow fescue (Fig. 4-10) has characteristic good re-growth after cutting
and winter survival. This species is generally grown mixed with orchardgrass
and timothy as a companion crop in Hokkaido. However, this is also a
promising grass for grazing pasture in eastern Hokkaido where cultivation of
perennial ryegrass is difficult.
5) Alfalfa (Alias: Lucerne)
Scientific name: Medicago sativa L.
Japanese name: Murasaki-umagoyashi
Alfalfa (Fig. 4-11) is called ‘Queen of forage’ because of its good forage
quality and high protein content. It does best on soil with fine to medium

4-7

Fig. 4-8.

Orchardgrass.

Fig. 4-9. Perennial ryegrass.

Fig. 4-10.

Meadow fescue.

4-8

textures that are moderately to well drained and neutral or alkaline. It tolerates
drought and is very winter hardy. Alfalfa is well adapted in the USA. However, it
is not adapted so well in Hokkaido due to acidic and wet soil conditions. But
breeding has led to the development of cultivars adapted to Hokkaido
conditions. New cultivars, ‘Makiwakaba’ and ‘Haruwakaba’ have shown good
performance in Hokkaido region and area under these cultivars has increased.
Mono-cultivation as well as mix-sowing of alfalfa with grasses such asorchardgrass is practiced. Alfalfa is mainly used for silage production. It is notsuitable for grazing.
6) White clover
Scientific name: Trifolium repens L.
Japanese name: Shiro-tsume-gusa
White clover (Fig. 4-12) is the most important forage legume for mix-sowing
in temperate grasslands of the world. It is well adapted to humid temperate
climate. White clover is grown throughout Hokkaido. Cultivars are classified forleaf size: small (wild), medium (common) and large (ladino). Small types are
dwarf and have very prostrate habit, and are not very productive. These areused for intensive grazing pasture. Medium types are intermediate in size
between small and large types, and are used for silage or grazing pasture.
Ladino types have larger leaves and longer petioles, and are more productive.
These are used for hay and silage production.
7) Red clover
Scientific name: Trifolium pratense L.
Japanese name: Aka-tsume-gusa
Red clover (Fig. 4-13) is a short-lived perennial forage legume widelydistributed in temperate grasslands. It has good winter hardiness, but poor
tolerance to high temperature and drought. This species is grown throughout
Hokkaido. Cultivars are classified into two growth habits, medium andmammoth. Medium types flower earlier and produce two or three harvests,
while mammoth types flower much later and typically produce a single harvest.
Red clover has high palatability and nutritive value. Its poor persistence (only

4-9

Fig. 4-11. Alfalfa.

Fig. 4-12. White clover.

Fig. 4-13. Red clover.

4-10

two to three years), however, is disadvantageous. It is used for hay and silage
production, and also for grazing.
8) New forage species
A new forage legume ‘Galega” (Galega orientalis Lam.) has been recently
introduced from Estonia and registered as a recommended forage cultivar for
Hokkaido (Fig. 4-14). This species shows good persistency and highadaptability under mixed cultivation with timothy in Hokkaido. However, it has
slow establishment, which needs to be improved through breeding.
(2) Annual forage crops
In Japan, corn (maize) and sorghum are important annual forage crops.
Maize is grown mainly in Hokkaido in an area of 36,600 ha. It is mainly
cultivated on uplands in the Tokachi district. In Hokkaido, sorghum is grown ina very limited area because it requires warm temperature in summer. Rye andoat are also cultivated as forage crops, but currently their acreage is not large.
Therefore, only corn is described here.
1) Corn (Alias: Maize)
Scientific name: Zea mays L.
Japanese name: Toumorokoshi, Toukibi
Corn (Fig. 4-15) is world’s third leading cereal crop, after rice and wheat.
However, unlike rice and wheat, corn is consumed mainly as feed for livestockrather than as human food. Corn is often classified into six groups based uponendosperm characteristics. These are dent, flint, flour, pop, sweet and waxy
corns. Sweet corn has high sugar in kernels and is grown for humanconsumption. Dent and flint corns are mainly used for animal feeds. About
40% of the world’s corn is grown in the USA, and mainly (over 90%) for grain.
But in Japan including Hokkaido, corn is cultivated for the production of silage.
The whole plants are harvested when kernels are in yellow-ripe stage. Allcommercial cultivars are hybrids. Mainly early maturing (75-110 days) hybrids
are grown because in Hokkaido accumulated temperatures during growing
season (16 May–10 Oct) are low (2,000 – 2,500 oC). In eastern Hokkaido, very

4-11

Fig. 4-14. New forage legume Galega in Hokkaido(Photograph by Dr. K. Okumura).

Fig. 4-15. Corn field in Tokachi district (Photograph by Dr. K. Koinuma).

4-12early maturing types (75 days) are cultivated. Seeds of many hybrid cultivars
come from the USA and Europe. Sweet corn is also cultivated in Hokkaido.
3. Breeding program
Plant breeding is the intentional genetic manipulation of plant species inorder to create desired phenotypes for specific purposes. Improvement ofvarious agronomical characters such as yield, quality, and disease and insect
resistance by breeding is essential for stable and high production.
Breeding programs on orchardgrass, meadow fescue, alfalfa, redclover, and white clover are now carried out at the National Agricultural
Research Center for Hokkaido Region (NARCH). Breeding of timothy is doneat the Hokkaido Pref. Kitami Agric. Exp. Station (timothy), and also by some
private companies. Main breeding objectives for perennial forage crops are
winter hardiness, yield, forage quality, persistency and disease resistance.
Evaluation of plants/accessions introduced or collected from Hokkaido region
and foreign countries is undertaken at experimental fields (Fig. 4-16), andsuperior genotypes with desired characteristics are selected. New breedinglines thus developed at the breeding stations are tested for local adaptationand specific characteristics such as suitability for grazing and cold toleranceetc., at several experimental sites throughout Hokkaido (Fig. 4-17). Based on
the data from these evaluations, high performing breeding line(s) areregistered as a recommended variety(ies) for general cultivation in Hokkaido.
(1) Perennial forage crops
Many forage crops are polyploids and obligate out-breeders. Conventional
breeding of forage crops is mainly based on synthetic varieties developed
through poly-crosses among superior selected genotypes (Fig 4-18).
1) Timothy
Recent breeding objectives of timothy are lodging resistance,mix-sowing ability with forage legumes, re-growth in summer and good seedproduction. Lodging results in bad forage quality. Lodging resistance is alsoessential for mechanical harvesting.

4-13

Fig. 4-16. Experimental field forselection of timothy. Hokkaido
Pref. Kitami Agric. Exp. Station.

Fig. 4-17. Experimental field for
local adaptability test of timothy.
Hokkaido Pref. Konsen Agric. Exp.
Station.

Half-seb family
recurrent selection

Synthetic variety
methodevaluation
evaluation
polycrosspolycrossprogeny test

Varietypolycross

Varietyprogeny test

Fig 4-18 Breeding methods in perennial forage crops.

4-142) Orchardgrass
Water soluble carbohydrate (WSC) is an important trait for the nutritive
value of forages because of its relation to palatability, digestibility andfermentation quality of silage. The WSC content and its composition are also
correlated with freezing tolerance. The WSC content of orchardgrass is lower
than that of other temperate grasses. Thus at NARCH the breeding programaims at increasing the content of WSC, and some promising breeding lines
with high content of WSC have been developed. A new orchardgrass cultivar
with high WSC content is likely to be released soon. There is generally anegative correlation between freezing tolerance and plant vigor in autumn (Fig.
4-19).

Recently, a new cultivar ‘Harunemidori’ with both good winterhardiness and high production in autumn has been released. This cultivar
showed a rapid increase in freezing tolerance in late autumn (Fig. 4-20).
‘Harunemidori’ is an ideal cultivar for Hokkaido region, which is located at midlatitude and has severe winter cold.
3) Perennial ryegrass
Recently, the Hokkaido Pref. Tenpoku Agric. Exp. Station has releasedavariety, ‘Pokoro’, which has moderate winter hardiness and high herbage

production for grazing pasture. Figure 4-21 shows perennial ryegrass attacked
by snow mould fungus, which is a major winter disease in Hokkaido. The newcultivar is resistant to snow mould and thus yields higher than susceptible
ones.
4) Forage legumes
The breeding objectives of forage legume, white clover are winterhardiness and persistency. Red clover is improved for persistency, winterhardiness and compatibility for mix-cultivation with timothy. Breeding of alfalfa
is aimed at improving persistency, yield, resistance to pepper spot andtolerance to trampling by heavy agricultural machinery. These legumes arepollinated by insects, mainly bees.

4-15

N Northern Europe

C Central Europe

E Eastern Europe

W Western Europe

J Japan-14

LT50(oC)

-15

W

-16
C
-17

C
C C
CC N E

J
N

-18
-19

J

N
N

-20

0

1

2

J

W W
W
W

W
W

CC
C

EJ
N

3
4
5
6
Autumn plant vigor

7

Fig. 4-19. Relationship between freezing tolerance (LT50) and plant vigor
in ochard grass populations during autumn (from Nakayama et al. 1997).
-20.0
Freezing tolerance（LT50:oC)

-18.0
-16.0
-14.0

Harunemidori
Hokkai-28-12.0

Wasemidori-10.0

Akimidori

-8.0
-6.0
10.25

11.8

11.22
Date

12.6

Fig. 4-20. Change of LT50 in four cultivars oforchardgrass during autumn

Fig. 4-21. Winter pathogen, snow mould disease inperennial ryegrass. Left two rows: resistant cultivar,
right two rows: susceptible cultivar.

4-16

(2) Corn
All corn cultivars are hybrids. Hybrid is the first generation progeny froma cross involving inbred lines. The objectives of corn breeding in Hokkaido are
improvement in growth at low temperature, yield, lodging resistance andforage quality. Hybrids have been developed from single crosses between highyielding inbreed lines of dent corn and northern flint having good growth at low
temperature (Fig. 4-22).
4.

Utilization of forage crops(1) Grazing management
Grazing

(Fig.

4-23)

management

involves

manipulation

of

the

soil-plant-animal complex to achieve the desired results. Grazing is not common
in Japan including Hokkaido because it is not feasible to produce enough milk
from limited lands. An intensive grazing system has been developed at NARCH
combining short rotational grazing with silage production. Herbage production
differs from season to season; from spring flush to summer slump. Utilization ofsward for short rotational grazing and silage production in time of spring flush isreliable and efficient (Fig. 4-24). Such an intensive grazing system using‘Harusakae’, a new winter-hardy meadow fescue cultivar has been establishedfor eastern Hokkaido under a research project supported by the Ministry ofAgriculture, Forestry and Fisheries (Fig. 4-25).
(2)

Preservation of forage as hay and silage
Forage crops are harvested two or three times in a year, and stored for use

as a consistent, reliable and predictable feed supply system for confinement
feeding to dairy and beef animals. Common forms of storage are hay (usuallywith less 20% moisture) and silage preserved by anaerobic fermentation.
Maturity stage at harvest is considered to be the primary factor affecting forage
quality. Generally, forage quality declines with increase in growth stage of forage
crops. Fig. 4-26 illustrates a typical relationship between quality and maturity
stages based on cell wall components (fibrous constituents) and digestibility.
The general trend is that digestibility declines with increase in maturity, while
fibrous constituents increase. The best harvest time for good forage quality with

4-17

Dent corn

Northern flint
corn

self

self

S6

S6

x

Hybrid corn

Fig. 4-22. Single cross hybrid corn
seed production (Breeding programat NARCH).

Fig. 4-23. Grazing (Photographby N. Sato).

SpringSummer and autumn

Short rotational grazing andharvesting for conserved feed.

Grazing in entire sward andsupplement feed harvested in
Spring（From NARCH)

Fig. 4-24. Intensive grazing system.

Fig. 4-25. Experiment on intensive grazing systemusing meadow fescue in Tokachi district(Photograph by T. Matsumura).

4-18

high herbage production is heading stage. In Hokkaido, relatively earlier harvest
at booting to heading stage has been recommended for cultivation of timothy.
1) Hay harvest
Moisture content in fresh forage crops is often 75 to 85%. Thus a large
amount of water must be removed to produce hay. Weather is one of theimportant factors for drying. First crop-cutting time in Hokkaido is the middle ofJune to early July. Unlike other parts of Japan, Hokkaido normally does not haverains in June-July and thus has relatively low humidity. Therefore, timothy isharvested in June-July to produce high quality of hay.
2) Silage production
Silage is forage preserved by anaerobic storage, usually under conditions
that encourage fermentation for conversion of sugar to organic acids such aslactic, acetic and propionic acids. The lactic acid bacteria are mainly involved infermentation. Silage system is widely used for preserving forage in Hokkaido.
Corn is harvested for whole crop silage. Fig. 4-27 shows corn harvest andmaking of whole crop silage in Tokachi district. Silage production is easier than
hay production because there is no requirement of several good weather daysfor drying. The production of chopped silage has been mechanized; so labor
inputs are lower than for hay. Because of lower mechanical losses in silage
production, harvest losses are lower than in hay production. Wrapped roundbales (Fig. 4-28) and bunker silos (Fig. 4-29) are often seen in Hokkaido.
5.

Status and future prospects
In a couple of past decades in Hokkaido as well as in other parts of Japan,

number of cow and cattle per farm has increased and number of farmers has
decreased. Thus dairy farming and beef production in Japan depend largely on
imported feed (Table 4-2). Some mega-farms (annual production 1,000 t milk perfarm), which use mainly imported feeds have appeared in Hokkaido recently.
Due to this a large number of problems have arisen in animal production
including environmental pollution by animal wastes and serious animal diseases
such as foot and mouse disease and bovine spongiform encephalopathy (BSE).
The self-sufficiency rate of animal feed has been decreasing. The fundamental

4-19

Digestibility

Cell Wall Components

Dry matter (DM)Digestible DM

Vegitative

Fig. 4-26.

BootingHeading

Early Flowering

Late Flowering

Effect of maturity on forage quality in grasses.

Fig. 4-27. Harvest of corn to make whole crop silage in Tokachi district(Photographs by Dr. N. Fujita).

Fig. 4-28. Wrapped round bales forgrass silage (Photograph by
M. Takayama).

Fig. 4-29. Bunker silo for grasssilage covered with polyethylene
and used tires.

4-20

of dairy farming is nutrient cycling based on the involvement of thesoil-plant-animal complex. Most of the nutrients contained in the forages andconsumed by the animals are recycled to soil as urine and dung (Fig. 4-30).
The dependence on concentrated imported feeds has caused too muchaccumulation of nutrients in soil leading to environmental pollution such asvolatilization and nutrients runoff to rivers. During 2007-2008, the price ofimported corn grains for animal feed had drastically increased. This was due toshortage in supply from USA as grains were used for ethanol production. Thus
self-sufficiency in forage production is essential for secure and safe animal
production. This requires developing new forage cultivars with higher
productivity and quality. There is an urgent need to establish an efficient system
for utilization of animal waste. Biogas systems with methane fermentation havebeen installed in some farms of Hokkaido (Fig. 4-31). Methane gas is used forfuel and electricity generation. Establishment of a sustainable grassland-farming
system is essential in Hokkaido.

4-21

Table 4-2. Demand-supply of animal feed in Japan.
(TDN base unit: 1,000 t)
DemandSupply25,529
Roughage

Domestic

4,272

Concentrate

Domestic
materials

1,905

Importedmaterials

4,076

total

5,981

Total
Imported

10,253

Rouhhage

1,269

Concentrate

14,007

Total

15,276

Roughage total

5,541

Concentrate total

19,988Feed self-sufficiency rate

40.2 %Net domestic feed selfsufficiency rate

24.2 %

TDN: total digestible nutritions

Without nutrient inflow fromthe outside system
Light(From MAFF)

Over capacity of nutrient inflow
from the outside system
Light

Grass

Fertilizer

Grass

Concentrate
feed

feed
nutrients
Soil
Soilurine & dungurine & dung
Milk

Volatilizationand nutrients runoff
Environment pollution

Fig. 4-30. Nutrient cycling systems in dairy farm.

Fig. 4-31. Biogas system with methane fermentation.

4-22

Milk