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EXTENSION ARTICLE Pakistan Vet. J., 2006, 26(3): 144-148.
144
NEW DIMENSION OF MEDICINAL PLANTS AS ANIMAL FEED
M. A. TIPU, M. S. AKHTAR, M. I. ANJUM1 AND M. L. RAJA
Buffalo Research Institute, Pattoki (Kasur) and 1Animal Nutrition Programme,
Animal Sciences Institute, National Agricultural Research Centre, Islamabad, Pakistan
ABSTRACT
The medicinal plants and herbs have been used for many years in the treatment of various diseases in
animals and human beings. Now-a-days, utilization of these medicinal plants is increasing. These are used
in animal feed as the growth promoters. Due to prohibition of most of the antimicrobial growth promoters
in animal feed because of their residual effects, plant extracts are becoming more popular. They act as
antibacterial, antioxidant, anticarcinogenic, antifungal, analgesic, insecticidal, anticoccidial and growth
promoters. These plant extracts compete with the synthetic drugs. Majority of medicinal plants do not have
the residual effects. Azadiracht indica, Zizyphus vulgaris, Ocimum gratissimum and Atlanta monophylla
have the strong antibacterial activity, whereas ocimum plant has strong antioxidant, anticarcinogenic,
antifungal, analgesic and antipyretic properties. Leaves of Azadirachta indica are used for feeding and
reducing the parasitic load of animals. The fruit of Azadirachta indica also has the anticoccidial activity for
poultry.
Key words: Medicinal plants, animals, antibacterial, growth promoters.
INTRODUCTION
Plants are the oldest friends of mankind. They not
only provide food and shelter but also serve humanity by
preventing and curing different ailments. Herbs and
spices have always been helpful to cure diseases. In
modern animal feeding, they are forgotten because of use
of antimicrobial growth promoters (AGP). But due to the
prohibition of most of AGP, plant extracts have gained
interest in animal feed strategies (Charis, 2000). The risk
of the presence of antibiotic residues in milk and meat
and their harmful effects on human health have led to
their prohibition for use in animal feed in the European
Union (Cardozo et al., 2004). Many plants also produce
secondary metabolites such as phenolic compounds,
essential oils and sarasaponins (Chesson et al., 1982;
Wallace et al., 1994; Kamel, 2001)
The practice of herbal medicine dates back to the
very earliest period of known human history. There is
evidence of herbs having been used in the treatment of
diseases and for revivitalising body system in almost all
ancient civilizations, the Egyptian, the Chinese and
even Greek and Roman civilizations (Aftab and Sial,
1999). Kar et al. (2004) have reported that several plant
products are claimed and proved to possess analgesic
and antipyretic properties. Majority of herbal plants are
safe and economical. Generally, plant extracts have no
problem of drug resistance.
Herbs normally used are picorhiza, garlic, cloves,
slippery elm, neem fruit and leaves, sophora flavescens,
nutmeg, cinnamon, ginger, peppermint, sage, thyme,
mustard and fenugreek. These plants are used as
digestive stimulants, antidiarrhoic, antiseptic, anti-
inflammatory, antiparasitic and appetite stimulants in
human beings as well as animals (Table 1).
Antimicrobial activity
Earlier studies indicate that many plant extracts
have antimicrobial activity. According to Almas (1999),
the extracts of Azadirachta indica (neem plant)
chewing sticks are effective against Streptococcus
mutans and Streptococcus faecalis. Chewing sticks are
recommended as oral hygiene tools for health
promotion in developing countries.
Hayat et al. (2004) studied the in vitro
antimicrobial activity of Zizyphus vulgaris root extract
against both gram positive and gram negative
organisms using Staphylococcus aureus and
Escherichia coli, respectively. Three different concen-
trations of the ethanolic extract of the roots were used
and the activity compared with the standard antibiotics.
All the concentrations showed excellent inhibitory
effect on the growth of gram positive and gram
negative microorganisms. It is evident, however, that in
practice most individual herb or spice extracts must be
included at a high concentration to observe effects
comparable to those of antibiotics. This is only logical
as many extracts contain a multitude of active
substances. The Origanum vulgare is described as
containing more than 30 antibacterial chemicals.
Akilandeswari et al. (2003) tested aqueous neem
extract prepared from the Azadirachta indica bark
against the strain of bacteria Proteus vulgaris and fungi
Candida albicans, to examine its efficacy as an
antimicrobial agent. The growth inhibitory property of
the aqueous extract was recorded in terms of zones of
inhibition measured in 24 hours growth cultures using
disc plate technique. The growth of Proteus vulgaris
and Candida albicans was inhibited remarkably due to
aqueous neem bark extract. Out of these two organisms
tested in the experiment, the bacteria Proteus vulgaris
Pakistan Vet. J., 2006, 26(3): 144-148.
145
showed more susceptibility to neem bark extracts in
comparison with fungi Candida albicans.
Antioxidant properties
Oxygen is one of the most important element for
life, growth and metabolism of living organisms. Auto-
oxidation process results in the destruction of important
molecules in diet formulations and also damages
cellular tissues in living organisms. Therefore, auto-
oxidation results in the formation of reactive oxygent
species and causes different kinds of diseases.
Flavonoids and phenoic acids are widely present in
Table 1: Herbal Plant extracts and their multiple medicinal properties
English
name Botanical
name Useful
part Active substance Medicinal properties
A) Aromatic Species
Nutmeg Myristica
fragrans Seed Sabinene Digestion stimulant, antidiarrhoic
Cinnamon Cinnamomum
zeylanicum Bark Ammameldehyde Appetite and digestion stimulant,
antiseptic
Clove Syzygium
aromaticum Cloves Eugenol Appetite and digestion stimulant,
antiseptic
Caradamon Elettaria
caramomum Seed Cinook Appetite and digestion stimulant
Coriander Coriandum
sativum L. Leaves Unalol Digestion stimulant
Cumin Cuminum
cyminum Seed Cuminaldehyde
Digestive, galactagauge
Anise Illicum verum Fruit Anethole Digestion stimulant, galactagauge
Celery Apium graveolens Fruit,
leaves Phtalides Appetite and digestion stimulant
Parsley Pelroselinum
crispum Leaves Apiol Appetite and digestion stimulant,
Antiseptic
Fenugreek Trigonella
foenum-graecum Seed Trigonelline Appetite stimulant
B) Pungent species
Capsicum Capsicum annum
longum Fruit Capsaicin Antidiarrhoic, anti-inflammatory,
stimulant tonic
Pepper Piper nigrum Fruit Piperine Digestion stimulant
Horseradish Cochlearia
armoracia Root Allyl
isothiocyanate Appetite stimulant
Mustard Brassica spp. Seed Allyl
isothiocyanate Digestion stimulant
Ginger Zingiber
officinale Rhizom Zingerole Gastric stimulant
C) Aromatic herbs and spices
Garlic Allium tuberosum Bulb Allicin Digestion stimulant, antiseptic
Rosemary Aniba rosaeodora Leaves Cineole Digestion stimulant, antiseptic,
antioxidant
Thyme Thymus vulgaris Whole
plant Thymol Digestion stimulant, antiseptic,
antioxidant
Sage Salvia apiana Leaves Cineole Digestion stimulant, antiseptic,
carminative
Bay laurel Laurus nobilis Leaves Cineole Appetite and digestion stimulant,
antiseptic
Peppermint Mentha piperita Leaves Menthol Appetite and digestion stimulant,
antiseptic
Artemisia Artemisia annua Leaves Artemisin Anticoccidial
Neem Azadirachta
indica Leaves,
Bark, seed Azadirachtin,
salanin,numbin,
meliantrial
Antiviral, antiseptic, fungicidal
Source: Charis (2000)
Pakistan Vet. J., 2006, 26(3): 144-148.
146
higher plants. These compounds are effective against
the deleterious effect of reactive oxygent species.
According to Middleton and Kandaswami (1993), some
compounds found in Ocimum plant have been reported
to possess strong antioxidant activity. Cinnamon has
antioxidant characteristics (Middleton and
Kandaswami, 1993). Cinnamon extracts show
antioxidant activity which is comparable to synthetic
antioxidants, beta hydroxy toulene.
Anticarcinogenic activity
It is reported that leaves of Ocimum tenuiflorum
possess anticancerous properties. Samresh et al. (2003)
found that Ocimum suppressed benzo pyrine induced
chromosomal aberrations in bone marrow and elevated
glutathione (GSH) and glutathione-S-transferase (GST)
activities in liver of mice. They also reported a
suppressing effect of the plant on chemically induced
hepatomas in rats and tumors in the fore-stomach of
mice.
Studies in mouse have also indicated the presence
of flavonoids in Ocimum leaf extract. Flavonoid-
enriched diet has a preventive effect on cancer,
coronary heart disease and strokes. Thus, Ocimum can
play a definite role in developing a cancer preventive
drug.
Analgesic and antipyretic activities
Godhwani and Godhwani (1987) conducted studies
by using methanol extract and aqueous suspension of
leaves of Ocimum tenuiflorum on albino rats. The
methanol extract (in doses of 100, 250 and 500 mg/kg)
showed analgesic activity in mice as evaluated by the
mean time taken to withdraw tail when brought in
contact with the hot plate. Methanol extract had more
analgesic activity than the aqueous suspension. The
analgesic activity was attributed to amino acids
resembling creatine and isoleucine, which have been
reported to be analgesic.
Insecticidal properties
Some herbs, especially neem, have strong
insecticidal activity. The Meliaceae, especially
Azadirachta indica (Indian neem tree) contains at least
35 biologically active principles (Mulla, 1999).
Azadirachtin is the predominant insecticidal active
ingredient in the seed, leaves and other parts of the
neem tree. Azadirachtin and other compounds in neem
products exhibit various modes of action against insects
such as antifeedancy, growth regulation, fecundity
suppression and sterilization, oviposition repellency or
attractancy, changes in biological fitness and blocking
fitness, and blocking development of vector-borne
pathogens. Some of these bioactivity parameters of new
products have been investigated at least in some species
of insects of medical and veterinary importance, such as
mosquitoes, flies, triatomines, cockroaches, fleas, bees
and others. Neem works as a repellent by disrupting the
appetite of insects and diminishing their urge to
reproduce.
The greatest advantage to pest control with neem is
the fact that it does not harm useful insects such as
ladybirds, wasps and earwigs. Additionally, neem is
benign to spiders and plant pollinators such as bees and
wasps. Unlike most chemical pesticides that contain
poisonous groups of nitrogen, chlorine, phosphorus and
sulpher in their molecules, and are potentially
hazardous, neem has been found to have little or no
mammalian toxicity. Furthermore, in all scientific trials
conducted to date, neem deters insects as effectively
and economically as DDT and other synthetic
pesticides
Anticoccidial activity
The herbs especially Azadirahta indica, Hobrrhena
antidysentrica, Barberis aristata, Embelia ribes, Acorus
calamus and Artemisia annua have strong anticocidial
activity. Zycox, a herbal product of India containing
Hobrhena antidyseatria, Barberis aristata, Embelia
ribes and Acorus calamus, is used as a prophylactic
measure against coccidiosis. Guha et al. (1991)
observed that Zycox treated birds showed 3% mortality
as compared to infected group. According to Singh et
al. (1991), Zycox at 0.3% in feed offers a convenient,
effective and economical indigenous alternative for
prophylactic medication against coccidial infection in
chicken. It causes least interference to the natural
development of immunity and is safe and not likely to
induce resistance.
Tipu et al. (2002) compared the anticoccidial
efficacy of salinomycin sodium and neem fruit in
boilers. They concluded that the addition of 0.3%
ground neem fruit in boiler feed has tremendous
efficiency in combating coccidiosis as compared to
salinomycin sodium (Table 2). They reported that neem
fruit had compound margosate, responsible for the
break down of Eimeria life cycle.
Similarly, Allen et al. (1997) investigated the effect
of feeding dried Artemesia annua leaves and its
Table 2: Oocyst count/gram of faeces and mortality in
broilers treated with different preparations
Groups Treatments Mortality
(%) Total
oocyst
count
A Infected + Kokcisan 2.63 4350
B Infected + neem
(0.01%) 2.63 2900
C Infected + neem
(0.02%) 2.70 1500
D Infected + neem
(0.03%) 0.00 1250
E Infected + non
medicated control 12.82 20050
F Infected + medicated
control 0.00 0
Source: Tipu et al. (2002)
Pakistan Vet. J., 2006, 26(3): 144-148.
147
components to birds infected with Eimeria acervulina,
E. tennela or E. maxima. When fed at a dose rate of 1%
for 5 weeks prior to infection, significant protection
was noted for both E. tenella and E. acervulina.
Artemesia contains artemisinin which protected weight
gains and reduced oocyst yields for both E. tenella and
E. acervulina. According to Youn-Hee Jeong et al.
(2001), the sophora flavescens extract was the most
effective for survival rates, controlling bloody diarrhoea
symptoms, lesion scores, body weight gains and oocyst
excretion in the faeces
Weight gain and feed consumption
Previous literature shows that use of herbs in
animal feed improved the weight gain of animals.
These can be used simultaneously for treating parasitic
diseases as well as increasing the weight gain and act as
growth promoters.
Kudke et al. (1999) fed calves on green fodder
supplemented with or without powdered neem leaves
(0, 5 or 10 gm daily) for 12 weeks. Faecal samples were
examined fortnightly for coccidia, cestodes and
nematodes. Significant differences in growth rate were
observed between the treated and control groups. Daily
rate of growth was 0.268, 0.346 and 0.400 Kg for
groups treating with 0, 5 and 10 gm neem leaves daily,
while daily dry matter intake was 2.09, 2.14 and 2.21
kg, respectively. Inclusion of neem leaves powder
resulted in an increase in total feed intake by 5.7%. The
control group was more prone to parasite infections
compared with neem treated groups. Neem works as a
growth promoter by killing parasites that hinder the
growth of animal.
The mature tree of Azadirachta indica (Neem)
plant can produce 350 kg of leaves a year, which may
be used for feeding cattle during famines. After the oil
has been pressed out from the seeds of neem, the cake
is used as fertilizer but it can also be used as feed.
Kudke et al. (1999) concluded that upto 10% neem
cake may be included in concentrates for cattle and
upto 5% for poultry. Chemical composition and
digestibility of neem is shown in Table 3.
Hayat et al. (1996) studied comparative
prophylactic effects of indigenous preparations of bakin
(Melia azadarach) and kerala (Momordica charntia) in
comparison with the salinomycin against coccidiosis in
broiler chicks. Ninety day-old chicks were divided into
five groups (salinomycin, bakin, kerala, infected
untreated and uninfected untreated), each comprising of
18 birds. The chicks were inoculated with mixed
species of coccidia at the age of one month. The results
revealed higher (P<0.05) weight gain in the birds using
salinomycin and those of uninfected untreated groups.
Addition of salinomycin, bakin and kerala in the ration
markedly reduced the number of oocysts per gram of
faeces from 50,000 to 1730, 3323 and 3669,
respectively.
Mandal et al. (1992) studied the anticoccidial
efficacy of Zycox at three different dose levels (0.3,
0.45 and 0.6%) in feed against Eimeria necatrix
infection in broiler chicks. The performance index
clearly depicted its efficacy at these dose levels. The
efficacy was found to be higher in higher dose levels.
The effect of medication on the development of
immunity was also evaluated. The calculated immunity
index coupled with survival (%), mean weight gain (%)
and lesion score protection (%) conferred sufficient
justification to conclude that the product had no
interference with the development of immunity. The
results showed that Zycox was effective against E.
necatrix at all 3 dose levels.
Conclusion
Medicinal plants compete with the synthetic drugs.
As the world is becoming more advanced, new diseases
are emerging in animals and human beings by irrational
use of antibiotics and antimicrobial growth promoters.
Now it is the need of the hour to work more extensively
on the medicinal plants in the greater interest of
mankind
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Neem leaves (Pak) 35.8 13.4 14.7 10.3 6.2 55.5 1.94 0.17
Neem cake (India) 43.1 17.1 28.2 15.4 2.3 37.3 1.38 0.12
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