REPLACEMENT OR ALTERNATE OPTION FOR MAIZE WITH OTHER ENERGY SOURCES IN POULTRY FEED

Introduction

Poultry production in India during the last decades has taken a shape of industry. However, in recent years poultry production has crippled many times due to rising feed cost and diseases. Feed accounts for more than twothird of production cost. Traditionally maize is used as an energy source in poultry feeds. Total requirement of maize would be around 112 million tonnes in 2025 with allocation of 28 million tonnes for poultry (45% of poultry diet; Mandal, 2009). Thus, major challenge is the shortage of feedstuffs. It is, therefore, essential to identify alternate energy feedstuffs for economic poultry production. Bajra or Wheat can be an alternate to maize, however, the utilization efficiency of wheat is lower than that of corn because it contains more anti-nutritive factors, especially non-starch polysaccharides (NSP).

Cereal grains are used mainly to satisfy the energy requirement of poultry. The dominant feed grain is corn, although different grains are used in various countries and regions of the world. For instance, in the US, Brazil and most Asian countries corn is by far the most important energy source for all poultry feed, whereas wheat is the predominant supplier of dietary energy for poultry diets in Europe, Canada, Australia, New Zealand and the Russian Federation. Of course, in reality, a feed manufacturer will use any grain in a poultry diet if it is available at a reasonable price. For instance, in some parts of the US and China wheat is often used in place of corn if its price is below that of corn. In Australia, sorghum is a key grain during the summer season instead of wheat, while in the Scandinavian countries barley and rye are used when these grains are at the right price. Although the amounts and types of cereal grains included in poultry diets will depend largely on their current costs relative to their nutritive values, care must be taken to avoid making large changes to the cereal component of diets as sudden changes can cause digestive upsets that may reduce productivity and predispose the birds to disease.

WHY THERE IS NEED OF REPLACEMENT OF MAIZE WITH OTHER ENERGY SOURCE-–

The growing world food crisis has presented a challenge to poultry nutritionists, especially in India, to investigate the possibilities of utilizing other potential energy feed sources as a replacement for maize grain. The major portion of the crop is now diverted for purposes such as biofuel, brewery and starch industries, apart from its growing spate in human consumption. Maize of course, is the major feed ingredient in broiler diet with the inclusion level of around 60% in the total diet. In India, because of only a marginal increase in maize production coupled with poor production per hectare, has widened the supply and demand gap which has put lot of pressure on maize price during most of the year. Because of this, it has become quite essential to identify and evaluate less expensive, readily and locally available energy sources for poultry feeding in the place of maize.

Energy Sources——

Common Energy Sources

The cereals and cereal by-products are mainly energy sources and can constitute about 50-60% of the poultry diet. Some of the conventional cereals and cereal by-

products are described below:—

i) Maize

Maize is also known as corn and is the most common cereal used in poultry diet due to its low fibre content (about 2%), high fat content (3-6%) and having high palatability (acceptability to taste). Yellow maize is preferred over its white variety as the yellow maize is rich in pigments (carotene-precursor of vitamin A and xanthophylls) responsible for deep yellow colouration of egg yolk and broiler skin. It contains 9-10% crude protein (CP) and 3300-3450 kcal ME/kg of energy. It can be fed up to 60% in poultry diet. While purchasing maize, you should take care of its moisture content, which should not be more than 11 to 12 %. In immature maize, chances of aflatoxin or fungal growth will be more.

ii) Rice

Only broken rice (rice kani) or rejected lots which are unfit for human consumption are generally used as a common cereal for poultry feeding. The rice contains 7-8% protein and 2800-3000 kcal ME/kg of energy and can be included up to 10% in broiler diet and 20% in layer diet.

iii) Rice bran or Rice polish

Most important by-products obtained during milling of paddy for rice are rice bran

and rice polish . Practically, it is difficult to distinguish between bran and

polish. The good quality rice bran contains 11-12% protein and 1800-2000 kcal/kg

energy, while deoiled rice bran contains 12-16% protein and 1600-1800 kcal/kg

energy. A good quality of rice polish contains 12-14% protein and 2600-2800 kcal/

kg energy.

iV) Wheat

One of the common cereals is wheat and it contains 11-14% protein with 2900-

3100 kcal/kg ME. The wheat is more digestible and a better source of amino acids, minerals and vitamin B group. Due to its maximum use as a human food, good quality wheat is not available for poultry feeding. However, if you get desired amount of wheat you can safely replace 50% of maize by wheat.

v) Wheat bran

It is the outer covering of wheat kernel and contains 14-15% protein and 1000-

1400 kcal/kg energy . It is an excellent source of amino acids, minerals and vitamins.

vi) Fats and Oils

Fats and oils are rich source of energy (7000-9000 kcal/kg). The oils are digested more readily than saturated fats like tallow. These provide energy, improve palatability, reduce dustiness etc. It can be used up to 5 % in broiler diets. Coconut oil, groundnut oil, linseed oil and soybean oil are commonly used in poultry rations.

Unconventional Energy Sources ——–

In order to avoid dependency on some conventional ingredients because of nonavailability, high cost etc., the nutritionists were always compelled to search for locally available alternate feedstuffs. Though, it is difficult to differentiate between conventional and unconventional feedstuffs, as some may be used in a particular area of the country due to its availability in large quantity, but may not be used widely in other areas and termed as unconventional or alternate ingredients. Some of the unconventional energy feedstuffs are described below:

i)Bajra

Bajra is also called Pearl Millet and contains 12-14 % protein and 2800-

2900 kcal/kg energy with its inclusion level @ 30% replacing 50% maize in diet of

broilers or layers.

ii)

The barley is less palatable due to more crude fibre (6-7%). It is provides less energy (2700-2900 kcal ME/kg) when compared to maize. The protein content in barley is 9-10%. An anti-nutritional factor known as a-D-glucans present in barley results in sticky droppings in broilers and layers. Soaking in water and enzyme (a glucanase) supplementation can enhance its nutritive value. Chicks are sensitive to barley; however it can be used at the rate of 20% in layer diet.

iii) Cassava or Tapioca meal

A meal obtained from the roots of cassava plant is rich in energy content (2700-2900 kcal ME/kg), crude fibre (9-10%) but poor in crude protein (2-4%). Presence of cyanogenic glucosides in this meal restricts its use.

iv) Jowar or Sorghum

Jowar or Sorghum is comparable with maize in terms of protein (9-11%) and energy (2800-3000 kcal/kg) and it can replace maize up to 70%, but its tannin content (above 0.5% level) may limit its safe inclusion. White variety (low tannin) is preferred over dark or brown coloured (high tannin) variety.

v) Molasses

A liquid obtained from sugar milling industry is the cheapest source of energy (1800-

2200 kcal ME/kg) and is rich in minerals. It can be used to replace cereal grains up to 5% of the ration . Cane molasses is usually higher in sugar content than that from beet. It is a binding agent and you can use 2-3% in the manufacturing of pelleted feed.

vi) Salseed meal

Salseed meal is a forest-origin feedstuff and contains 9-10% protein and 2300-2800 kcal ME/kg energy. Because of its high tannin content (12-13%), you cannot use it in poultry rations in higher quantity. However, a very low level of salseed meal up to 3% can be used in the diet of poultry in raw form.

Table 1. ME value and key nutrient composition of cereal grains

Ingredient Protein

(%) ME

(kcal/kg) Calcium

(%) Available P

(%) Lysine (%)

Wheat 13.0 3153 0.05 0.20 0.5

Corn 8.5 3300 0.05 0.20 0.3

Sorghum 9.0 3263 0.02 0.15 0.3

Barley 11.5 2795 0.10 0.20 0.4

Rye 12.5 2734 0.05 0.18 0.5

Triticale 15.4 3110 0.05 0.19 0.4

Oats 12.0 2756 0.10 0.20 0.4

The quality of cereal grains will also depend on seasonal and storage conditions. Poor growing or storage conditions can lead to grains with a lower than expected energy content or contamination with mycotoxins or toxin-producing organisms such as fungi and ergots. Genetic and environmental factors also affect not only the content of nutrients in grains but also the nutritive value, which takes into account the digestibility of nutrients contained in an ingredient in the target animal.

In addition to the cereals themselves, their by-products, such as wheat bran, rice bran and DDGS, are used widely in poultry feed. Cereal by-products are typically high in fibre, or non-starch polysaccharides (NSP), which are poorly utilised in poultry and are low in ME.

BAJRA——————–

One of the energy sources available for replacing maize in poultry ration is Bajra (Pearl millet). Pearl millet one of the most drought-tolerant of all domesticated cereals, is grown widely in tropical regions of Africa and Asia. India is the largest pearl millet producer in the world. It can be grown under seasonal rainfall as low as 200-250 mm, making it only reliable productive cereal in driest rain fed regions of the arid and semi-arid tropics. The important dry land crop provides both grain as well as fodder. Bajra grain contain 12 % C.P. and 3240 kcal M.E. and resembles maize ( 9% CP and 3330 kcal ME) in most of the qualities. It can be included upto 30% in chick ration and upto 60% in grower and layer ration. Thus, Bajra may provide major replacement of maize in poultry feed because of the striking similarities in nutrient composition of these two types of grains.

Bajra crop is well adapted to production systems characterized by low rainfall, low soil fertility and high temperature, thus can be grown in areas where other cereal crops like wheat or maize would not survive. Bajra protein offers the added advantage of having more lysine, methionine and tryptophan content than other food grains. Comparatively, it has also the lower fat producing ability within the animal system. The grain also supplies more thiamin and iron.

Lower productivity——————–

The productivity of the crops like Bajra is much lower due to various reasons such as non-availability of quality inputs to the farmers, lack of access to improved varieties of seed and other technologies, unavailability of credit on time, poor storage facilities and poor market linkage etc. There is no doubt, a large potential for using pearl millet as alternate to maize in poultry feed. It is important to propagate the good nutritive as well as other attributes of pearl millet among poultry producers and feed manufacturers to promote this as an alternate to maize.

It has been reported that the Pearl millet based diet provides best (p<0.05) feed conversion ratio (FCR) and the lowest (p<0.05) feed cost per unit of body weight gain. Complete replacement of maize with pearl millet in broiler diet did not impair feed intake, body weight gain and feed conversion ratio and nutrient retention.

Inclusion in poultry diets——————–

Pearl millet has been shown to be a suitable feed ingredient for poultry diets, and whole seeds can be fed to poultry. Its seed is higher in methionine than maize, alleviating some of the need for synthetic methionine supplementation in organic poultry diets. Feeding ground pearl millet to laying hens results eggs higher in omega-3-fatty acids and lower in omega-6-fatty acid than eggs from hens receiving a corn based diets.

Although pearl millet can be grown in areas not favorable to corn, and the grain can be used in poultry diets, but the production of pearl millet has been limited due to its susceptibility to rust disease. Rust resistant hybrid of pearl millet has been developed so as to alleviate this concern. Thus, the grain in poultry feeds is a good alternative to maize for broilers and layers. When pearl millet replaced maize part per par isocalorically and isoproteinically, the performance of chicks was either comparable or even better than those on of maize based diet. Pearl millet was included at 60% part per part or isocalorically and isoproteinically at the expense of maize, the performance of layers was comparable. The protein content of pearl millet, although variable, but higher and essential amino acid profile is more balanced than corn. It has higher oil content than other common cereal grains and is a better source of linolenic acid. Based on the performance of broilers and laying hens fed pearl millet, it appears that pearl millet is equivalent or sometimes even superior to corn as a grain source for poultry rations. Moreover, the crop matures quickly, which it make potentially an ideal component of traditional double cropping and rotational cropping system.

Anti-nutritional Factors——————————–

Pearl millet grain does not have many of the anti-nutritional factors than other alternative grains do. As compared with Rye and Sorghum, pearl millet is low in tannins. It does not appear to need to be heat treated to destroy any protease inhibitor or other harmful factors. However, the grain contains saponins, which are known to damage the lining of the digestive tract. The pearl millet grown in the United states appears to be resistant to aspergillus flavus infection, reducing concern about mycotoxins. However, the grain is susceptible to fusarium fungi, but the level of fusarium toxins is usually low.

Multiple uses——————

Bajra is also used as fodder for livestock. The crop is cultivated in India approximate on 900000 hectares yielding 20-35 tonne of green fodder per hectare. It is generally grown for taking the grains not as fodder. After removing grains, its stalks are seldom used for feeding the animals as fodder crop in the country. Whenever it is grown as a fodder crop, it is harvested before flowering stage for feeding the animals. It is a quick growing, disease resistant, high tillering fodder crop, suitable for sowing in arid and semi-arid regions which can be sown early in spring under irrigated conditions and in kharif under rainfed condition. However, it is not suitable under high rainfall areas. It does well even on light soils. It is sown alone or mixture with guar or cow pea. The crop is cultivated in a similar manner as jowar and maize; and contains 22% dry matter, 13% TDN and 0.9% DCP. Hybrid-Bajra-1 has been developed by GADVASU scientist in Ludhiana, which is disease resistant and can be grown in all types of soil and climate condition.

Harvesting and Yield———————-

The first cutting should be done after 50-80 days, after sowing and subsequent cutting after 35-40 days. For good regrowth, the cutting height should be 15 cm from the ground. The yield depends upon the varieties, but the average green yield may be 400-600 q/hectare.

Reference-On Request