21/11/2019
....Silage preparation is one of the important methods for storage of green fodder for dairy animals & it is necessary to adopt this method by Indian dairy farmers on large scale in situations like drought or scarcity of green fodder availability during summer months (Mar- June).Silage making means preservation of chaffed cereal green fodder in anaerobic condition by way of fermentation method. In anaerobic condition (no air inside pit/tank), with the help of micro- organisms, sugar contained in green fodder is converted in to Lactic acid, which helps to preserve the green fodder for longer duration. Respiratory function of living cells present in green chaffed fodder utilizes the oxygen in air tight condition & releases water & carbon dioxide in closed environment in pit/tank. Due to Carbon dioxide releases in pit/tank, air inside is expelled outside.Further, the aerobic organism which depends on oxygen (Like putrefying bacteria & Fungi) cannot withstand in CO2 atmosphere in Tank/Pit. These effects into preservation of chaffed green fodder in silo pit/tank as silage for longer duration (6 months or maximum a year, if good care is taken while preserving the chaffed fodder and maintaining the silage).Essential fodder crops for silage makingTo prepare best quality silage, cereal green fodder like Green fodder maize, Fodder sorghum, Bajara, Hybrid Napier, Sugar cane tops, Oat, Marwel, etc. are required. The monocotyledons cereal green fodder crops are preferred as they have more sugar content than protein crops (such as berseem, lucern, cowpea, etc.). The sugar present in cereal fodder crops is utilized in fermentation process to produce lactic acid by microorganisms. These cereal fodder crops have hard stem, which takes more time for drying in making hay process. As such, it is better to use these kinds of crops for making silage than hay.Benefits of silage makingSilage is storage system of green fodder which keeps all parts of fodder in appropriate condition for feeding than any other system of storage of fodderSilage requires less space for storage (as it is pressed in pit/tank) compared to hay makingThe daily cutting, transporting & chaffing of fodder in traditional way, requires more labor & time, however, in case of silage, fodder cutting, transport, chaffing is done at one time only. As such, it is less labor & time consuming practice.Land under fodder cultivation is emptied, and immediately it is used for plantation of other crops. So farmers can take more number of crops in same area of land in a year against traditional way, where land is reserved for fodder until all crop is harvestedSilage is prepared in closed & air tight condition so there is no danger of fire. (In hay making, dry fodder is stocked & exposed for fire like situation)Due to lactic acid in silage, it is easily digestible to animals, so energy required for digestion of fodder by animals is used for other purposes like milk production, etc.Silage is tasty & flavored, so it increases appetite of dairy animalsImportant factor to opt for silage is, making green fodder availability in scarcity. Silage provides supply of fodder to dairy animals even during summer months, when green fodder are not available in abundance.Situations like drought, high rainfall & scarcity of fodder (due to any reason), is addressed by using silage for feeding dairy animals. The rain-fed areas, where shortage of green fodder is there from March to June or in high rainy area less fodder availability due to water logging, silage serves as an important feeding tool.Just by treating silage with food additives (like; energy, mineral & vitamins, etc.), farmers can enrich the silage for dairy animals.Methods for silage making:There are four methods for silage making: (1) Tank or Silo (2) Pit (3) hill side pit (4) silage buns (stacks). Of these 4 methods only two are generally used i.e. Tank (silo- above the ground) method or Pit (below the ground) method. These two methods are economically viable for dairy farmers. For planning of silage requirement, following aspects needs to be kept in mind:How many dairy animals farmer has?How many days farmer need to feed his animals with silage?Is there sufficient green fodder available with farmer to prepare required quantity of silage?Example: - suppose a dairy farmer has 4 adult milch animals and he need to feed his animals with silage for four summer months (i.e. March to June)! Please see the following points:The silage is to be made for 4 adult milch dairy animals for 4 summer months (Mar to Jun) i.e. for 120 days Maximum per day feeing requirement of silage is 20 kg per animal. Per day need of silage for four animals would be 80 kgSo for four months i.e. 120 days for four animals requirement of silage would be 9600 kgThis means 9600 kg of chaffed green fodder is require to make silage for four dairy animals for four monthsOne cubic foot- in pit or tank (1 cubic foot = 1 foot long × 1 foot wide × 1 foot high), contains 16 kg of chaffed green fodderTo decide dimension of pit/tank for 9600 kg chaffed green fodder, divide 9600 kg by 16 kgMeans the farmer may have to make 600 cubic feet of pit/tank – in dimension of 20 foot long × 6 foot wide × 5 foot high.Pit/tank method for silage making:Depending upon local situation like; ground water level, number of animals & duration of feeding silage to animals, the shape & size of constructing silage pit or tank is decided. Look at following steps:select location for making pit at higher level on ground so that rain water should not percolate into the pit.In rectangular pit, corner edges should be made round, so that while filling & pressing chaffed fodder, air will not be trapped inside the corners of pit or tankWall of pit/tank should be air proof to avoid air to get into the pit/tank through cracks. To avoid this situation, the silo pit or tank walls should be plastered with cement or moistened soil. If ground water table is high (water comes out with digging of few feet of soil), then go for building tank (silo) and avoid pit method. If plastering cement to the wall of pit/tank is uneconomical, then farmers can use HDPE plastic paper (200 micron) to cover pit/tank inside out position.Picture 3: stage-wise finishing with proper coveringTreatment for Silage:For making best quality & balanced silage, it needs proper treatment of additives described below:-Per ton of chaffed green fodder requires 1 kg Urea, 2 kg jaggary, 1 kg common salt, 1 kg mineral mixture & 1 liter of whey (to activate the fermentation process).Prepare separate solution in 15 to 20 liters of water for Urea, Jaggary, Mineral mixture & common salt in separate pots/buckets & then spread it on layer by layer of chaffed & pressed green fodder, while filling silo pit/tank.Procedure for filling silo pit/tank:When fodder crop is in cob stage or tussling stage (milky stage), it is best time to harvest it for preparation of silage. Mature stage of fodder crop is not good for preparing silage as its sugar content is decreased as well as the fiber percentage increased; this kind of fodder is less suitable for silage making.After harvesting fodder crops, let it get dry for 5-6 hours in shed so that moisture content of fodder will decreases from 80% to 65-70%. Care to be taken to avoid silage making in rainy days or crops containing dew drops in winter season because moisture is more in this situation so there may be chances for development of mold in silo pit during storage period.Following steps to be taken while filling silo pit/tank:Prior to filling silo pit / tank, clean it & dry it.Cover with plastic film inside pit/tank in such a way that it will cover all sides of pit/tank.For making silage, chaffing of fodder is essential. With the help of chaff cutter machine, make pieces of 1.5 cm to 2 cm length of green fodder crop (fodder maize, sorghum, sugarcane tops, Marwel, Fodder bajara, etc.) before filling it to silo pit.Prepare separate solution in 15 to 20 liters of water for Urea, Jaggary, Mineral mixture & common salt in separate pots/buckets & then spread it on layer of pressed chaffed green fodder while filling silo pit/tank.Start to fill chaffed green fodder in silo pit or tank.After making 4” thick layer of chaffed green fodder, press it with wooden plank(Like Mortar) in such a way that air will not entangled in chaffed fodder. Then sprinkle it with prepared solution of Jaggary, Mineral mixture, Urea, Common salt & whey.Follow the same procedure until filling of pit/tank 1 to 1.5 feet above the ground level (Inside pit).Then covet it from plastic film from all side carefully.Covet it with Trash, Wheat straw, Soil & dry hay to protect it from entering rain water in to it. If possible, temporary arrangement of thatched or any shed above the silo pit/tank should be done.It will require 45 to 60 days to make good quality of silage.Use of silage:After 8-10 weeks, silage is ready as feed for animals. Open pit/tank initially from one side of for use. Keep the area covered where from the silage is not in use. Then cover the pit very carefully by with plastic film by pressing, so that air will not go inside in the silage. Initially fed animals with 5-6 kg silage by adding it with chaffed green fodder to develop taste. Once animal likes sweet-sour taste of silage; they will eat it with good palatability.Quality of Silage:Mold : Good quality silage is free from Mold (If silage while filling pit/tank, not well pressed there could be chances of growth of mold (silage with mold is not considered to be a good quality).Odor : Good quality silage has sweet & sour taste.Color : Good quality silage has faint green or brownish color. Rotten silage has black color.pH : Very Good quality silage has pH of 3.5 to