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Animal-Nutrition-pdf.pdf - ANIMAL NUTRITION Prepared by:...

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ANIMAL NUTRITIONPrepared by:LENOR M. TUNAC
Feeding Mechanisms1.Feeding on Particulate Mattera.Filter feedingFeed on drifting microscopicparticles like planktonsmajority of suspension feeders use ciliated surfaces toproduce currents that draw drifting food particles intotheir mouthsentrap particulate food on mucous sheets that conveythe food into the digestive tract.
Feeding MechanismsExamples of filter feederssuspension-feeding invertebratestube-dwelling polychaete worms,bivalve mollusks,hemichordates, andmost protochordatesuse sweeping movements of their setae-fringed legs to createwater currents and entrap food, which is transferred to themouthfairy shrimps, water fleas, and barnacles
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Feeding Mechanisms1. Feeding on Particulate Matterb. Deposit Feedingexploits deposits of disintegrated organic material(detritus) that accumulates on and in the substratum;simply pass the substrate through their bodies,removing from it whatever provides nourishment.many annelids andsome hemichordates, scaphopod molluscsOthers use appendages to gather organic depositssome distance from the body and move them towardthe mouthcertain bivalve molluscs, andsome sedentary and tube-dwelling polychaeteworms,
Feeding Mechanisms2. Feeding on Food MassesPredatorscarnivorous animals simply seize food and swallow itintact,some employ toxins that paralyze or kill prey attime of capture, somehave beaks or toothlike structuresfor biting and holding.Fish, amphibians, reptiles as snakes , birds lackteeth, but their bills are often provided withserrated edges or the upper bill is hooked forseizing and tearing preyInsectshave three pairs of appendages on theirheads that serve variously as jaws, chitinousteeth, chisels, tongues, or sucking tubes.

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