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Signs of external parasite infestation in livestock include;Damaged skin/wound/abscess on the skinScaly/starring coat/rough coatIrritation/scratchingLoss of hair/feathersAnaemiaPresence of parasites on the bodyEmaciation
Factors that can affect digestibility of a feedstuff in livestock are;Chemical composition of the feed e.g % of lignin or cellulose will influence digestibility.The quantity of feed already present in the digestive system of an animal.The species of the animal eg the digestibility of grass is higher in sheep than in pigs.The ratio of energy to protein will affect digestibility. The higher the ratio the lower the digestibility.
Disadvantages of too much nitrogen in crop production are;Delayed maturityLodging in cerealsExcessive succulency
Proper nutrition Control livestock diseases by;Preventing Nutritional or Metabolic disordersIncreasing resistance of animals to parasites and diseases.