Methionine is a sulphur-containing essential amino acid which is frequently deficient in animal diets. A number of reports have indicated positive responses to the addition of methionine to the diet of ruminants in the form of protein or the individual amino acid. Protection against degradation by rumen microorganisms is necessary in addition to availability for absorption in the small intestine.

The two major genotypes of fine fibre-producing goats are the Angora breed which produce predominantly mohair and those which produce cashmere from secondary hair follicles. Fibre production by primary follicles in Angora goats is limited whereas ‘guard hair’ production in cashmere producers is generally susbtantial.

The object of the present study was to compare the response of the two genotypes to the incorporation of a ruminally protected intestinally available methionine supplement in the diet.