the effect of rumen protected methionine (rpmet) on milk composition of lactating cashmere rayeni goat

background: methionine has been suggested as the firstlimitingamino acid for milk production in ruminants. it is importanthow to increase milk protein yield and milk fat in dairy ruminants.objectives: this study was set to investigate the effect of rumenprotected methionine (rpmet) on milk composition of lactatingcashmere rayeni goats. methods: 40 healthy singletoncashmere rayeni goats about 3 to 4 years of age, at the first day oflactation, were randomly divided into 2 equal control andexperimental groups. the experimental group was supplementedwith 5 gr/day rpmet for 60 days. milk samples of 2 groups weretaken on 30th and 60th days of the study. milk protein, milk fat, milklactose, and milk solids-not-fat (snf) were determined usingautomatic analyzer. the results were statistically evaluated withspss. results: the supplementation with rpmet did not effectall of the above mentioned parameters during the 60 days of theexperiment (p>0.05), except for the milk fat percentage of theexperimental group which showed significant increase after 60days (p