The effect of rumen protected methionine (RPMet) on milk composition of lactating Cashmere Rayeni goat

Authors

1 Department of Basic Sciences, Faculty of Veterinary Medicine, Shahid Bahonar University of Kerman, Kerman, Iran

2 Department of Food Hygiene and Public Health, Faculty of Veterinary Medicine, Shahid Bahonar University of Kerman, Kerman, Iran

3 School of Veterinary Medicine,Shahid Bahonar University of Kerman, Iran

Abstract

BACKGROUND: Methionine has been suggested as the firstlimiting
amino acid for milk production in ruminants. It is important
how to increase milk protein yield and milk fat in dairy ruminants.
OBJECTIVES: This study was set to investigate the effect of rumen
protected methionine (RPMet) on milk composition of lactating
Cashmere Rayeni goats. METHODS: 40 healthy singleton
Cashmere Rayeni goats about 3 to 4 years of age, at the first day of
lactation, were randomly divided into 2 equal control and
experimental groups. The experimental group was supplemented
with 5 gr/day RPMet for 60 days. Milk samples of 2 groups were
taken on 30th and 60th days of the study. Milk protein, milk fat, milk
lactose, and milk Solids-not-Fat (SNF) were determined using
automatic analyzer. The results were statistically evaluated with
SPSS. RESULTS: The supplementation with RPMet did not effect
all of the above mentioned parameters during the 60 days of the
experiment (p>0.05), except for the milk fat percentage of the
experimental group which showed significant increase after 60
days (p<0.05). CONCLUSIONS: Our results about milk protein,
milk lactose, and SNF were in agreement with previous studies that
had not shown significant differences. Results about milk fat on the
30th day were in agreement with the results of several authors who
reported that RPMet did not affect milk fat percentage or yield;
however, in the present study milk fat increased significantly on the
60th day (p<0.05). To the best of the authors' knowledge, no study
about the effects of RPMet on milk composition of Cashmere
Rayeni goat has been done.

Keywords

Iranian Journal of Veterinary Medicine
Volume 8, Issue 4 - Serial Number 4
January 2015
Pages 269-274

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