University of Tehran Iranian Journal of Veterinary Medicine 2251-8894 8 4 2015 01 01 The effect of rumen protected methionine (RPMet) on milk composition of lactating Cashmere Rayeni goat بررسی تاثیرمتیونین خوراکی پوشش دار بر ترکیبات شیر بز کرکی رایینی 269 274 52486 10.22059/ijvm.2015.52486 EN Mohamad Naser Nazem Department of Basic Sciences, Faculty of Veterinary Medicine, Shahid Bahonar University of Kerman, Kerman, Iran Masood Sami Department of Food Hygiene and Public Health, Faculty of Veterinary Medicine, Shahid Bahonar University of Kerman, Kerman, Iran Nasrin Askari School of Veterinary Medicine,Shahid Bahonar University of Kerman, Iran Journal Article 2014 05 08 BACKGROUND: Methionine has been suggested as the firstlimiting<br />amino acid for milk production in ruminants. It is important<br />how to increase milk protein yield and milk fat in dairy ruminants.<br />OBJECTIVES: This study was set to investigate the effect of rumen<br />protected methionine (RPMet) on milk composition of lactating<br />Cashmere Rayeni goats. METHODS: 40 healthy singleton<br />Cashmere Rayeni goats about 3 to 4 years of age, at the first day of<br />lactation, were randomly divided into 2 equal control and<br />experimental groups. The experimental group was supplemented<br />with 5 gr/day RPMet for 60 days. Milk samples of 2 groups were<br />taken on 30th and 60th days of the study. Milk protein, milk fat, milk<br />lactose, and milk Solids-not-Fat (SNF) were determined using<br />automatic analyzer. The results were statistically evaluated with<br />SPSS. RESULTS: The supplementation with RPMet did not effect<br />all of the above mentioned parameters during the 60 days of the<br />experiment (p>0.05), except for the milk fat percentage of the<br />experimental group which showed significant increase after 60<br />days (p<0.05). CONCLUSIONS: Our results about milk protein,<br />milk lactose, and SNF were in agreement with previous studies that<br />had not shown significant differences. Results about milk fat on the<br />30th day were in agreement with the results of several authors who<br />reported that RPMet did not affect milk fat percentage or yield;<br />however, in the present study milk fat increased significantly on the<br />60th day (p<0.05). To the best of the authors' knowledge, no study<br />about the effects of RPMet on milk composition of Cashmere<br />Rayeni goat has been done. https://ijvm.ut.ac.ir/article_52486_5105a52467ef6681cbee72225a32265e.pdf