جستجوی مقالات مرتبط با کلیدواژه "متیونین محافظت شده" در نشریات گروه "علوم دام"

The growing trend of production and consumption of goat milk and its products in the modern dairy industry requires improving milk production and composition by nutritional methods. Optimal imbalance of biodegradable and non-biodegradable protein in ruminants can limit microbial protein production, nitrogen utilization efficiency, fiber digestion, and access to optimal amino acid levels in the small intestine. Supplementation of protein sources with low degradability improves nitrogen utilization efficiency and optimal amino acid pattern at the surface of the small intestine. Microbial amino acids meet the animal's need if the animal is in a state of maintenance or minimal growth, while to achieve maximum growth or production the need must be met by non-biodegradable protein in the rumen. Maximum production requires sufficient amounts of essential amino acids, so to support the physiological and production needs of livestock, the use of protected amino acid supplements in the rumen is recommended. Protected amino acids lysine and methionine are more commonly known as milk-limiting amino acids, and methionine also plays a unique role as a starting amino acid in protein synthesis. This study was performed to evaluate the protected methionine and its effects on milk production and composition in Alpine dairy goats.

The experiment was performed in a completely randomized design with at least 15 replications per treatment, so that 45 Alpine lactating goats with 200 lactation days for 4 weeks, randomly were allocated for three experimental diets included: 1- Basal diet plus 2 g of commercially protected methionine 2- Control (basal diet without protected methionine) 3- Basal diet plus 2 g of protected methionine synthesized in vitro.

The results showed that methionine coating significantly reduced the degradability of methionine in the rumen (p <0.001). Also, the effect of experimental treatments on milk production and composition as well as blood parameters such as albumin, cholesterol, total protein, glucose and triglyceride was not significant in lactating goats (p> 0.05).

using protected methionine can significantly reduce the degradability of methionine in the rumen but may has no effect on milk production and composition as well as blood parameters in dairy goats at farm situation, Of course more studies and data are needed.

This study was carried out to evaluate the effects of microwave irradiated (800 W) soybean meal (irradiated over 5 min) and ruminal protected methionine (Mepron; 3 g/day) on crossbreds Zel weight gain using 15 lambs with an average weight of 31. 52±2. 32 kg and similar condition score in a completely randomized design with 3 treatments in 5 replicates over 80 days. Three experimental treatements contain untreated soybean meal (T1)، microwave irradiated soybean meal (T2) and supplemented with Mepron as treatment 3 (T3). Weight in 15 days and daily feed consumption was determined and dry matter and nutrients digestibility among treatments were compared. Nine of the lamb were killed and their carcasses were evaluated. Daily Dry matter intake (2218. 64، 2699. 03 and 2775. 47 g in T1، T2 and T3 respectively)، final body weight (40. 08، 50. 48 and 52. 51 kg respectively in T1، T2 and T3)، daily weight gain (135. 75، 234. 51 and 248 g/day respectively in T1، T2 and T3) and carcasses characteristics between the control treatment and treatments 2 and 3 was significantly different، however there were similar among T2 and T3. The results of current experiment showed that microwave irradiated soybean meal and ruminal protected methionine (Mepron) can significantly improve lamb performance and their carcasses characteristics with increase weight of expensive muscle group (standard muscle groups 1 and 3) and rib eye area.

In order to examine the effect of using rumen protected methionine (Mepron، Evonik Industries، Hanau، Germany) on productive and reproductive performance under field condition، 195 Holstein cows were used in a unbalanced completely randomized design and 2 groups. Experimental treatments consisted of: 1) control group with 110 Holstein dairy cows (71±51 DIM and 47. 5±12 milk yield) and without Mepron and 2) experimental group with 85 Holstein dairy cows (85±59 DIM and 47. 0±12 milk yield) and 13 g Mepron per cow/d. Cows were group fed with TMR and 4 times a day. The diets were balanced with AminoCow® software. Using Mepron decreased CP content from 17. 05% in control group to 16. 47% in experimental group، while other nutrients were similar between two diets. Adding Mepron to diet resulted in a significant increase in dry matter intake (P

Fifty six Holstein lactating cows (71 days in milk; 35 Kg/day milk production) were employed in a complete block randomized design of repeated measurements. Cows were randomly allocated to two treatments based on their parity. Cows in group 1 were fed a balanced total mixed ration (600 g concentrate /kg DM and 400 g forages /kg DM) with 50 g Rumen Protected Methionine (RPM) per head per day (Methioplus 55%), while cows in group 2 were fed TMR without additive (control group). The experimental period was 40 days with 10 initial days for adaptation. RPM had no effect on milk production, milk composition and dry matter intake. Milk composition namely fat, protein, lactose, solid non fat and total solid percentage did not change by treatment (P>0.05). Cows treated with RPM bore a higher concentration of plasma glucose, and a lower plasma concentration of nonesterified fatty acids (NEFA; P<0.05). Cows in the two groups did not differ in body condition score changes during the experimental periods. It was concluded that RPM increased plasma glucose, decreased NEFA concentration, and can lead to a decrease in the incidence of ketosis and fatty liver in early lactation cows via improving liver function in fat metabolism and gluconeogenesis.