نوع مقاله : مقاله پژوهشی
نویسندگان
1 دانشجوی دکتری، گروه علوم دامی، پردیس کشاورزی و منابع طبیعی دانشگاه تهران، کرج
2 دانشیار ، گروه علوم دامی، پردیس کشاورزی و منابع طبیعی دانشگاه تهران، کرج
3 دانشیار پردیس کشاورزی ومنابع طبیعی دانشگاه تهران
4 استاد، گروه علوم دامی، پردیس کشاورزی و منابع طبیعی دانشگاه تهران، کرج
چکیده
کلیدواژه‌ها
عنوان مقاله [English]
نویسندگان [English]
History and Objective: Supplying the needs of dairy cows in the early lactation period that have low dry matter intake and high protein requirements is important. Methyl groups are not synthesized in the body of living organisms, but are supplied through feed sources such as betaine, choline, pyridoxine and methionine. Of the three sources (choline, betaine, and methionine) that have the methyl group in their structure, only betaine can be directly involved as a methyl group donor in the transmission cycle of this group in the liver, and many key bodily functions such as Growth, liver safety (effective role in fat metabolism and liver protection) and lactation are affected, so in the present study, the nutritional effects of protected betaine at one level and unprotected at two levels on bovine plasma parameters Holstein Dairy Cows was examined.
Materials and methods: To Investigate the nutritional effects of protected and unprotected betaine on plasma parameters of dairy cows, 40 Holstein dairy cows (Average production 38 ± 2.1 kg and lactation days 5 to 35 days) with history of at least two deliveries were randomly used in 5 eight -head treatments. The experiment lasted one month (the first 14 days of the adaptation period and the next 16 days of the main experiment period). Experimental diets included: 1- control diet 2- diet containing 50 g of unprotected Betaine supplement 3- Diet containing 50 g of externally produced protected Betaine supplement 4- Diet containing 100 g of unprotected Betaine supplement; 5- Diet containing 50 g of protected Betaine produced. The cows received a perfectly mixed base diet containing the above Betaine additives. In two promises (10 am and 10 pm). The amount of dry matter consumed for each treatment was measured daily and Blood samples were also taken at the beginning and end of the experiment. Analysis of feed consumption data and plasma parameters were performed by SAS software and Mixed procedure.
Findings: In this experiment, no significant difference (P>0.05) in the amount of glucose, cholesterol, triglyceride, calcium, phosphorus and magnesium was observed between the experimental groups. The amount of non-esterified fatty acids (0.576 mm/l) and beta-hydroxy butyrate (0.428 mm/l) in the group receiving protected betaine production was lower than the other groups and their difference was significant at the level of P=0.0001 In addition, the amount of liver enzymes such as aspartate aminotransferase (5.11 IU/L), aspartate aminotransferase (56.1 IU/L) and alkaline phosphatase (0.396 IU/L) in the five treatment decreased compared to other groups and at the level (P <0.05) Became meaningful.
Conclusion: The results of the present experiment showed that there was a significant decrease (p < 0.05) in the amount of non-esterified fatty acids, beta-hydroxy butyrate and the amount of plasma liver enzymes due to the consumption of protected betaine produced compared to the control group in dairy cows. therefore, the use of 50 g of protected betaine produced in the early stages of lactation is recommended.
کلیدواژه‌ها [English]
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