Article Id: ARCC596 | Page : 322-332
Nazam Khan*, F.A. Sheikh, Madhu Suman Rana, Kamala Kant1 and Neelam Kewalramani drnazamkhan@yahoo.com
Address : Dairy Cattle Nutrition Division, National Dairy Research Institute, Karnal-132 001, India


As production of milk by dairy cow increases, research has focused on increasing the supply of amino acids to high producing dairy cows. Methionine and Lysine often are implicated as limiting amino acids for milk production. Choline is also an essential component of phospholipids which is important for proper membrane function and in the structure of lipoproteins, improves milk fat, overall production and reduces the risk of ketosis and reproductive disorders. Unfortunately, if unprotected crystalline amino acids are fed to cows, ruminal bacteria degrade it resulting in little increase in passage of these respective amino acids to small intestine. However, there is difference of opinion among researchers regarding the effect of protected methionine, lysine and choline on dry matter intake, digestibility, milk yield, its composition and blood profile of lactating dairy cows. Therefore present review discusses the effect of these protected amino acid supplementations on dry matter intake, digestibility, milk yield, milk composition and blood profile of lactating cows.


: Rumen protected methionine Lysine Choline Lactating cows.


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