Effect of Using Barley Grain and Wheat Bran of Reduced Ruminal Degradability on Milk Production and Composition by Awassi Ewes under Pasture Condition

M. M. Kassem

Abstract


The effect of high and low levels of dietary protein with or without treatment of barley grain and wheat bran with acid- formaldehyde reagent (9L/ton) to reduce the rate of starch and protein digestion in the rumen, on milk secretion and composition in lactating ewes was studied. Twenty four Awassi ewes, 3-4 years old, with their lambs were divided into 4 groups (6 ewes each). Each group received one of the 4 dietary treatments as following: LU (untreated) 13% Cp, LT contained 13% Cp treated with formaldehyde reagent, HU contained 16% Cp (untreated) and HT contained 16% Cp treated with formaldehyde reagent. Fat (4%) corrected milk (FCM) yield was increased (P < 0.05) with diets of low and high protein level LT, HT (1201, 1363 g/d) compared with untreated diets LU, HU (1043, 1080 g/d), respectively. The treatment of barley grain and wheat bran with high protein level concentrated diet HT increased (P < 0.05) milk fat content and milk fat yield compared with LU, LT and HU diets. The RDP contents were 9.89, 6.58, 11.81 and 8.19 g/MJ of ME for diets LU, LT, HU and HT, respectively. However, reduced ruminal degradability of barley and wheat bran seems to improve milk production and composition apparently by increasing (MP: ME) ratio in the absorbed nutrient with both levels of used protein.

Keywords


Ewes, Protein level, Reduced degradability, Milk yield

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