Effects of Dietary Protein and Energy Levels on Productive and Reproductive Performance of Lactating Buffaloes

Iranian Journal of Applied Animal Science

مقاله 8، دوره 1، شماره 1، خرداد 2011، صفحه 57-63   

نویسندگان

H.M.A. Gaafar^{* 1}؛ E.M. Abdel-Raouf²؛ M.M. Bendary¹؛ G.H.A. Ghanem¹؛ K.F.A. El-Riedy¹

¹Animal Production Research Institute, Agricultural Research Center, Dokki, Egypt

²Department of Animal Production, Faculty of Agriculture, Kafrelsheikh University, Egypt

چکیده

Twenty eight lactating buffaloes were used in a completely randomized design with 2×2 factorial arrangement of four experimental diets including low protein–low energy (LP-LE), low protein–high energy (LP-HE), high protein–low energy (HP-LE) and high protein–high energy (HP-HE). Results showed that the HP-HE diet recorded the highest digestibility coefficients of CP, EE, NFE, nutritive values, TDN and DCP intake, while HP-LE diet had the highest CF digestibility (P<0.05). The HP-HE diet had the highest (P<0.05) actual milk and 7% FCM yield and the contents of protein, lactose, SNF and TS in milk, HP-LE diet had the highest fat content (P<0.05). The HP-HE diet showed the lowest amounts of DM and TDN per kg, 7% FCM, while LP-HE diet had the lowest amount of DCP per kg 7% FCM (P<0.05). The LP-HE diet recorded the lowest average daily feed cost, while HP-HE diet showed the lowest feed cost/kg 7% FCM and the highest total revenue and economic efficiency (P<0.05). Buffaloes fed HP-HE diet showed short periods from parturition to first estrus and first service, service period, days open, the lowest number of services per conception and the highest conception rate (P<0.05).

کلیدواژه‌ها

economic efficiency؛ feed conversion؛ milk yield and composition؛ reproductive traits

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