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Nutrition of semi-heavy hens using prediction equations for energy requirements



Nutrition of semi-heavy hens using prediction equations for energy requirements



Revista da Sociedade Brasileira de Zootecnia 22(6): 1019-1032



In a randomized block experiment with 6 treatments and 5 replications 240 Dekalb-Warren semi-heavy laying hens fed from 37 to 52 weeks old on mixed feeds based on maize and soyabean oilmeal to appetite, according to DeKalb-Warren manual recommendations or using prediction equations for ME requirements proposed by the American National Research Council (NRC) in 1984 (ME = W0.75 (173 - 1.95T) + 5.5WG + 2.07EE), by Rostagno et al in 1983 (ME = 138.67W0.75 + 2WG + 2EE + 2W(21 - T)) or using 2 new equations proposed by the Universidade Federal de Vicosa (UFV), Brazil in 1989 for apparent and true ME energy requirements (AME = 148.19W0.75 + 3.84WG + 1.92EE + 2W(21 - T) and TMWE = 156.81W0.75 + 4.11WG + 2.05EE + 2.2W(21 - T)) where W = body weight, WG = weight gain, EE = weight of eggs produced and T = environmental temperature. Intake of feed and energy was 7.06% greater with to appetite feeding than that obtained using NRC and Rostagno et al equations and 3.87% greater than with UFV (1989) equations and manual recommendations. Energy intake did not affect performance. It is recommended that nutritional energy requirements and diet allowances be estimated using NRC and Rostagno et al equations. New equations are proposed to estimate energy requirements of semi-heavy laying hens corrected for maintenance and activity factors: AME = 145.63W0.75 + 3.84WG + 1.92EE + 2.0W(21 - T) and TME = 152.43W0.75 + 4.11WG + 2.05EE + 2.2W(21 - T).

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