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Intake, apparent digestibility, milk composition and production of lactating cows fed four non protein nitrogen compounds levels



Intake, apparent digestibility, milk composition and production of lactating cows fed four non protein nitrogen compounds levels



Revista Brasileira de Zootecnia 30(4): 1358-1366



The objectives of this research were to detect how many days were necessary for animals to adapt to diets to measure intake and milk production and to evaluate the effect of four levels of crude protein in the nonprotein nitrogen (NPN)- based compounds (2.22; 4.18; 5.96 and 8.09%) on the milk composition and production, the intake and apparent digestibilities of dry matter (DM), organic matter (OM), neutral detergent fibre (NDF), ether extract (EE), total carbohydrates (CHOT) and crude protein (CP) and the intake of total digestible nutrient (NDT). Sixteen Holstein-Friesian cows were allotted to four balanced 4x4 Latin square design in accordance with the lactation period. The four experimental diets were formulated to contain 60% of corn silage and 40% of corn meal, soyabean meal, urea and mineral mix mixture. Crescent levels of urea in the concentrate (0.0; 0.7; 1.4 and 2.1%) for the treatment 1, 2, 3 and 4, respectively, were used. All diets were isoproteic with approximately 14% CP. There was a decrease in the intake of DM, OM, CP, CHOT and TDN and EE linearly increased as the NPN increased in the diets. The intake of NDF expressed as kg/day and %LW presented a quadratic response, with maximum intake values of 6.99 kg and 1.56% for 4.54 and 4.26% NPN, respectively. The total apparent digestibilities of DM, OM, NDF, EE, CP and CHOT were not influenced by the NPN level in the diets, with observed means of 69.45, 70.71, 62.26, 88.34, 70.57 and 70.91%, respectively. The milk production corrected or not for 3.5% fat, the fat and milk protein yield and milk protein content linearly decreased while the fat content and feed efficiency, expressed as kg milk/kgDM were not influenced by the NPN levels in the diet.

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