Dietary phosphorus requirement of Holstein steers during early growing period

Abstract:

López, J.R., Montaño Gómez, M.F., Jorquera, A.P., Chavira, J.S. and Zinn, R.A. 2007. Dietary phosphorus requirement of Holstein steers during early growing period. J. Appl. Anim. Res., 31: 113–115. Ninety-six Holstein steer calves (120.7±5.3 kg) were used to evaluate the influence of dietary phosphorus level (0.27, 0.31, 0.35 and 0.39%, DMB) on growth-performance during the initial 105 d on feed. Dicalcium phosphate was the source of supplemental phosphorus. All diets were formulated to contain 0.85% calcium (DMB). Dietary phosphorus level did not affect (P>.10) DMI or body size measurements. However, increasing dietary phosphorus level increased ADG (linear component, P<.05), gain efficiency (quadratic component, P<.05) and dietary NE (quadratic component, P<.05). It is concluded that during the initial growing period ADG, gain efficiency and dietary NE are optimal at a dietary phosphorus level of …

Año de publicación:

2007

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