Resumo

AROUCA, C.L.C. et al. Available phosphorus requirement of barrows from 30 to 60kg selected for high lean deposition. Arq. Bras. Med. Vet. Zootec. [online]. 2009, vol.61, n.5, pp. 1095-1103. ISSN 0102-0935.  http://dx.doi.org/10.1590/S0102-09352009000500012.

An experiment was carried to determine available phosphorus requirement of crossbred barrows (Agroceres-Pic), using 60 animals in a completely randomized block design with five dietary treatments - 0.1; 0.2; 0.3; 0.4; and 0.5% of available phosphorus, six replicates, and two animals per experimental unit. On the 21^st day of the experiment and at its end, blood samples were collected from orbital plexus of fasting animals to analyze and register alkaline phosphatase and serum phosphorus values. Quadratic effect of available phosphorus level on average daily gain, daily feed intake, serum phosphorus on the 21^st day of the experiment, serum phosphorus at the end of the experiment, and feed conversion ratio were observed. Minimum feed conversion ratio was estimated for animals fed diets containing 0.39% available phosphorus. There was a linear effect of available phosphorus level on daily phosphorus intake, alkaline phosphatase on the 21^st day and alkaline phosphatase at the end of the experiment. Dietary available phosphorus requirement for 30 to 60kg high lean barrows was 0.39%, which corresponds to an available phosphorus intake of 9.11g/day.

Palavras-chave : swine; requirement; phosphorus; growth; performance.