Data/hora: 10/06/2024 14:19:36

Provedor de dados: | 96
País: | Brazil
Título: | Digestible phosphorus levels for barrows from 50 to 80 kg
Autores: | Santos Nieto,Viviane Maria Oliveira dos; Kiefer,Charles; Souza,Karina Márcia Ribeiro de; Gonçalves,Liliane Maria Piano; Bonin,Marina de Nadai; Santos,Tânia Mara Baptista dos; Carvalho,Kelly Cristina Nunes; Santos,Alexandre Pereira dos.
Data: | 2016-05-01
Ano: | 2016
Palavras-chave: | Feeding cost; Growth phase; Mineral requirement; Residue coefficient.
Resumo: | ABSTRACT This study was carried out to evaluate the levels of digestible phosphorus in diets for barrows with a high potential for lean meat deposition from 50 to 80 kg. Eighty barrows, with an initial weight of 47.93±3.43 kg, were distributed in completely randomized blocks, with each group given five levels of digestible phosphorus (1.86, 2.23, 2.61, 2.99, and 3.36 g kg−1). There were eight replicates, and two animals per experimental unit. Phosphorus levels did not significantly influence feed intake, weight gain, or feed conversion ratio. Daily digestible phosphorus intake increased linearly as levels of phosphorus in the diet were increased. Phosphorus levels did not significantly influence muscle depth, loin eye area, backfat thickness, or the percentage and quantity of lean meat in the carcass. A linear increase was observed for feeding cost as the levels of digestible phosphorus in the diet were increased, and the level of 1.86 g kg−1 cost 29.4% less when compared with the level of 2.61 g kg−1. The dry matter, natural matter, the coefficient of the residue, and volatile solids of the waste were not significantly influenced by phosphorus levels. Conversely, it was possible to observe an increasing linear effect for total solids, total phosphorus, and total nitrogen in the waste of animals receiving diets with increased levels of digestible phosphorus. The level of 1.86 g kg−1, which corresponded to a daily intake of 4.77 g−1 of digestible phosphorus, meets the requirements of barrows weighing 50 to 80 kg.
Tipo: | Info:eu-repo/semantics/article
Idioma: | Inglês
Identificador: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982016000500242
Editor: | Sociedade Brasileira de Zootecnia
Relação: | 10.1590/S1806-92902016000500006
Formato: | text/html
Fonte: | Revista Brasileira de Zootecnia  v.45 n.5 2016
Fonte: | info:eu-repo/semantics/openAccess