Performance and carcass characteristics of feedlot lambs fed high grain diets with buffer compounds

Revista Brasileira de Zootecnia

Gastaldello Junior, Adilson Luis¹  Mendes, Clayton Quirino¹  Pires, Alexandre Vaz¹  Susin, Ivanete¹  Mourão, Gerson Barreto¹  Ferreira, Evandro Maia¹ 

[1] USP, Piracicaba

关键词: ionophores;    finishing;    limestone sources;    monensin;    pH;    rumen     IntroduçãoO confinamento é uma alternativa interessante para a terminação de cordeiros em comparação à utilização de pastagens;   

DOI  :  10.1590/S1516-35982010000300015

学科分类：兽医学

来源: Universidade Federal de Vicosa

【 摘 要 】

The objective of this study was to assess the effects of adding sodium bicarbonate or limestone sources with different particle sizes to the diet, and their interaction with sodium monensin, on the performance and carcass characteristics of feedlot lambs fed fed high grain diets. Forty two Santa Ines lambs were used with 21 ± 3 kg initial average body weight and 88 ± 5 days old in feedlot, placed a randomized complete block design in a 2 × 3 factorial arrangement with six treatments and seven replications. Animals were fed diet containing 90% concentrate, 10% "coastcross" hay, with one source of limestone (limestone or "filler" limestone) or sodium bicarbonate (NaHCO3), with or without monensin (30 mg/kg DM). No influence was observed of the buffering agents on dry matter intake or average daily gain. However, the feed conversion of the animals fed diet containing sodium monensin (3.34 kg DM/kg gain) was better than those fed diets containing monensin (3.32 kg DM/kg gain) compared to diets without monensin (3.58 kg DM/kg gain). There was no effect of the buffering agents on the carcass characteristics assessed: the mean values were 50.4%, 2.42%, 13.9 cm2 and 1.9 mm hot carcass weight, chilling losses, longissimus muscle area and fat thickness, respectively. Adding monensin to the diet improves feed conversion and may make the feedlot lambs system more profitable.

【 授权许可】

CC BY-NC