摘要
The objective of this work was to study the effects of partial substitution of corn grain (COR) by dry cassava starch byproduct (CAS) on feed intake, weight gain, feed conversion and carcass physical characteristics in crossbred beef heifers finished in feedlot. Fifty-four heifers, of approximately 15 mo of age and 317 kg mean liveweight, were randomly distributed, in blocks according to breed group, between two treatments, with 27 replicates for performance characteristics and 9 for carcass evaluation. The animals were fed ad libitum twice daily, with corn silage and one of two different concentrates, based on soybean meal and either COR or half COR and half CAS as energy source. No differences (P>0.05) were found between treatments in the variables studied, overall mean values being: daily weight gain (1.1 kg), dry matter (DM) intake (9.1 kg), DM intake/100 kg liveweight (2.6 kg), feed conversion ratio (8.4), warm carcass weight (209.3 kg), carcass weight in arrobas (13.9), carcass yield (51.7%) carcass length (121.1 cm), leg length (71.5 cm), rump roast thickness (25.5 cm), subcutaneous fat thickness (6.6 cm), muscle percentage (30.5), bone percentage (15.5), and muscle plus fat:bone proportions (5.4:1). The dry cassava byproduct can replace 50% of corn in the concentrate without effects on performance and carcass characteristics of crossbred heifers finished in feedlot.
摘要译文
这项工作的目的是研究玉米粒（COR）的干木薯淀粉副产品（CAS）对采食量部分替代，体重增加的影响，在杂交肉牛母牛饲料转化率和胴体物理特性的饲养场完成。五十四小母牛，约15月龄和317公斤意味着活重，随机分布的，在块根据品种组，两种治疗之间，具有27个重复对的性能特征和9胎体评估。将动物每日两次随意喂食，玉米青贮饲料和两种不同的浓缩物之一，基于豆粕和任COR或COR半，一半CAS号作为能量来源。无差异（P 0.05）的处理之间发现了研究，整体平均值作为变量：每日体重增加（1.1千克），干物质（DM）的摄取（9.1千克），干物质采食量/ 100 Kg活体重（2。6公斤），饲料转化率（8.4），暖胴体重（209.3千克），在阿罗瓦胴体重（13.9），屠宰率（51.7％），胴体长（121.1厘米），腿长（71.5厘米），臀烤厚（25。5厘米），皮下脂肪厚度（6.6厘米），肌肉率（30.5），骨的百分比（15.5），和肌肉加脂：骨的比例（5.4：1）。干木薯副产品可以在没有集中在育肥杂交完小母牛性能和胴体品质的影响替代玉米的50％。
J. de Araujo Marques , D. Maggioni , R.E. da Silva, I. Nunes do Prado, F.L.B. Cavaliere, S. Ferreira Caldas Neto, F. Zawadzki. Partial replacement of corn by cassava starch byproduct on performance and 'carcass characteristics of feedlot heifers[J]. Archivos Latinoamericanos de Produccion Animal, 2005,13(03): 103-108