Nir I, Hillel R, Ptichi I, Shefet G
Hebrew University of Jerusalem, Faculty of Agriculture, Rehovot, Israel.
Poult Sci. 1995 May;74(5):771-83. doi: 10.3382/ps.0740771.
Three experiments were conducted to study the effect of particle size obtained by grinding wheat and sorghum in a hammer mill (HM) or roller mill (RM) on broiler performance. Broilers were fed a mash diet or crumbles to 4 wk of age, then pellets to 7 wk of age. When fed as a mash, diets produced with RM-ground grain improved performance. The effect of grinding was additive to that of pelleting. The interactive effects observed between grinding method and the form of the feed on body weight and feed intake were explained by the higher response to pelleting when grains were ground in HM vs RM. The positive effect of grinding in RM on feed utilization was found to be additive to that of pelleting in all three experiments. The response of females to feed texture was less pronounced than that of males. In males, feeding pellets vs mash increased mortality due to ascites threefold, whereas grinding method had no effect. Females were less susceptible to ascites than males, and feed texture had no effect in this respect. The effects of grinding and pelleting on the gastrointestinal tract segments were additive. The main effects of feed texture were a significant increase in stomach weight and that of its contents following HM grinding and a decrease in these following pelleting, with no interactions between the two.
进行了三项试验，以研究用锤片式粉碎机（HM）或辊式粉碎机（RM）研磨小麦和高粱所得到的粒度对肉鸡生产性能的影响。肉鸡在4周龄前饲喂粉料或破碎料，然后在7周龄前饲喂颗粒料。当以粉料形式饲喂时，用RM研磨谷物配制的日粮可提高生产性能。研磨的效果与制粒的效果具有累加性。当谷物用HM研磨与用RM研磨相比时，对制粒的反应更高，以此解释了研磨方法与饲料形式之间对体重和采食量的交互作用。在所有三项试验中，发现RM研磨对饲料利用率的积极作用与制粒的作用具有累加性。母鸡对饲料质地的反应不如公鸡明显。在公鸡中，饲喂颗粒料与粉料相比，因腹水导致的死亡率增加了三倍，而研磨方法没有影响。母鸡比公鸡更不易患腹水，并且在这方面饲料质地没有影响。研磨和制粒对胃肠道各段的影响具有累加性。饲料质地的主要影响是，HM研磨后胃重量及其内容物显著增加，制粒后则减少，二者之间没有交互作用。
