Richards Chris J, Hicks Britt
Department of Animal Science, Oklahoma State University, 201 Animal Science, Stillwater, OK 74078, USA.
Vet Clin North Am Food Anim Pract. 2007 Jul;23(2):207-21, vi. doi: 10.1016/j.cvfa.2007.05.006.
Approximately 75% to 80% of expenses involved in cattle feeding in commercial feedlots are feed costs. Grains are used in feedlot diets to improve the performance and efficiency of feedlot cattle by increasing the energy density of diets. Grains for these diets are commonly processed for various reasons, including improving palatability, altering particle size, increasing digestibility, altering the rate, site, and extent of digestion, and facilitating preservation or storage. Altering the rate, site, and extent of digestion in turn can alter cattle performance. This article focuses on processing methods common to feedlots and the primary grains fed, corn and grain sorghum.
在商业饲养场中,肉牛饲养成本的大约75%至80%是饲料成本。饲养场日粮中使用谷物,通过提高日粮的能量密度来提高饲养场肉牛的性能和效率。出于各种原因,这些日粮中的谷物通常会经过加工,包括提高适口性、改变颗粒大小、提高消化率、改变消化的速率、部位和程度,以及便于保存或储存。反过来,改变消化的速率、部位和程度会改变肉牛的性能。本文重点介绍饲养场常见的加工方法以及主要饲喂的谷物——玉米和高粱。