摘要
Increased cotton production in the Southwest U.S. has increased the availability of cotton byproducts for use in cattle diets. The objective of this experiment was to evaluate the inclusion of cotton byproducts in feedlot finishing rations on the performance, carcass characteristics, and fecal characteristics of steers. Crossbred beef steers (n = 64; BW = 318 ± 12.3 kg) were assigned to 1 of 2 experimental treatments in a randomized complete block design (8 pens/treatment; 4 steers/pen). Treatments included a control (CON) diet (7% hay, 15% wet corn gluten feed, 67% rolled corn, 5% liquid supplement) and a cotton byproduct (CTN) diet (7% gin trash, 15% whole cottonseed, 72% rolled corn, 5% water). Both diets included 0.75% urea and 5% dry supplement. The CTN steers tended to have a heavier final BW (P = 0.09) and greater ADG (P = 0.08). Over the entire feeding period, DMI was greater for CTN steers than CON steers (P = 0.04) with no difference in G:F between treatments (P = 0.89). The CTN steers had heavier HCW (P = 0.02) and greater fat thickness (P = 0.03) than CON steers, but marbling score and REA were not different between treatments (P ≥ 0.64). Steers fed the CON diet tended to have a lower YG (P = 0.07), less KPH fat (P = 0.09), and lower dressing percentage (P = 0.10) than CTN steers. Liver scores did not differ between treatments (P ≥ 0.17). Fecal scores were lower for CTN steers on d 56 (P = 0.03) and fecal pH tended to be higher for the CTN steers on d 28 (P = 0.09), but neither differed during other periods (P ≥ 0.18). These results suggest that cotton byproducts can be used in feedlot rations without adverse effects on performance or carcass characteristics.
摘要译文
美国西南部棉花产量的增加增加了用于牛日粮的棉花副产品的供应。本实验的目的是评估育肥猪日粮中棉副产品的性能，car体特性和粪便特性。杂交牛ste牛（n = 64； BW = 318±12.3千克）分配给随机全块设计的2个实验处理中的1个（8笔/处理； 4圈/笔）。处理包括对照（CON）饮食（7％干草，15％湿玉米蛋白饲料，67％玉米粉，5％液体补充剂）和棉副产品（CTN）饮食（7％杜松子酒垃圾，15％全棉籽，72） ％的玉米粉，5％的水）。两种饮食都包含0.75％尿素和5％干补充剂。 CTN ers牛趋向于具有较高的最终体重（P = 0.09）和较大的ADG（P = 0.08）。在整个饲喂期间，CTN ste牛的DMI大于CON（牛的PMI（P = 0.04），不同处理之间的G：F无差异（P = 0.89）。 CTN ers牛的HCW（P = 0.02）和脂肪厚度（P = 0.03）均比CON ers牛高，但不同处理之间的大理石花纹得分和REA差异无统计学意义（P≥0.64）。与CTN diet牛皮相比，饲喂CON饮食的牛皮具有更低的YG（P = 0.07），KPH脂肪（P = 0.09）和更低的敷料百分比（P = 0.10）。肝分数在各治疗之间无差异（P≥0.17）。在第56天时CTN score牛的粪便评分较低（P = 0.03），在第28天时CTN ers牛的粪便pH倾向于较高（P = 0.09），而在其他时期则无差异（P≥0.18）。这些结果表明，棉花副产品可用于饲喂日粮，而对生产性能或car体特性无不利影响。
Andrea L Warner [1]; Paul A Beck [1]; Andrew P Foote [1]; Colton Robison [1]; Kaitlyn Pierce [1]; Blake K Wilson [1]. 431 Late-Breaking: The effects of including cotton byproducts in a finishing ration on the performance, carcass characteristics, and fecal characteristics of crossbred beef steers[J]. Journal of Animal Science, 2019,97(Sup3)