Texas A&M AgriLife Research, Texas A&M System, San Angelo 76901.
J Anim Sci. 2013 Oct;91(10):4628-32. doi: 10.2527/jas.2012-6226. Epub 2013 Jul 26.
Data from Dorper and Rambouillet ram lambs (n = 79) were used to estimate breed means for postweaning growth rate, feed intake, feed conversion efficiency (kilograms of gain divided by kilograms of feed consumed), and residual feed intake on a high concentrate diet during the typical age and weight range for U.S. lamb production. Lambs were progeny of 6 unrelated sires/breed and were born over a 2-yr period. Dams of the lambs were a representative sample of Dorper ewes in the United States and Rambouillet ewes in Texas. Data were analyzed using SAS PROC MIXED with a model that included year, breed, birth type, and feeder pen as fixed effects and sire as a random effect. The mean BW at the start of the feeding trial was 31.4 ± 3.7 kg at a mean age of 92.7 ± 9.2 d. Electronic feeders were used to record individual animal feed intake. Growth rate and feed intake were measured for 77 d during the postweaning growth period. Mean ADG was 340 ± 9.2 g for Dorper lambs and 346 ± 8.6 g for Rambouillet lambs. The mean final bodyweight was 58.1 ± 4.8 kg when the mean age was 170 d. Average daily feed intake was 2,223 ± 50 g for Dorper lambs and 2,215 ± 48 g for Rambouillet lambs. Feed conversion efficiency was 0.153 ± 0.003 for Dorper lambs and 0.158 ± 0.003 for Rambouillet lambs. No significant differences were observed between Dorper and Rambouillet lambs for weaning weight, postweaning gain, final weight, feed intake, feed conversion efficiency, or residual feed intake. Growth rate, feed intake, and feed conversion efficiency were similar for Dorper and Rambouillet ram lambs fed from a mean of 31 kg BW and 93 d of age to a mean BW of 58 kg and a mean age of 170 d.
使用多伯雷和雷默朗公羊（n = 79）的数据来估计断奶后生长速度、饲料摄入量、饲料转化率（每千克增重除以每千克饲料消耗）和高浓缩饲料的剩余饲料摄入量的品种均值，这是在美国典型的羔羊生产年龄和体重范围内。羔羊是 6 个无关系谱父本/品种的后代，在 2 年期间出生。羔羊的母羊是美国多伯雷母羊和德克萨斯州雷默朗母羊的代表性样本。使用 SAS PROC MIXED 中的模型分析数据，该模型包括年份、品种、出生类型和饲养栏作为固定效应，父本作为随机效应。在开始喂养试验时，平均 BW 为 31.4 ± 3.7 kg，平均年龄为 92.7 ± 9.2 d。使用电子饲料器记录个体动物的饲料摄入量。在断奶后生长期间，进行了 77 天的生长速度和饲料摄入量测量。多伯雷羔羊的平均 ADG 为 340 ± 9.2 g，雷默朗羔羊的平均 ADG 为 346 ± 8.6 g。当平均年龄为 170 d 时，平均最终体重为 58.1 ± 4.8 kg。多伯雷羔羊的平均日采食量为 2,223 ± 50 g，雷默朗羔羊的平均日采食量为 2,215 ± 48 g。多伯雷羔羊的饲料转化率为 0.153 ± 0.003，雷默朗羔羊的饲料转化率为 0.158 ± 0.003。多伯雷和雷默朗羔羊在断奶体重、断奶后增重、最终体重、饲料摄入量、饲料转化率或剩余饲料摄入量方面没有差异。从平均 31 千克 BW 和 93 日龄开始，到平均 58 千克 BW 和平均 170 日龄，多伯雷和雷默朗公羊的生长速度、饲料摄入量和饲料转化率相似。
