Becker Larissa L, Scholtz Emily E, DeRouchey Joel M, Tokach Mike D, Woodworth Jason C, Goodband Robert D, De Jong Jon A, Wu Fangzhou, Berg Kiah M, Ward Joe P, Neill Casey R, Gebhardt Jordan T
Department of Animal Sciences and Industry, College of Agriculture, Kansas State University, KS, USA.
Pipestone Nutrition, Pipestone, MN, USA.
Transl Anim Sci. 2022 May 20;6(2):txac069. doi: 10.1093/tas/txac069. eCollection 2022 Apr.
In the United States, emphasis has shifted toward improved pork quality and has resulted in greater use of Duroc-based terminal sires. Duroc sires have differences in ADG, ADFI, G:F, and carcass leanness compared to other sires. Therefore, our objective was to determine the standardized ileal digestible (SID) Lys estimates for Duroc-based sired finishing pigs. In Exp. 1, 2,124 pigs (DNA 600 ×PIC 1050, initially 48.9 kg) were used with 24-27 pigs per pen and 16 pens per treatment. Corn-soybean meal-based diets were fed in three phases (49-59, 59-71, and 71-81 kg). Pens were randomly allotted to 1 of 5 treatments based as a percentage of PIC (2016) SID Lys estimates for gilts (85%, 95%, 103%, 110%, and 120%). Phase 1 diets were formulated to 0.90%, 1.01%, 1.09%, 1.17%, and 1.27%, phase 2 to 0.79%, 0.87%, 0.94%, 1.03%, and 1.10%, and phase 3 to 0.71%, 0.78%, 0.85%, 0.92%, and 0.99% SID Lys. Increasing SID Lys increased (linear, < 0.001) ADG and Lys intake/kg of gain. A marginally significant improvement (quadratic, = 0.071) in G:F was observed as SID Lys increased. Feed cost, feed cost/kg of gain, revenue (linear, < 0.01) and income over feed cost (IOFC) increased (quadratic, = 0.045) with increasing SID Lys. In Exp. 2, 2,099 pigs (DNA 600 ×PIC 1050, initially 90.1 kg) were used with 24-27 pigs per pen and 20 pens per treatment. Corn-soybean meal-based diets were fed in 2 phases (90-106 and 106-136 kg). Pens were randomly allotted to 1 of 4 treatments based as a percentage of PIC (2016) SID Lys estimates for gilts (85%, 93%, 100%, and 110%). Phase 1 diets were formulated to 0.65%, 0.71%, 0.77%, and 0.84% and phase 2 to 0.60%, 0.66%, 0.71%, and 0.78% SID Lys. Overall, increasing SID Lys increased (linear, < 0.05) G:F, Lys intake/kg of gain, live weight and HCW, and increased (quadratic, = 0.020) ADG. Feed cost (linear, < 0.01), revenue, and IOFC increased (quadratic, ≤ 0.053) with increasing SID Lys. In conclusion, the SID Lys estimate for growth and IOFC was 1.19% or 4.63 g SID Lys/Mcal of NE, 1.05% or 4.04 g SID Lys/Mcal of NE, and 0.94% or 3.58 g SID Lys/Mcal of NE for pigs weighing 49-59 kg, 59-71 kg, and 71-81 kg, respectively. The SID Lys estimate for late finishing pigs was 0.74%-0.81% or 2.85-3.10 g SID Lys/Mcal of NE, and 0.69%-0.75% or 2.61-2.84 g SID Lys/Mcal of NE, for 90-106 kg and 106-136 kg pigs, respectively. These data provide SID Lys estimates for current Duroc-sired genetic lines raised in a commercial environment.
在美国，重点已转向提高猪肉品质，这导致更多地使用杜洛克终端父本。与其他父本相比，杜洛克父本在平均日增重（ADG）、平均日采食量（ADFI）、料重比（G:F）和胴体瘦肉率方面存在差异。因此，我们的目标是确定基于杜洛克的育肥猪的标准化回肠可消化（SID）赖氨酸估计值。在实验1中，使用了2124头猪（DNA 600×PIC 1050，初始体重48.9千克），每栏24 - 27头猪，每个处理16栏。以玉米 - 豆粕为基础的日粮分三个阶段投喂（49 - 59千克、59 - 71千克和71 - 81千克）。根据PIC（2016）后备母猪SID赖氨酸估计值的百分比，将栏随机分配到5个处理中的1个（85%、95%、103%、110%和120%）。第一阶段日粮的SID赖氨酸含量分别配制为0.90%、1.01%、1.09%、1.17%和1.27%，第二阶段为0.79%、0.87%、0.94%、1.03%和1.10%，第三阶段为0.71%、0.78%、0.85%、0.92%和0.99%。增加SID赖氨酸水平可提高（线性，<0.001）ADG和每千克增重的赖氨酸摄入量。随着SID赖氨酸增加，观察到G:F有轻微显著改善（二次曲线，=0.071）。随着SID赖氨酸增加，饲料成本、每千克增重的饲料成本、收入（线性，<0.01）和饲料成本收益（IOFC）增加（二次曲线，=0.045）。在实验2中，使用了2099头猪（DNA 600×PIC 1050，初始体重90.1千克），每栏24 - 27头猪，每个处理20栏。以玉米 - 豆粕为基础的日粮分两个阶段投喂（90 - 106千克和106 - 136千克）。根据PIC（2016）后备母猪SID赖氨酸估计值的百分比，将栏随机分配到4个处理中的1个（85%、93%、100%和110%）。第一阶段日粮的SID赖氨酸含量分别配制为0.65%、0.71%、0.77%和0.84%，第二阶段为0.60%、0.66%、0.71%和0.78%。总体而言，增加SID赖氨酸水平可提高（线性，<0.05）G:F、每千克增重的赖氨酸摄入量、活重和热胴体重，并提高（二次曲线，=0.020）ADG。随着SID赖氨酸增加，饲料成本（线性，<0.01）、收入和IOFC增加（二次曲线，≤0.053）。总之，对于体重49 - 59千克、59 - 71千克和71 - 81千克的猪，生长和IOFC的SID赖氨酸估计值分别为1.19%或4.63克SID赖氨酸/兆卡净能、1.05%或4.04克SID赖氨酸/兆卡净能和0.94%或3.58克SID赖氨酸/兆卡净能。对于90 - 106千克和106 - 136千克的后期育肥猪，SID赖氨酸估计值分别为0.74% - 0.81%或2.85 - 3.10克SID赖氨酸/兆卡净能和0.69% - 0.75%或2.61 - 2.84克SID赖氨酸/兆卡净能。这些数据提供了在商业环境中饲养的当前杜洛克父本遗传品系的SID赖氨酸估计值。
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