Department of Plant and Animal Production, Burdur Vocational School of Food, Agriculture and Livestock, Burdur Mehmet Akif Ersoy University, Burdur, 15030, Turkey.
Center for Agriculture, Livestock and Food Research, Burdur Mehmet Akif Ersoy University, Burdur, 15030, Turkey.
Trop Anim Health Prod. 2023 Jun 23;55(4):248. doi: 10.1007/s11250-023-03660-x.
In this study, growth performance, nutrient intake, thigh meat quality, fatty acid composition of thigh meat, and biomechanical characteristics of tibia of broiler chickens in response to phased restriction of dietary digestible lysine (dLys) were evaluated. A total of 180 male broiler chickens distributed to 3 experimental groups were fed control diets, 85% dLys diet in grower phase (GRO 85% dLys), or 85% dLys diets in grower and finisher phases (GRO-FIN 85% dLys). Feeding 85% dLys suppressed the feed intake that suppressed the growth performance, slaughter weight, and thigh weight of broiler chickens compared to control group (P < 0.05). Average daily dLys, Ca, and P intakes were suppressed in groups fed 85% dLys diets in comparison with control group (P < 0.05) due to the suppression of feed intake. While most fatty acid concentrations in thigh meat were not different among the groups, eicosanoic acid (C20:0) in thigh meat was greater in GRO-FIN 85% dLys group than control group (P = 0.002). Antioxidant status of thigh meat of broiler chickens was not affected by the phased restriction of dietary dLys compared to control group. Bone breaking strength and ultimate strength were greater in control group than 85% dLys groups (P < 0.05). In conclusion, phased dilution of dietary dLys to 85% of the required allowance yields weaker legs and tibia bones by suppressing the Ca and P intakes as a function of reduced feed intake in broiler chickens.
本研究评估了阶段性限制饲粮可消化赖氨酸（dLys）对肉鸡生长性能、养分采食量、大腿肉品质、大腿肉脂肪酸组成和胫骨生物力学特性的影响。将 180 只雄性肉鸡随机分配到 3 个试验组，分别饲喂对照饲粮、生长期 85% dLys 饲粮（GRO85% dLys）或生长期和育肥期 85% dLys 饲粮（GRO-FIN85% dLys）。与对照组相比，饲粮中 85% dLys 降低了肉鸡的采食量，从而抑制了肉鸡的生长性能、屠宰体重和大腿重（P<0.05）。由于采食量下降，饲粮中 85% dLys 组肉鸡的平均 dLys、钙和磷的日采食量均低于对照组（P<0.05）。虽然大腿肉中大多数脂肪酸浓度在各组间无差异，但 GRO-FIN85% dLys 组肉鸡大腿肉中的二十碳一烯酸（C20:0）高于对照组（P=0.002）。与对照组相比，阶段性限制饲粮 dLys 对肉鸡大腿肉的抗氧化状态没有影响。与对照组相比，85% dLys 组肉鸡的胫骨断裂力和最大强度更大（P<0.05）。综上所述，饲粮 dLys 阶段性稀释至 85%可满足需要，由于采食量下降导致钙和磷的采食量减少，从而使肉鸡的腿部和胫骨变弱。
