Institute of Animal Husbandry and Veterinary Medicine, Anhui Academy of Agricultural Science, Anhui Province Key Laboratory of Livestock and Poultry Product Safety Engineering, Hefei 230031, China.
Poult Sci. 2019 Sep 1;98(9):3571-3577. doi: 10.3382/ps/pez102.
This study was conducted to investigate the effects of cage size on growth performance, blood biochemistry, and antibody response in layer breeder males during rearing stage. 575 one-day-old Jinghong layer breeder males were randomly allocated into 3 treatments and reared in 3 cage sizes: large (160 × 160 × 62 cm; LC), medium (120 × 120 × 62 cm; MC), and small (80 × 70 × 62 cm; SC). The stocking density of birds in 3 treatments was kept identical and adjusted every 2 wk, from 45 birds/m2 during the period of 0 to 2 wk of age to 12 birds/m2 during the period of 17 to 18 wk of age. Body weight and shank length were measured every 2 wk, and then the daily weight gain and daily feed intake were calculated. Tibia length and breaking strength were determined at 8 wk of age. Blood parameters including malodiadehyde (MDA), glutathione peroxidase (GSH-Px), superoxide dismutase (SOD), alkaline phosphatase (ALP) and corticosterone (CORT), and antibody titers against avian influenza viruses H5N1 (Re-5 strain) and H9N2 (Re-2 strain) and Newcastle disease virus in response to vaccination were determined at 18 wk of age, respectively. Body weight, shank length, and daily weight gain of birds in LC were similar with those in MC, and were greater than those in SC at 18 wk of age (P < 0.05), respectively. No significant difference was found in average daily feed intake among the 3 treatments from 11 to 18 wk of age. Birds in LC and MC had the similar tibia length; however, birds in SC were smaller (P < 0.05). Tibia breaking strength of birds in LC was higher than those in SC (P < 0.05), respectively. Birds in LC showed lower plasma MDA, GSH-Px, SOD, and CORT contents than those in MC and SC (P < 0.05); however, birds in LC exhibited higher levels of serum antibody titers against H5N1 and H9N2 avian influenza viruses as compared with MC and SC (P < 0.05). Consequently, LC and MC were superior to SC and were beneficial for birds' growth and development.
本研究旨在探讨饲养阶段鸡笼大小对种公鸡生长性能、血液生化和抗体反应的影响。将 575 只 1 日龄的景红种公鸡随机分为 3 个处理组，分别饲养在 3 种不同大小的鸡笼中：大笼（160×160×62cm；LC）、中笼（120×120×62cm；MC）和小笼（80×70×62cm；SC）。3 种处理组的饲养密度相同，并每 2 周进行调整，从 0 至 2 周龄时的 45 只/m²调整至 17 至 18 周龄时的 12 只/m²。每 2 周测量体重和跗长，然后计算日增重和日采食量。在 8 周龄时测定胫骨长度和断裂强度。在 18 周龄时，分别测定血液中丙二醛（MDA）、谷胱甘肽过氧化物酶（GSH-Px）、超氧化物歧化酶（SOD）、碱性磷酸酶（ALP）和皮质酮（CORT）等参数，以及对禽流感病毒 H5N1（Re-5 株）和 H9N2（Re-2 株）和新城疫病毒的抗体滴度。18 周龄时，LC 组鸡的体重、跗长和日增重均高于 MC 组和 SC 组（P<0.05）。11 至 18 周龄时，3 个处理组的平均日采食量无显著差异。LC 组和 MC 组鸡的胫骨长度相似，而 SC 组鸡的胫骨长度较小（P<0.05）。LC 组鸡的胫骨断裂强度高于 SC 组（P<0.05）。LC 组鸡的血浆 MDA、GSH-Px、SOD 和 CORT 含量均低于 MC 组和 SC 组（P<0.05）；然而，LC 组鸡对 H5N1 和 H9N2 禽流感病毒的血清抗体滴度均高于 MC 组和 SC 组（P<0.05）。因此，LC 组和 MC 组优于 SC 组，有利于鸡的生长发育。
