Effect of Dietary Vitamin D3 and Ultraviolet B Light on Growth Performance, Blood Serum Parameters, Gut Histology, and Welfare Indicators of Broilers
Effect of Dietary Vitamin D3 and Ultraviolet B Light on Growth Performance, Blood Serum Parameters, Gut Histology, and Welfare Indicators of Broilers
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DOI：
10.3389/fanim.2021.806967
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发表时间：
2022-01-17
影响因子：
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通讯作者：
Asher, Lucy
中科院分区：
文献类型：
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作者：
Ogbonna, Amarachi Chijioke;Chaudhry, Abdul Shakoor;Asher, Lucy
包括鸡在内的所有养殖物种都经常遇到压力源，但这些压力源对动物及其生产力的影响可能会受到饲养环境条件的影响。研究了日粮维生素D3（vitD（3））和紫外线（UVB）对社交隔离应激肉鸡生长性能、器官重量、血清皮质酮（CORT）水平、血清25-羟基维生素D（25-OH-D-3）状态、肠道组织学和福利指标的影响。将一日龄（d）的Ross 308肉鸡（n = 192）单独称重，在翅膀上贴标签，并分配到非隔离（对照）组和隔离组;对照组的鸡从未被隔离，从第10天开始，每周3天，持续2周，（总暴露时间为1.30小时），治疗间隔为48小时。用饲料维生素D（3）以4，000 IU/kg（HD）或UVB光（UVB）处理鸟类。将UVB灯（24瓦12%UVB D3，55 cm）悬挂在基质上方50 cm处，波长：280-315 nm，强度：28.12 μ W/cm（2），用于所有处理组中的肉鸡，但在HD组中过滤以去除UVB。增长业绩衡量;在开始期（第10天）、生长期（第24天）和完成期（第38天）结束时估计体重增加、饲料摄入量和饲料转化率。分别在22/35和24/37日龄对肉鸡进行羽毛和步态评分以测量福利。对所选鸡称重并实施安乐死，以获得血清，从而测定25-OH-D-3和CORT水平、GIT重量和肠道组织学。将鸡进行为期2周的社会隔离（每周3次，每次15分钟）可增加CORT水平，但不改变GP和25-OH-D-3水平。然而，UVB处理的肉鸡表现出更好的福利，十二指肠吸收能力，并降低FCR相比，HD鸡。结果表明，一些有益的影响，UVB照明的福利指标和潜力，以支持室内饲养的商品肉鸡，这往往是挑战与压力的早期生命增长。
Stressors are commonly encountered by all farmed species, including chickens, but the impact of these stressors on the animal and their productivity can be influenced by the environmental conditions in which they are kept. This study investigated the effects of dietary vitamin D3 (vitD(3)) and ultraviolet light (UVB) on growth performance, organ weight, serum corticosterone levels (CORT), serum 25-hydroxy vitamin D (25-OH-D-3) status, gut histology, and welfare indicators of broiler chickens challenged with social isolation stress. One day (d) old Ross 308 broiler chicks (n = 192) were individually weighed, wing-tagged, and allocated to non-isolated (control) and isolated groups; control birds were never isolated, while isolated birds were subjected to regular sessions of social isolation for about 15-min periods over the course of 3 d a week for 2 weeks starting from d 10 (1.30 h total exposure) with inter treatment interval of 48 h. Birds were treated with either dietary vitD(3) at 4,000 IU/kg (HD) or UVB light (UVB). The UVB lamp (24 Watt 12% UVB D3, 55 cm) with wavelength: 280-315 nm, intensity; 28.12 mu W/cm(2) hung 50 cm above the substrate was used for the broilers in all the treatment groups but were filtered to remove UVB in the HD group. Growth performance measure; body weight gain, feed intake, and feed conversion ratio were estimated at the end of starter (day 10), grower (day 24), and finisher periods (day 38). Broilers were feather and gait scored to measure welfare at 22/35 and 24/37 days of age, respectively. The selected birds were weighed and euthanized to obtain serum to determine 25-OH-D-3 and CORT levels, GIT weights, and gut histology. Subjecting the birds to 2-week social isolation (for 15 min, three times per week) increased CORT levels but did not alter GP and 25-OH-D-3 levels of broilers. However, UVB-treated broilers demonstrated better welfare, duodenal absorptive capacity, and reduced FCR compared to HD chickens. Results suggest some beneficial effects of UVB lighting on welfare indicators and the potential to support early life growth of commercial broilers reared indoors, which are often challenged with stressors.