饲粮能量和蛋白质水平对鸵鸟羽毛、皮肤和结节生长的影响。

IF 0.9 4区 农林科学 Q3 VETERINARY SCIENCES Journal of the South African Veterinary Association Pub Date : 2020-09-17 DOI:10.4102/jsava.v91i0.2000
Tertuis S Brand, Werne J Kritzinger, Daniel A Van der Merwe, Anieka Muller, Johannes P Van der Westhuyzen, Louwrens C Hoffman
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引用次数: 2

摘要

为了达到最佳产量,需要精确的饲料配方来满足鸟类的营养需求。了解皮肤、结节和羽毛的生产特征如何随不同营养密度的日粮而变化,将有助于最低成本的建模。羽毛生长和结节发育是以前在鸵鸟日粮配方中被忽视的因素,这两个因素对于预测生产模型的发展至关重要。在这项试验中,120只鸟被安置在15个围栏中。不同的能量状态(高、中、低)以及相应的蛋白质和氨基酸水平(1-5级)被随意分配到每个猪栏。分别在1、35、63、103、159、168和244日龄时,从每个栏中随机选择1只鸡屠宰。在屠宰过程中,每只鸟都要称重,昏迷,放血,拔毛,取出内脏。从皮肤的四个部位拔下羽毛并称重。测量了翼羽的轴径。在每个屠宰年龄测量晒黑皮肤的结节大小。将数据转化为自然对数,并与总羽重和无羽空体总蛋白重进行回归,建立异速生长方程。提出了一种确定活鸟结节大小的预测方程。饲料成本优化是最重要的,本研究的结果将有助于建立最低成本优化(模拟)配方模型。
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The effect of dietary energy and protein level on feather, skin and nodule growth of the ostrich (Struthio camelus).

Accurate diet formulations are required to fulfil the nutrient requirements of birds in order to achieve optimal production. Knowing how the skin, nodule and feather production characteristics vary with diets of different nutrient densities will help in least-cost modelling. Feather growth and nodule development are factors that were previously neglected in ostrich diet formulation, both of which are essential for the development of a predictive production model. In this trial, 120 birds were placed in 15 pens. Varying energy regimes (high, medium and low) and accompanying protein and amino acid profile levels (level 1-5) were assigned ad libitum to each pen. A randomly selected bird from each pen was slaughtered at 1, 35, 63, 103, 159, 168 and 244 days of age. During the slaughter, each bird was weighed, stunned, exsanguinated, defeathered and eviscerated. Feathers from four regions of the skin were plucked and weighed. The shaft diameter of the wing feathers was measured. The nodule size of the tanned skin was measured for each slaughter age. The data were transformed to natural logarithms and regressed against the total feather weight and the total featherless empty body protein weight to set up allometric growth equations. A prediction equation to determine nodule size of the live bird was proposed. Feed cost optimisation is paramount, and results from this study will aid in setting up least-cost optimisation (simulation) formulation models.

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来源期刊
CiteScore
1.50
自引率
0.00%
发文量
23
审稿时长
22 weeks
期刊介绍: The Journal of the South African Veterinary Association is a contemporary multi-disciplinary scientific mouthpiece for Veterinary Science in South Africa and abroad. It provides veterinarians in South Africa and elsewhere in the world with current scientific information across the full spectrum of veterinary science. Its content therefore includes reviews on various topics, clinical and non-clinical articles, research articles and short communications as well as case reports and letters.
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