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A description of the growth and moulting of feathers in commercial broilers

机译：商业肉鸡羽毛的生长和粉碎的描述

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1. Changes in feather length and weight and daily losses of down, contour feathers, remiges and retrices were studied in two commercial broiler strains to determine feather growth and moult in broilers up to 112 d of age. 2. Ten pens of 20 chicks for each sex x strain were fed adequate amounts of dietary protein in a four-phase feeding programme. Ten birds were sampled per genotype at 14, 28, 42, 56, 70, 84, 98 and 112 d. Feather loss was determined for individual birds caged within a nylon net. 3. All feathers were dry-plucked from each of seven tracts, with representative feathers from the capital-cervical, dorsopelvic and interscapular, pectoral and femoral tracts being randomly selected. Three rectrices of the dorsocaudal tract and three primaries and secondaries of the humeral-alar tract of the right wing were evaluated. 4. The length of the selected feathers was measured, and the feathers from each tract and from the whole bird were weighed. 5. A wide range of rates of maturing (0.0250-0.0907/d) and mature weights (9.62-52.9 g) were evident between sampled tracts. 6. Feather weight failed to predict some moults which were detected by the measurement of feather losses. From the weight data, moulting was evident only in the humeral-alar and dorsocaudal tracts, whereas, when daily losses were measured, contour feathers accounted for over 0.7 proportion of feather losses. Logistic equations adequately described the cumulative losses of down, contour feathers and remiges. 7. Feather loss needs to be considered when feather growth is determined from feather weight at different ages. 8. The rate of maturing (B) of feathers was numerically higher in Ross males and females than in the Cobb strain. In females, B was higher than in males (0.0483vs. 0335/d) but the mature weight was lower (162vs. 230 g).
机译：1.在两种商业肉鸡菌株中研究了羽毛长度和重量和每日损失，轮廓羽毛，剪断和回转的变化，以确定羽毛生长和肉鸡的羽毛，高达112天。 2.每种性别X菌株的10张20只小鸡的含量在四相饲养程序中喂养足量的膳食蛋白。每种基因型在14,28,42,56,70,84,98和112d中对十只鸟类进行采样。针对尼龙网笼中的个体鸟类确定了羽毛损失。 3.所有羽毛都从七个暗影中排出，具有来自资本宫颈，背瓣和间隙，胸腺和股骨的代表羽毛被随机选择。评估了三个右翼的多摩骚的三个重型和三个原初和右翼肱骨急性疾病的脱扣。 4.测量所选羽毛的长度，并称重来自每个毛虫的羽毛。 5.在抽样的束之间明显达到各种成熟率（0.0250-0.0907 / d）和成熟的重量（9.62-52.9g）。 6.羽毛重量未能预测通过测量羽毛损失检测的换热器。从重量数据来看，蜕皮只在肱骨 - 南部和多莫达尔的尸体中显而易见，而当测量日常损失时，轮廓羽毛占羽毛损失的0.7比例。物流方程充分描述了下降，轮廓羽毛和剪贴的累积损失。 7.当羽毛增长从不同年龄的羽毛重量确定羽毛的生长时，需要考虑羽毛损失。 8.羽毛的成熟率（b）在罗斯男性和女性中的数量高于COBB菌株。在女性中，B高于男性（0.0483Vs。0335 / d），但成熟的重量较低（162Vs。230g）。

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