Relationship to growth performance of pneumonia and atrophic rhinitis lesions detected in pigs at slaughter among four seasons.
Relationship to growth performance of pneumonia and atrophic rhinitis lesions detected in pigs at slaughter among four seasons.
复制标题
四个季节屠宰猪中检测到的肺炎和萎缩性鼻炎病变与生长性能的关系。
DOI：
10.2460/javma.1992.200.10.1492
复制
发表时间：
1992
期刊：
影响因子：
--
通讯作者：
Knox Ke
中科院分区：
文献类型：
--
作者：
A. Scheidt;V. B. Mayrose;M. A. Hill;L. Clark;M. Einstein;Frantz Sf;L. Runnels;Knox Ke
选择了一个商业猪群进行研究，因为猪在屠宰时反复出现与地方性肺炎一致的肺部病变，并有典型的萎缩性鼻炎的鼻部病变。在一年中的不同季节出生的猪被分配到4个调查，从出生到屠宰进行评估。在屠宰场对单个肺和鼻子进行鉴定和收集，然后分别检查支气管肺炎和萎缩性鼻炎的大体病变。对每个病变进行评分，并在调查中进行以下比较：肺部病变的患病率和平均评分；鼻部病变的患病率和平均评分；肺病变评分和生长指标之间的相关性；鼻子病变级别和生长指标之间的相关性；以及肺病变评分和鼻子级别评分之间的相关性。生长指标包括生长阶段的平均日增重、育肥阶段的平均日增重、生长和育肥阶段的平均日增重以及达到104.5公斤体重的天数。对肺或鼻部病变的患病率、肺病变评分的平均值、鼻部病变分级的平均值以及各种生长指标的平均值进行检验，以确定4种调查结果之间的统计学差异。冬季屠宰的猪肺部病变发生率最高(96%)，秋季屠宰的猪最低(81%)。肺部病变的平均得分分别为7%(夏季)、5%(秋季)、9%(冬季)和16%(春季)。春季屠宰的猪的鼻部病变的患病率最高(85%)，秋季屠宰的猪的鼻子病变患病率最低(42%)。
A commercial swine herd was selected for study, because pigs at slaughter repeatedly had lung lesions consistent with enzootic pneumonia and had snout lesions typical of atrophic rhinitis. Pigs born during various seasons of the year were allotted to 4 investigations and were evaluated from birth to slaughter. Individual lungs and snouts were identified and collected at the slaughter plant and later examined for gross lesions of bronchopneumonia and atrophic rhinitis, respectively. Each lesion was scored, and the following comparisons were made within investigations: prevalence and mean scores for lung lesions; prevalence and mean grades for snout lesions; correlations between lung lesion scores and growth indicators; correlations between snout lesion grades and growth indicators; and correlations between lung lesion scores and snout grade scores. Included in the growth indicators were average daily gain during the growing phase, average daily gain during the finishing phase, average daily gain during growing and finishing phases, and days to attain 104.5 kg of body weight. Prevalence of lung or snout lesions, mean values for lung lesion scores, mean values for snout lesion grades, and mean values for the various growth indicators were tested for statistical differences among the 4 investigations. Prevalence of lung lesions was highest (96%) for winter-slaughtered and lowest (81%) for autumn-slaughtered pigs. Mean scores for lung lesions were 7% (summer), 5% (autumn), 9% (winter), and 16% (spring). Prevalence of snout lesions was highest (85%) for spring-slaughtered pigs and lowest (42%) for autumn-slaughtered pigs.(ABSTRACT TRUNCATED AT 250 WORDS)