Baĭkov B D, Petkov G, Dzhankov T, Delev K
Vet Med Nauki. 1984;21(2):73-83.
Tests were carried out at two densities of raising the broilers on productional premises--16.6 and 23.6 per 1 m2 of flooring. Both the prophylactic programme and the conditions of tending and feeding were one and the same on the premises used. Each one of these was supplied with a cell in which birds were kept at the same density value as that on the other premise. Thus, four groups were formed in all: I--broilers kept at the rate of 16.6 per sq. m, II--broilers raised on the premise at 23.6/m2, III--broilers kept in a cell at 16.6 on the same premise where the other birds were kept at 23.6, and IV--broilers kept at 23.6 per sq. m. on the premise where the rate concerning the other birds was 16.6. The basic integral indices of the production effectiveness as well as the bioconversion of the dietary amino acids were followed up. It was found that during the transitional period the lower productional results with the broilers raised at higher densities were due to the action of biotic factors, and, more specifically, to the changes in the homotypical reactions that were the result of the higher density of raising. In the summer season the pesimal effect produced was a complex one, including not only the biotic factors but also the unfavourable action of the temperature and humidity regime.
在生产场所对肉鸡进行了两种饲养密度的试验，即每平方米地面饲养16.6只和23.6只。在使用的场所，预防方案以及饲养和喂食条件都是相同的。每个场所都配备了一个饲养单元，其中鸡的饲养密度与另一个场所相同。这样总共形成了四组：第一组——每平方米饲养16.6只的肉鸡，第二组——在该场所每平方米饲养23.6只的肉鸡，第三组——在其他鸡每平方米饲养23.6只的同一场所，饲养单元中每平方米饲养16.6只的肉鸡，第四组——在其他鸡每平方米饲养16.6只的场所，每平方米饲养23.6只的肉鸡。对生产效率的基本综合指标以及日粮氨基酸的生物转化率进行了跟踪。结果发现，在过渡时期，饲养密度较高的肉鸡生产成绩较低是由于生物因素的作用，更具体地说，是由于饲养密度较高导致的同型反应的变化。在夏季，产生的负面影响是复杂的，不仅包括生物因素，还包括温度和湿度条件的不利影响。
