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现在,测定配合饲料耐水性的方法和仪器(包括作者曾建议的方法和仪器——参见РИР1979年12期、1980年11期、1982年1期),有一个严重的缺点,就是在试验过程中不能改变水的 PH 值。实际上,PH 值的变动范围是相当大的。比如池塘有水花时,PH 值高达8～9,而在年内某一段时期它又会降至5。鱼用配合饲料的试验,通常是在实验室的自来水中(中性)进行的,自来水的特点就是 PH的固定值约7,换句话说,在这种实验室条件下是不必考虑 PH 值的影响的,但是,正如我们试验所证明的那样:PH 值对配合饲料的耐水性、颗粒饲料的吸水性以及饲料的破坏程度都有一定的影响。图1是表明 PH 值与饲养池塘鲤科鱼类的配合颗粒饲料(111—1号配方)吸水性的相关曲线。曲线α是 PH 值等于7时饲料的吸水率,曲线δ是 PH 值等于9
At present, the method and apparatus for measuring the water resistance of feedstuffs, including the methods and instrumentation suggested by the authors - see РИР, 1979, No. 12, 198011, No. 1, 1982. One serious disadvantage is that during the test Can not change the water PH value. In fact, the range of the PH value is quite large. For example, ponds with water, the PH value of up to 8 to 9, and in a period of time during the year it will drop to 5. Fish feed tests, usually in laboratory tap water (neutral), tap water is characterized by a fixed value of about 7 PH, in other words, in this laboratory conditions do not have to consider the PH value However, as we have shown, the PH value has some influence on the water resistance of feedstuffs, the water absorption of pelleted feedstuffs and the degree of feedstuff destruction. Figure 1 is a graph showing the correlation between pH and the water absorption of pelleted pellets (formula No. 111-1) rearing pond carp. Curve a is the water absorption of the feed when the pH is equal to 7, and the curve δ is equal to 9 for the pH