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Title of the paper: Comparing investigations of growth progresses of pigs. I. Growth progresses by comparisons of groups and individualsThe variability of delivered groups of fattened pigs is attempted to decrease always. For that it is essential to gather knowledges about the typical, separate development periods and points of inflection of growth patterns in order to work out indications for influencing the process engineering. Statements coming from experimental tests arn´t transferable without doubt. Therefore, it is of importance to realize also tests under production conditions. Under the tests, the first realized in farm I 1989, the second realized in the farms IIa/ IIb 2005, here ought be published the investigation of pig groups and individuals in 1989. For 276 hogs the ages and the weights were registred five times. For each animal were ascertained the function parameters (growth function of Lehmann) from their dataset. Consequently could be determined the "theoretical possible end weight" (x E ). According to these book values the datasets were sorted increasingly and divided into groups. Group 1 contains the animals with low x E and group 11 the with high. The comparison of pig groups leads to following statements: 1. A low x E corresponds with a high growth intensity (WI) and contrariwise. 2. The higher the WI the earlier the animals reach their maximum of daily live weight gains (t Zmax ) and the faster the animals cross this maximum. These statements were confronted with those of individuals. The selected animals 117 and 59 show identical x E . The higher WI express in a faster crossing of the t Zmax (confirmation of the second statement), but the faster reaching cannot be confirmed. At a compare of two other animals with same WI can be determined that they have different x E . With it the first statement can´t be confirmed in the complete consequence.

The application of a correlation method for the measurement of gas (vapor) bubble velocity in liquid flow is described. Contrary to previous similar procedures an optical method (laser light) is used for the bubble (or void) detection. First experimental results are reported.