Conference paper
APPLICATION OF ASYMETRIC S-FUNCTION FOR ANALYSIS AND VALUATION OF THE GROWTH OF BOARS
Gordana Kralik
; Faculty of Agriculture, University Josip Juraj Strossmayer, Osijek, Republic of Croatia
R. Scitovski
; Faculty of Electrical Engineering, University Josip Juraj Strossmayer, Osijek, Republic of Croatia
Đuro Senčić
; Faculty of Agriculture, University Josip Juraj Strossmayer, Osijek, Republic of Croatia
Abstract
Growth capacity of the pig is a subject of permanent research. The growth rate of pigs has different quantitative and qualitative course. Profitability of pig rearing is in use of progressive growth stage, i.e. phase. This study deals with the curves of growth of the Large White breed, based on the gain intensity of the animals tested with the body weights of 30 to 100 kg. According to the average daily gains the boars were deviced into three groups (0.81 - 0.90 kg,0.91 - 1.0 kg and 1.01 to 1.10 kg). For description of the growth rate the asymmetric S- function was used modelled as: F(t)=A/(1+be⁻ᶜᶢᵗ)¹¤ᶢ. Regarding the necessary time for achievement of certain mass, the stages are separated as: preparations (t=tв), growth-both progressive and degressive (t=tв=tс) and phase of saturation (t=tc). The analysis showed that boars, entering the test in younger age, showed higher growth intensity than those beginning the test in older age(77.4; 83.4 and 82.6 days). In these boars the stage of progressive and degressive growth occurred earlier and lasted shorter period of time. The asymmetric S-function could be there for used for valuation of the boars growth rate in older age based on the starting control measurements of animals.
Keywords
Hrčak ID:
162657
URI
Publication date:
20.1.1994.
Visits: 625 *