Poljoprivreda (Jun 2010)
GROWTH ANALYSIS AND ASSESSMENT OF PIG’S BIOLOGICAL MAXIMUM
Abstract
The aim of this study was to determine a mathematical model which can be used to describe the growth of domestic animals in an attempt to predict the optimal time of slaughter/weight or the development of body parts or tissues and estimate the biological maximum. The study was conducted on 60 pigs (30 barrows and 30 gilts) in the interval between the age of 49 and 215 days. By applying the generalized logistic function, the growth of live weight and tissues were described. The observed gilts reached the inflection point in approximately 121 days (I = 70.7 kg). The point at which the interval of intensive growth starts was at the age of approximately 42 days, (TB=17.35 kg) and the saturation point the pigs reached at the age of 200.5 days (TC=126.74 kg). The estimated biological maximum weight of gilts was 179.79 kg. The barrows reached the inflection point in approximately 149 days (I=92.2 kg). The point at which the intensive interval of growth starts was estimated at the age of approximately 52 days (TB=22.93 kg), and the saturation point the barrows reached at the age of 245 days (TC=164.8 kg). The estimated biological maximum weight of barrows was 233.25 kg. Muscle tissue of gilts reached the inflection point (I = 28.46 kg) in approximately 110 days. The point at which the interval of intensive growth of muscle tissue starts (TB=6.06 kg) was estimated at approximately 53 days, and the saturation point of growth (TC=52.25 kg) the muscle tissue of gilts reached at the age of 162 days. The estimated maximum biological growth of muscle tissue in gilts was 75.79 kg. The muscle tissue of barrows reached the inflection point (I=28.78 kg) in approximately 118 days, the point at which the interval of intensive growth starts (TB=6.36 kg) at the age of approximately 35 days. The saturation point of muscle tissue growth in barrows (TC=52.51 kg) was reached at the age of 202 days. The estimated maximum biological growth of muscle tissue in barrows was 75.74 kg. The fatty tissue of gilts that were observed reached the inflection point (I=11.71 kg) in approximately 143 days. The estimated biological maximum of the growth of the fatty tissue of gilts was 31. 1 kg. The fatty tissue of the observed barrows reached the inflection point (I=23.56 kg) in approximately 211 days. The estimated biological maximum for the growth of fatty tissue of barrows was 62.63 kg. The growth of bones of the observed gilts reached the inflection point (I=4.42 kg) in approximately 99 days. The estimated biological maximum for the growth observed barrows reached the inflection point (I=12.35 kg) in approximately 262 days. The estimated biological maximum growth of bones of barrows was 32.75 kg. The accuracy of prediction of the length of period was supposed to reach 100 kg of body weight using the model is satisfactory.
