L-Iysiinillä rikastettu kasvivalkuainen kalajauhon korvaajana lihasian rehuseoksessa

Authors

• Maija-Liisa Salo Helsingin yliopiston kotieläintieteen laitos
• Risto Laalahti Helsingin yliopiston kotieläintieteen laitos

DOI: https://doi.org/10.23986/afsci.72942

Abstract

A vegetable feed mixture supplemented with L-lysine was compared with fish meal as a protein supplement in barley diet for growing pigs (20–88 kg live weight). The vegetable ration consisted of 60 % soya bean meal, 15 % turnip rape meal and 25 % Torula yeast supplemented with 1 % L-lysine. The protein supplements were each fed to group of 13 barrows and 5 gilts, group I receiving the vegetable feed and group II the fish meal. The two groups received the same daily energy levels, minerals and vitamins, and their diets contained almost the same amounts of crude protein, lysine, methionine + cystine, threonine and tryptophan. The high – low feeding level system was used. There was a small difference in favour of the fish meal diet for growth rate and feed conversion ratio, and a small difference in favour of the vegetable diet for carcass characteristics, but none of the differences were significant. The main results (group I/group II) were: live weight gain 641/663 g per day, feed conversion ratio 2.71/2.63 fu per kg gain, back fat 26.0/27.2 mm, side fat 22.8/24.5 mm, area of m. long, dorsi 29.9/ 28.9 cm2 , lean meat of carcass 45,7/45.6 %, meat + bone of the most valuable parts of carcass 74.9/74.3 %, meat gain of the most valuable parts of carcass 91/91 g per dat. The profit was almost the same in the two groups. A transition period was found to be necessary for group II. However, after the pigs had become accustomed to the diet, the rather high turnip rape content (39—30 g/day) did not appear to have any harmful effects.