Re: Forum: Nutrition, Genetics and physiology
In thailand (Khonkaen Universit) we have one Experiment for Nutrition and Genetice in pig.
GRADE LEVELS OF LYSINE AT VARIOUS METHIONINE LEVELS IN
FINISHING PIGS DIET ON GROWTH PERFORMANCE
Suntorn Kakaisorn 1, Chaiyaphuk Hongladdaporn 1, Sawang Kullawong 1
and Suwit Terapuntuwat 2
1 Department of Animal Science, Faculty of Science and Technology, Loei Rajabubhat University, Loei-Chiangkan Rd., Loei, 42000
2 Department of Animal Science, Faculty of Agriculture, Khon Kaen University, Khon Kaen, 40002
This experiment was conducted to determine three levels of lysine with three levels of methionine on growth performance of finishing pig. Treatment diets were calculated for 3 levels of lysine (0.780, 1.025 and
1.270 %) and 3 levels of methionine (0.240, 0.315 and 0.390 %). Thirty-three crossbred pigs (Large white X Landrace X Duroc, 67.00 kg average body weight) were used. Twenty-seven pigs were used as experimental diet ( 9 treatments, 3 pigs per treatment). Six pigs were given protein free diet for metabolic and endrogenus nitrogen
loss determination. Pigs were kept in individual metabolism cage. The pigs given protein free diet had body weight loss 203.57 g/h/d. Daily weight gain, gain per feed, protein efficiency ratio, and net protein ratio of pigs under 9 treatment diets did not show significant different response. (P>0.05). However, pigs fed lysine 1.025 % and methionine 0.390 % showed highest average daily gain (817 g/h/d), gain per feed (351 g/kg), protein efficiency ratio (2.09) and net protein ratio (2.61). Methionine and total sulfur amino acid were calculated to be
38 % and 61 % of lysine, respectively. The levels of lysine and methionine in diet for 67 kg pig should be
1.025% and 0.390 %. Live weight pigs recommended effect of lysine and methionine levels on protein utilization
should be further investigated.
Key Words : lysine levels, methionine levels, growth performance, finishing pigs