YOUNG ANIMAL FEED ▶▶▶
Standardised ileal digestible lysine requirement for high lean weanling pigs
A new study on the standardised ileal digestible lysine requirement for high lean weanling pigs confirms the industry recommendations
BY J. C. GONZÁLEZ-VEGA AND J. K. HTOO, EVONIK OPERATIONS GMBH, HANAU-WOLFGANG, GERMANY
T
300 330 360 390 420 450 480
1.00 1.20
he mean standardised ileal digestible (SID) lysine re- quirement for 7-15 kg weanling pigs of the high- lean genetic line fed corn-soybean meal-based diets to optimise body weight gain and gain to feed ratio
is 1.42%. This is the conclusion of a study conducted at the experimental pig farm of the University of Manitoba in Can- ada. In recent years, SID lysine levels fed to weanling pigs have been reported ranging from 1.32 to 1.54%. This discrep- ancy can be attributed to factors such as genetics, sanitary conditions and the different statistical methods used for data analysis. So a study was set up to determine the SID lysine re- quirement for Topigs (TN Tempo×TN70), a genotype bred for more efficient body weight gain and robustness.
Experimental design A group of 144 pigs (initial body weight (BW)= 6.51 ± 0.56 kg) were weaned at 21 days of age and assigned to one of six dietary treatments with increasing concentrations of SID lysine from 1.00 to 1.80% achieved by adding crystal- line L-Lys·HCl at the expense of corn starch. Diets were isoam- inoacidic (except lysine) and formulated to meet the require- ments of Evonik (AMINOPIG1.0). Pigs were allotted to dietary treatments with eight replicate pens/treatment, consisting of three pigs/pen (four replicates per each sex). Pigs had free ac- cess to feed and water. Feed intake and BW were recorded weekly until day 21 to calculate average daily gain (ADG), av- erage daily feed intake (ADFI), and gain to feed ratio (G:F), and blood samples were collected at days 0, 14, and 21.
Orthogonal polynomial contrasts were used to test the linear and quadratic effects of dietary SID lysine concentration. The SID lysine requirement was estimated with all replicates using a linear broken-line, a quadratic broken-line, and a quadratic model using the NLIN procedure of SAS, but the quadratic broken-line model was selected as the best fit model.
Figure 1 and 2 - SID Lys requirement for 7 to 15 kg pigs to optimize average daily gain (ADG) and gain to feed ratio (G:F) using quadratic broken line mode.
Quadratic broken-line: 1.38% Y=426.1-705.9 x (1.3821-X)2 r2: 0.39
650 680 710 740 770 800 830
1.40 SID Lys (%) 26 ▶ ALL ABOUT FEED | Volume 28, No. 9, 2020 1.60 1.80 1.00 1.20
Quadratic broken-line: 1.46% Y=814-601.1 x (1.4628-X)2 r2: 0.56
1.40 SID Lys (%)
1.60
1.80
ADG (g/day)
G:F (g/kg)
PHOTO: RONALD HISSINK
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