ORIGINAL PAPER
Assessment of statistical models describing individual and group response of pigs to threonine intake
J. Heger 1  
,   L. Křížová 2, 3,   M. Šustala 2,   S. Nitrayová 1,   P. Patráš 1,   D. Hampel 4
 
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1
Research Institute of Animal Production, Slovak Centre of Agricultural Research, 949-92 Nitra, Slovakia
2
Research Institute of Animal Nutrition, 691-23 Pohořelice, Czech Republic
3
Present address: Research Institute of Cattle Breeding, 691-23 Pohořelice, Czech Republic
4
Central Institute for Supervising and Testing in Agriculture, Brno, Czech Republic
CORRESPONDING AUTHOR
J. Heger   

Research Institute of Animal Production, Slovak Centre of Agricultural Research, 949-92 Nitra, Slovakia
Publication date: 2007-09-06
 
J. Anim. Feed Sci. 2007;16(3):420–432
 
KEYWORDS
ABSTRACT
A nitrogen balance experiment was conducted to study the individual and group response of growing pigs to threonine (Thr) intake. A series of fifteen purified diets with increasing concentration of Thr was fed sequentially to nine pigs during a 15-d experimental period. The concentration of Thr ranged from 50 to 140% of its assumed requirement while other essential amino acids were given in a 25 % excess. N retention was related to Thr intake using rectilinear and curvilinear models. The quadratic-plateau model fitted the individual data significantly better (P=0.02) than the linear-plateau model. The R2 statistic indicated that the group response of pigs to Thr intake was better described by the linear-plateau and quadratic-plateau models than by exponential, saturation kinetics or four-parameter logistic models. Significant differences (P=0.004) were found between individual plateau values in the linear-plateau model while the slopes of the regression lines did not differ. No significant correlation was found between the slope and plateau or breakpoint values of the linear-plateau model. Marginal efficiency of Thr utilization derived from the linear-plateau model was 0.67. In the quadratic-plateau model, marginal efficiency of Thr utilization was dependent on Thr intake and ranged from 0.77 (50% of requirement) to 0.42 (100% of requirement). Based on linear-plateau and quadratic-plateau models, daily requirement of Thr for a 45 kg pig was calculated to be 11.5 and 12.1 g, respectively
 
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4.
Individual responses of growing pigs to threonine intake
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5.
Evaluation of crude protein levels in White Pekin duck diet for 21 days after hatching
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ISSN:1230-1388