کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
2454581 | 1110400 | 2006 | 12 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Evaluation of Different Mixed Model Nonlinear Functions on Pigs Fed Low-Nutrient Excretion Diets1
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کلمات کلیدی
موضوعات مرتبط
علوم زیستی و بیوفناوری
علوم کشاورزی و بیولوژیک
علوم دامی و جانورشناسی
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چکیده انگلیسی
Three nonlinear growth functions were evaluated on barrows (n=108) and gilts (n=105) fed diets designed to reduce nitrogen and phosphorous excretion. The pigs were weighed at birth and at approximate 14-d intervals from 62 to 147 d of age and then weekly to 190 d of age. Mixed models including pig specific random effects were evaluated for the Bridges, Weibull, and generalized Michaelis-Menten (GMM) functions. Two pig specific random effects were included in each function-one for predicted mature BW and one variable associated with the age at which maximum ADG was achieved. Alternative analyses were completed in which a random effect for a third parameter was predicted as a linear function of the random effect for mature BW. The alternative analyses resulted in improved likelihood statistics and smaller standard errors for the between-pig variance in mature BW. The 3 functions provided similar likelihood statistics, residual standard deviations, predicted BW, and predicted mean age (140 d for barrows and 134 d of age for gilts) and mean BW (83Â kg for barrows and 73Â kg for gilts) at which maximum ADG was achieved. The Weibull and Bridges functions predicted that 3 barrows and 6 gilts had mature BW of less than 130Â kg. The GMM function allowed for more gradual growth to 50% greater mature BW than the Weibull and Bridges functions. The GMM equation allows for nonsymmetric sigmoidal growth and in some cases may provide a better fit to the BW data of pigs.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: The Professional Animal Scientist - Volume 22, Issue 5, October 2006, Pages 401-412
Journal: The Professional Animal Scientist - Volume 22, Issue 5, October 2006, Pages 401-412
نویسندگان
A.P. Schinckel, S. Pence, M.E. Einstein, R. Hinson, P.V. Preckel, J.S. Radcliffe, B.T. Richert,