Predicting hot carcass weight and instantaneous body weight in young crossbred bulls and steers

• Autorzy: Pogorzelska-Przybylek P. , Nogalski Z. , Bialobrzewski I. , Sobczuk-Szul M. , Momot M.

Warianty tytułu

PL

Przewidywanie masy tuszy (WBC) buhajków i wolców mieszańców mięsnych oraz masy ciała w momencie wykonywania pomiarów (chwilowej masy ciała)

• Języki publikacji: EN

Abstrakty

EN

The aim of this study was to estimate hot carcass weight (HCW) and to determine the accuracyof predicting body weight in young bulls and steers, based on live animal measurements performedat 6 and 12 months of age and before slaughter with the use of Support Vector Machines (SVMs).Among the four analyzed kernel functions, a radial basis function (RBF) in the following form:K(u,v) = exp(-γ·||u–v||2),γ>0, whereγis the kernel’s parameter, provided the best fit. The mostaccurate and the least accurate prediction of the body weights was achieved for live animalmeasurements performed before slaughter and at 6 months of age, respectively. The highest andlowest values of the coefficient of correlation (Pearson’sr) between experimental and model HCWvalues were noted for measurements taken on the day of slaughter and at 12 months of age,respectively. Early (6 months of age) prediction of HCW could contribute to optimizing the lengthof the fattening period in beef cattle, thus helping the animals realize their full production potential

PL

Celem badań było oszacowanie masy tuszy (wbc) i dokładności przewidywania masy ciała buhajków i wolców mieszańców mięsnych, pochodzących z krzyżowania krów rasy polskiej holsztyńsko-fryzyjskiej (PHF) i buhajów ras mięsnych (HH, LM, CH), na podstawie pomiarów przyżyciowych zwierząt wykonanych w 6. i 12. miesiącu życia oraz przed ubojem, z wykorzystaniem metody Support Vector Machines (SVMs). Z czterech analizowanych funkcji jądrowych najlepsze dopasowanie uzyskano dla funkcji RBF (radial basis function) w postaci: K(u,v) = exp(-γ·||u–v||2),γ>0, gdzie:γ, jest parametrem jądra. Najlepszą możliwość przewidywania masy ciała dają przyżyciowe pomiary wykonane przed ubojem, najgorszą w wieku 6 miesięcy. Najwyższe wartości współczynnika korelacji r Pearsona między wbc „eksperymentalną” a wbc „modelową” zaobserwowano dla pomiarów wykonanych w dniu uboju, a najniższe po ukończeniu 12. miesiąca życia. Wczesne (w wiek6 miesięcy) oszacowanie wbc bydła mogłoby pomóc w zaplanowaniu optymalnej długości opasanizgodnie z predyspozycjami produkcyjnymi zwierząt.

• Wydawca: -
• Czasopismo: Polish Journal of Natural Sciences
• Rocznik: 2016
• Tom: 31
• Numer: 4
• Opis fizyczny: p.575-585,fig.,ref.

Twórcy

autor

Pogorzelska-Przybylek P.

• Department of Cattle Breeding and Milk Evaluation, Univeristy of Warmia and Mazury in Olsztyn, Michala Oczapowskiego 5, 10-719 Olsztyn, Poland

autor

Nogalski Z.

• Department of Cattle Breeding and Milk Evaluation, University of Warmia and Mazury in Olsztyn, Olsztyn, Poland

autor

Bialobrzewski I.

• Department of Systems Engineering, University of Warmia and Mazury in Olsztyn, Olsztyn, Poland

autor

Sobczuk-Szul M.

• Department of Cattle Breeding and Milk Evaluation, University of Warmia and Mazury in Olsztyn, Olsztyn, Poland

autor

Momot M.

• Department of Cattle Breeding and Milk Evaluation, University of Warmia and Mazury in Olsztyn, Olsztyn, Poland

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