Predicting the age and weight at puberty of Ongole Grade cattle using nonlinear mathematical model in Kebumen Farmer Association

DOI: https://doi.org/10.14710/jitaa.42.4.233-239

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Article Info
Submitted: 30-03-2017
Published: 19-12-2017
Section: Articles
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This research is aimed to evaluate the nonlinear mathematical model in predicting the age and weight of Kebumen Ongole Grade (PO) cattle at puberty. The data used in this research was weight recordings of (768) PO cattle, ranging from calf (< 1 month) to adult (60 months), collected by Kebumen PO cattle Breeder Association (ASPOKEB) from 2013 to 2015. These cattle were reared by a group of farmers located in six sub-districts: Mirit, Lembu Purwo, Ambal, Puring, Petanahan, and Klirong in Kebumen district, Jawa Tengah Province. Brody, Bertalanfy, Logistic and Gompertz mathematical models were used to analyze the data. The analysis showed that the R2of the four models classify high in the category (R2 >0.70). Mature weight (A) of PO cattle predicted by Logistic (349 kg) and Gompertz (358 kg) were most appropriate. Out of the four models, the Logistic model was the most accurate in predicting the weight at puberty (174 kg) of PO cattle, but all observed cattle are still in the follicular phase.

Keywords

Inflection point; Mature weight; Logistic; Gompertz; Vaginal smear

  1. D. Maharani  Orcid
    Faculty of Animal Science, Universitas Gadjah Mada Jl. Fauna No. 3, Bulaksumur, Yogyakarta 55281, Indonesia
  2. A. H. K. Amrullah 
    Faculty of Animal Science, Universitas Gadjah Mada Jl. Fauna No. 3, Bulaksumur, Yogyakarta 55281, Indonesia
  3. D. T. Widayati 
    Faculty of Animal Science, Universitas Gadjah Mada Jl. Fauna No. 3, Bulaksumur, Yogyakarta 55281, Indonesia
  4. S. Sumadi 
    Faculty of Animal Science, Universitas Gadjah Mada Jl. Fauna No. 3, Bulaksumur, Yogyakarta 55281, Indonesia
  5. A. Fathoni 
    Faculty of Animal Science, Universitas Gadjah Mada Jl. Fauna No. 3, Bulaksumur, Yogyakarta 55281, Indonesia
  6. M. Khusnudin 
    Kebumen PO Cattle Breeder Association (ASPOKEB) Tanggulangin Village, Klirong Subdistrict, Kebumen, Jawa Tengah, Indonesia