Perbandingan Pengukuran Metode Konvensional dan Citra Digital pada Analisis Ukuran dan Bentuk Tubuh Sapi Peranakan Ongole (PO)

Abstract

Penelitian ini bertujuan membandingkan pengukuran metode konvensional dan citra digital pada analisis ukuran dan bentuk tubuh sapi PO dewasa. Sapi PO yang diteliti berusia > 24 bulan (I2), terdiri atas 68 sapi betina dan 7 sapi jantan melibatkan sepuluh variabel permukaan tubuh linear. Uji t-Student menunjukkan bahwa terdapat persamaan hasil pengukuran pada sebagian variabel sapi PO jantan dan betina. Analisis komponen utama menjelaskan 42,1% keragaman total ukuran (size) dan 23,9% keragaman total bentuk (shape) tubuh sapi PO. Lingkar dada (X9) dinyatakan sebagai penciri ukuran (size), sedangkan panjang badan (X3) dinyatakan sebagai penciri bentuk (shape) tubuh sapi PO. Ukuran (size) citra digital memiliki keeratan hubungan terhadap ukuran (size) konvensional sebesar 0,598 dengan koefisien determinasi sebesar 35,76%, sedangkan bentuk (shape) citra digital memiliki keeratan hubungan terhadap bentuk (shape) konvensional sebesar 0,484 dengan koefisien determinasi sebesar 23,43%. Setiap peningkatan satu skor ukuran (size) konvensional akan meningkatkan skor ukuran (size) citra digital sebesar 0,7039, sedangkan setiap peningkatan satu skor bentuk (shape) konvensional akan meningkatkan skor bentuk (shape) citra digital sebesar 0,4163.

This study aims to compare conventional measurement methods and digital image to analyze the body size and shape of adult PO cattle. The studied adult PO cattle were aged > 24 months (I2), consisting of 68 females and 7 males, involving ten linear body surface variables. The student’s t-test showed that there were similar measurement results for some variables in male and female PO cattle. Principal component analysis explained 42,1% of total variance size and 23,9% of total variance shape. Chest girth (X9) was identified as the size descriptor, whereas body length (X3) was the shape descriptor of PO cattle. The size from the digital image had a correlation with the size from the conventional of 0,598, with a coefficient of determination of 35,76%, while the shape from the digital image had a correlation with the shape from the conventional of 0,484, with a coefficient of determination of 23,43%. For every one-unit increase in conventional size scores, the digital image size scores increased by 0,7039, whereas for every one-unit increase in conventional shape scores, the digital image shape scores increased by 0,4163.