POLA PERTUMBUHAN KAMBING KACANG JANTAN DI KABUPATEN GROBOGAN (The Growth Pattern of Kacang Goat Bucks in Grobogan District)

Abstract

ABSTRAK

Penelitian ini bertujuan untuk memetakan pertumbuhan kambing Kacang jantan yang dipelihara secara tradisional oleh petani peternak di Kabupaten Grobogan. Penelitian ini menggunakan metode survei. Lokasi penelitian di tentukan dengan menggunakan metode purposive sampling berdasarkan populasi kambing Kacang terbanyak dari masing-masing kecamatan Tegowanu, Godong, Penawangan, Purwodadi, dan Gubuk. Ternak yang dijadikan objek penelitian adalah 145 ekor kambing Kacang jantan milik peternak rakyat, dengan umur yang berbeda-beda, yakni 1 sampai 12 bulan, 15, 24, 36, dan 42 bulan. Variabel yang diukur dalam penelitian ini meliputi bobot badan, lingkar dada, panjang badan, dan tinggi pundak. Hasil penelitian menunjukkan bahwa bobot badan tumbuh mengikuti pola kurva sigmoid (S) dengan persamaan regresi y=0,001x³-0,120x²+2,902x+0,552 dengan nilai koefisien determinan sebesar 97,2%, sedangkan ukuran-ukuran tubuh lingkar dada, panjang badan, dan tinggi pundak mengikuti pola polynomial dengan persamaan regresi berturut-turut y=-0,030x²+1,744x+42,92; y=-0,020x²+1,293x+37,07; dan y=-0,014x²+0,919x+45,33 dengan nilai koefisien determinasi berturut-turut sebesar 64,4; 70,1; dan 46,2%. Simpulan dari penelitian ini adalah semakin tinggi umur ternak, bobot badan dan ukuran tubuh kambing Kacang juga bertambah. Nilai koefisien determinasi tertinggi diperoleh pada bobot badan.

Kata kunci : kambing kacang jantan; bobot badan, lingkar dada; panjang badan; tinggi pundak

ABSTRACT

This research was aimed to make a chart of growth of Kacang bucks which were traditionally heaver by farmers in Grobogan District. This research used a survey method. The locations were determined using a purposive sampling method based on Kacang goat population of the sub-districts Tegowanu, Godong, Purwodadi, Penawangan, and Gubuk. The objects of research were 145 Kacang bucks belonging to small scale farmers, with different ages, i.e. 1 to 12 month, 15, 24, 36, and 42 months. The variables measured in this research were body weight, chest girth, body length, and shoulder height. The results showed that body weight followed sigmoid pattern formed a sigmoid (S) curve and the regression equation y= 0.001x³-0.120x² +2.902x + 0.552 with the value of coefficient determinant of 97.2%. Whereas chest girth, body length, and shoulder height of the shoulders follow a pattern of successive polynomial regression equation y =-0.030x²+1.744x + 42.92; y =-0.020x² +1.293x + 37.07; and y =-0.014x² + 0.919x + 45.33 with successive determination of coefficients of 64.4; 70.1; and 46.2%, respectively. It is concluded that as the bucks getting older, the body weight and measurements of bucks also increased. The highest value of coefficient determination was obtained from the body weight.

Key words : Kacang goat males; chest circumference, body weights; the length of the body; shoulder height