Kasza Rozália, Donkó Tamás, Matics Zsolt, Nagy István, Csóka Ádám, Kovács György, Gerencsér Zsolt, Dalle Zotte Antonella, Cullere Marco, Szendrő Zsolt
Faculty of Agricultural and Environmental Sciences, Kaposvár University, Guba S. Str. 40, H-7400 Kaposvár, Hungary.
Medicopus Nonprofit Ltd., Guba S. Str. 40, H-7400 Kaposvár, Hungary.
Animals (Basel). 2020 Oct 6;10(10):1815. doi: 10.3390/ani10101815.
The aim of this experiment was to study the effect of divergently selected rabbits for total body fat content (fat index) on growth performance and carcass traits. The fat index was determined at 10 weeks of age by computed tomography and lasted for four consecutive generations. The rabbits with the lowest fat index belonged to the lean line and those of the highest values belonged to the fat line. At generation four, 60 rabbits/line were housed in wire-mesh cages and fed with commercial pellet ad libitum from weaning (5 w of age) to slaughtering (11 w of age). Growth performance, dressing out percentage and carcass adiposity were measured. The lean line showed a better feed conversion ratio ( < 0.001) than the fat line. Furthermore, the carcass of the lean rabbits had the highest proportion of fore ( < 0.020) and hind ( 0.006) parts. On the contrary, rabbits of the fat line had the highest carcass adiposity ( 0.001). The divergent selection for total body fat content showed to be effective for both lean and fat lines. Selection for lower total body fat content could be useful for terminal male lines, while the selection for higher total body fat content could be an advantage for rabbit does in providing fat (energy) reserves.
本实验的目的是研究对全身脂肪含量（脂肪指数）进行不同方向选择的兔子对生长性能和胴体性状的影响。脂肪指数在10周龄时通过计算机断层扫描测定，并连续进行了四代。脂肪指数最低的兔子属于瘦肉系，而指数最高的兔子属于脂肪系。在第四代时，每个品系选取60只兔子，饲养在金属丝网笼中，从断奶（5周龄）到屠宰（11周龄）自由采食商业颗粒饲料。测定了生长性能、屠宰率和胴体脂肪含量。瘦肉系的饲料转化率比脂肪系更好（<0.001）。此外，瘦肉型兔子的胴体中前躯（<0.020）和后躯（0.006）的比例最高。相反，脂肪系兔子的胴体脂肪含量最高（0.001）。对全身脂肪含量进行的不同方向选择对瘦肉系和脂肪系均有效。选择较低的全身脂肪含量对终端公兔品系可能有用，而选择较高的全身脂肪含量对母兔在提供脂肪（能量）储备方面可能是一个优势。
