Abstract

Sixty-four male New Zealand White rabbits, 4 weeks old, were used to study the effects of feed restriction (FR) on growth performance, carcass traits, and some blood parameters. Rabbits were randomly allotted to 4 equal groups. The first group was fed ad libitum (control group). The second, third, and fourth groups were restricted from 4 to 8 (R4–8), 8 to 12 (R8–12), and 4 to 12 (R4–12) weeks of age, respectively. Restricted groups were fed 85% of the control. Means of live body weights (LBW), average daily gain weights (ADGW), relative growth rate (RGR) were calculated. Carcass traits and blood parameters were measured. Results showed that, FR reduced LBW, ADGW and RGR in R4–8 and R4–12 groups. However, FR did not impair the previous traits in R8–12 group. Carcass weight was not impaired in R8–12 group. However, FR reduced kidney fat in all restricted groups. Feed restriction reduced hemoglobin, red blood cell (RBC) and platelet levels in R4–8 and/or R4–12 groups. However, RBC and platelet levels were not altered in R8–12 group. Conclusively, FR impaired growth performance, carcass weight and blood parameters in R4–8 and R4–12 groups, however, the previous traits were not impaired in R8–12 group.

摘要

64 只 4 周大的雄性新西兰白兔被用来研究限食 (FR) 对生长性能、胴体性状和一些血液参数的影响。兔子被随机分配到 4 个相等的组。第一组随意喂食（控制组）。第二组、第三组和第四组分别限制在 4 至 8 (R4–8)、8 至 12 (R8–12) 和 4 至 12 (R4–12) 周龄。限制组喂食对照组的 85%。计算平均活体重（LBW）、平均日增重（ADGW）、相对生长率（RGR）。测量了胴体性状和血液参数。结果表明，FR 降低了 R4-8 和 R4-12 组的 LBW、ADGW 和 RGR。然而，FR 并没有损害 R8-12 组的先前特征。R8-12 组的胴体重量没有受损。然而，FR 减少了所有限制组的肾脏脂肪。饲料限制降低了 R4-8 和/或 R4-12 组的血红蛋白、红细胞 (RBC) 和血小板水平。然而，RBC 和血小板水平在 R8-12 组中没有改变。最终，FR 损害了增长表现，