Moghaddam Aliasghar, Panah Mohammad, Souri Manochehr
Department of Clinical Sciences, Faculty of Veterinary Medicine, Razi University, Kermanshah, Iran.
Department of Animal Science, Faculty of Agriculture, Razi University, Kermanshah, Iran.
Trop Anim Health Prod. 2019 Jul;51(6):1539-1544. doi: 10.1007/s11250-019-01842-0. Epub 2019 Feb 13.
The effect of an ad libitum supplementary feeding on some reproductive characteristics of ram lambs were evaluated. Twelve Sanjabi rams were allocated to one of two groups: control (C) and treatment (T). The control group received hay and the treatment group received hay and concentrate with gross energy and crude protein concentration of 4.52 Mcal and 16% of dry matter, respectively. At the end of experiment, after taking blood samples for determination of testosterone concentration (TC), all lambs were castrated and the testicular weight (TWT), testicular volume (TV), testicular length (TL), and testicular width (TW) were measured. In addition, testes were subjected to histological analysis. Body weight (BW), TC, TWT, TL, and TV in the T group were higher (P < 0.05) than the C group. However, TW was not affected by diet (P > 0.05). Animals from the C group presented lower numbers (P < 0.05) of Sertoli (SCN), germ (GCN), and Leydig cell numbers (LCN) compared to the T group. Also, seminiferous tubule diameter (STD) in the T group was significantly greater than (P < 0.05) the C group. TWT had a significant association with TC (P < 0.05), STD (P < 0.01), SCN (P < 0.01), GCN (P < 0.05), and LCN (P < 0.05). TC was correlated with STD (P < 0.01), SCN (P < 0.01), GCN (P < 0.05), and LCN (P < 0.05). STD showed close correlation with SCN (P < 0.01), GCN (P < 0.01), and LCN (P < 0.05). Also, SCN had a positive association with GCN (P < 0.01) and LCN (P < 0.05). A positive correlation was found between GCN and LCN (P < 0.01). In conclusion, the plane of nutrition of growing ram lambs enhances their growth and testicular development and probably will increases their postpubertal reproductive performance.
评估了自由采食补充饲料对公羊羔某些繁殖特性的影响。将12只桑贾比公羊分配到两组之一：对照组（C）和处理组（T）。对照组饲喂干草，处理组饲喂干草和精料，精料的总能和粗蛋白浓度分别为每千克干物质4.52兆卡和16%。实验结束时，采集血样测定睾酮浓度（TC）后，对所有羔羊进行去势，并测量睾丸重量（TWT）、睾丸体积（TV）、睾丸长度（TL）和睾丸宽度（TW）。此外，对睾丸进行组织学分析。T组的体重（BW）、TC、TWT、TL和TV均高于C组（P<0.05）。然而，TW不受日粮影响（P>0.05）。与T组相比，C组的支持细胞（SCN）、生殖细胞（GCN）和间质细胞数量（LCN）较少（P<0.05）。此外，T组的生精小管直径（STD）显著大于C组（P<0.05）。TWT与TC（P<0.05）、STD（P<0.01）、SCN（P<0.01）、GCN（P<0.05）和LCN（P<0.05）有显著相关性。TC与STD（P<0.01）、SCN（P<0.01）、GCN（P<0.05）和LCN（P<0.05）相关。STD与SCN（P<0.01）＼GCN（P<0.01）和LCN（P<0.05）密切相关。此外，SCN与GCN（P<0.01）和LCN（P<0.05）呈正相关。GCN和LCN之间呈正相关（P<0.01）。总之，生长中的公羊羔的营养水平可促进其生长和睾丸发育，并可能提高其青春期后的繁殖性能。
