Deng Jiajie, Zhang Siyu, Li Yingqi, Shi Changxiao, Qiu Xinjun, Cao Binghai, He Yang, Su Huawei
State Key Laboratory of Animal Nutrition, College of Animal Science and Technology, China Agricultural University, Beijing 100107, China.
College of Animal Science and Technology, Hainan University, Haikou 570228, China.
Animals (Basel). 2023 Jul 12;13(14):2284. doi: 10.3390/ani13142284.
This study aims to explore the different growth performances of the Angus bull on potato vine and leaf mixed silage in the early fattening period and to provide a reference animal production trial. Thirty-six 13-month-old Angus bulls were divided into three groups with 403.22 ± 38.97 kg initial body weight and fed with three different silage diets: (1) control: whole-plant corn silage as control (CS); (2) treatment 1: 50% whole-plant corn +50% potato vine and leaf silage (PVS1); and (3) treatment 2: 75% potato vine and leaf +15% rice straw +10% cornmeal silage (PVS2). After the 14 days pre-feeding, the formal experiment was carried out for 89 days. The result showed that the ash content of the potato vine and leaf mixed silage (PVS) in the treatment groups was higher than that in control group, and the ash content of PVS1 and PVS2 even reached 10.42% and 18.48% (DM%), respectively, which was much higher than that of the CS group at 4.94%. The crude protein content in silage also increased with the additional amount of potato vine and leaf. The apparent crude protein digestibility of the PVS groups was also significantly higher than that of the CS group ( < 0.05). In terms of serum biochemical indexes, blood urea nitrogen (BUN) in the experimental groups was significantly higher than in the control group ( < 0.05). Compared with PVS2, cholesterol (CHO) was significantly lower in the CS and PVS1 groups ( < 0.05). Moreover, the high-density lipoprotein cholesterol (HDL-C) and low-density lipoprotein cholesterol (LDL-C) of PVS2 were significantly higher than those of the CS and PVS1 group ( < 0.05), and daily gain (ADG) as a key production index had a significantly negative correlation with the CHO (r = -0.38, < 0.05) and HDL-C (r = -0.40, < 0.05) of cattle. In conclusion, PVS had higher crude protein content and ash but less starch than whole-corn silage. The PVS could replace whole-plant corn silage at the same dry matter status and did not affect the weight gain in this trial.
本研究旨在探讨安格斯公牛在育肥前期对马铃薯藤蔓和叶片混合青贮饲料的不同生长性能，并为动物生产试验提供参考。36头13月龄的安格斯公牛被分为三组，初始体重为403.22±38.97千克，分别饲喂三种不同的青贮饲料日粮：（1）对照组：以全株玉米青贮饲料作为对照（CS）；（2）处理1组：50%全株玉米+50%马铃薯藤蔓和叶片青贮饲料（PVS1）；（3）处理2组：75%马铃薯藤蔓和叶片+15%稻草+10%玉米粉青贮饲料（PVS2）。经过14天的预饲期后，进行了89天的正式试验。结果表明，处理组中马铃薯藤蔓和叶片混合青贮饲料（PVS）的灰分含量高于对照组，PVS1和PVS2的灰分含量甚至分别达到10.42%和18.48%（干物质基础），远高于CS组的4.94%。青贮饲料中的粗蛋白含量也随着马铃薯藤蔓和叶片添加量的增加而增加。PVS组的表观粗蛋白消化率也显著高于CS组（P<0.05）。在血清生化指标方面，试验组的血尿素氮（BUN）显著高于对照组（P<0.05）。与PVS2相比，CS组和PVS1组的胆固醇（CHO）显著较低（P<0.05）。此外，PVS2组的高密度脂蛋白胆固醇（HDL-C）和低密度脂蛋白胆固醇（LDL-C）显著高于CS组和PVS1组（P<0.05），作为关键生产指标的日增重（ADG）与牛的CHO（r=-0.38，P<0.05）和HDL-C（r=-0.40，P<0.05）呈显著负相关。综上所述，与全株玉米青贮饲料相比，PVS的粗蛋白含量和灰分含量较高，但淀粉含量较低。在本试验中，PVS在相同干物质状态下可替代全株玉米青贮饲料，且不影响体重增加。
