Huo Qin, Sun Xuezhao, Wu Tingting, Li Zelin, Jonker Arjan, You Peihua, Li Rongquan, Li Jianping, Tian Wannian, Li Changsheng, Wang Chunqing, He Yuhua, Rugoho Innocent, Cheng Long, You Meng
The Innovation Center of Ruminant Precision Nutrition and Smart Farming, College of Animal Science and Technology, Jilin Agricultural Science and Technology University, Jilin, China.
Jilin Inter-regional Cooperation Center for the Scientific and Technological Innovation of Ruminant Precision Nutrition and Smart and Ecological Farming, Jilin, China.
Front Vet Sci. 2022 Nov 23;9:1034895. doi: 10.3389/fvets.2022.1034895. eCollection 2022.
Choline is an essential nutrient in ruminant diets, which contributes to the fundamental biological functions of the animal. However, choline is easily degraded in the rumen before it can be absorbed. Rumen-protected choline (RPC) supplementation might support the fast growth of ruminants. This study aimed to investigate the effects of supplementing graded levels of RPC in a pelleted total mixed ration for fattening lambs. Sixty three-month-old male Small Tail Han and northeast fine wool sheep hybrid lambs with a liveweight of 15.3 ± 1.8 kg (mean ± SD) were fed designated diets and randomly assigned into five treatment groups ( = 12 per group). The five treatments were the rate of RPC supplementation at 0, 1.25, 2.50, 3.75, and 5.00 g (equivalent to 0, 0.31, 0.63, 0.94, and 1.25 g of choline chloride, respectively)/kg basal diet and the RPC-supplemented feed was offered for 112 days after 12 days of adaptation. Average daily gain, dry matter intake, and nutrient digestibility were similar across treatments. The rumen pH was quadratically significant among treatments, with the lowest and highest pH observed from the 2.5 and 5 g/kg RPC supplement groups, respectively ( = 0.02). After feeding, the ruminal ammonia concentrations among treatments were different ( < 0.05), with the highest value observed from the 5 g/kg RPC supplement group. Microbial crude protein level was different, with the highest value recorded from the 0 g/kg RPC supplement group ( = 0.028). A linear effect ( < 0.05) was observed from short-chain fatty acid values among treatments before and after feeding. Serum albumin ( = 0.003) and albumin/globulin ratio ( = 0.002) had a quadratic effect, with the highest value found in the 0 g/kg RPC supplement group. Abdominal fat was higher in RPC-supplemented groups ( < 0.05) compared to the control group. Drip loss was 65% higher in RPC-supplemented groups compared to the control group ( = 0.012). Overall, the study results showed an effect of RPC on ruminal parameters, but the supplementation of low-level RPC did not improve the growth and slaughter performance of fattening lambs.
胆碱是反刍动物日粮中的一种必需营养素，对动物的基本生物学功能有重要作用。然而，胆碱在被吸收之前很容易在瘤胃中降解。补充瘤胃保护性胆碱（RPC）可能有助于反刍动物快速生长。本研究旨在探讨在育肥羔羊的颗粒全混合日粮中补充不同水平RPC的效果。选用60只3月龄、体重15.3±1.8 kg（均值±标准差）的雄性小尾寒羊和东北细毛羊杂交羔羊，饲喂指定日粮，并随机分为5个处理组（每组n = 12）。五个处理分别为RPC添加量为0、1.25、2.50、3.75和5.00 g（分别相当于0、0.31、0.63、0.94和1.25 g氯化胆碱）/kg基础日粮，在适应期12天后提供添加RPC的饲料，持续112天。各处理组的平均日增重、干物质采食量和养分消化率相似。各处理间瘤胃pH呈二次显著差异，分别在2.5和5 g/kg RPC添加组中观察到最低和最高pH（P = 0.02）。饲喂后，各处理间瘤胃氨浓度不同（P < 0.05），在5 g/kg RPC添加组中观察到最高值。微生物粗蛋白水平不同，在0 g/kg RPC添加组中记录到最高值（P = 0.028）。饲喂前后各处理间短链脂肪酸值呈现线性效应（P < 0.05）。血清白蛋白（P = 0.003）和白蛋白/球蛋白比值（P = 0.002）呈二次效应，在0 g/kg RPC添加组中发现最高值。与对照组相比，添加RPC的组腹部脂肪更高（P < 0.05）。与对照组相比，添加RPC的组滴水损失高65%（P = 0.012）。总体而言，研究结果表明RPC对瘤胃参数有影响，但低水平RPC的补充并未改善育肥羔羊的生长和屠宰性能。
