Kawas Jorge R, Garcia-Mazcorro Jose F, Fimbres-Durazo Hector, Ortega-Cerrilla Maria E
Facultad de Agronomia, Universidad Autonoma de Nuevo Leon, General Escobedo 66050, Mexico.
Research and Development, MNA de Mexico, San Nicolas de los Garza 66477, Mexico.
Animals (Basel). 2020 Sep 4;10(9):1580. doi: 10.3390/ani10091580.
Choline is an essential nutrient for animals, but dietary choline is degraded in the rumen, and thus, should be offered as rumen-protected choline (RPC) in ruminants. In this article, we investigate the effect of RPC supplementation in feedlot lambs. Forty intact male Saint Croix lambs (average: 20.3 kg, 3-4 months of age) on a high grain-low roughage base feed were randomly assigned to four treatments (0, 0.1, 0.2, and 0.3% RPC on dry-matter basis; = 10 per group). RPC was offered for 90 days after 15 days of adaptation. RPC supplementation was not associated with significant differences in dry matter intake, weight gain, gain:feed ratio, carcass weights, and the dressing percentages. There was a linear decrease in height to the shoulder ( = 0.013) and longissimus muscle area ( = 0.051) with higher RPC levels, and a higher backfat thickness and yield grade with 0.3% RPC compared to 0.1% RPC ( < 0.05). Blood triglycerides concentrations were higher in control (0% RPC) compared to 0.3% RPC ( = 0.008). The lack of significant effects on growth performance and the results on backfat thickness and yield grade, may indicate undesirable effects associated with RPC supplementation. More research is needed to establish the needs and specific quantities of RPC supplementation in feedlot lambs.
胆碱是动物必需的营养物质，但日粮中的胆碱在瘤胃中会被降解，因此，反刍动物应饲喂瘤胃保护性胆碱（RPC）。在本文中，我们研究了育肥羔羊补充RPC的效果。40只完整的雄性圣克罗伊羔羊（平均体重20.3千克，3 - 4月龄），以高谷物 - 低粗饲料为基础日粮，随机分为四个处理组（按干物质计，RPC含量分别为0、0.1%、0.2%和0.3%；每组n = 10）。适应15天后，提供RPC 90天。补充RPC与干物质采食量、体重增加、增重：饲料比、胴体重和屠宰率的显著差异无关。随着RPC水平升高，肩高（P = 0.013）和背最长肌面积（P = 0.051）呈线性下降，与0.1% RPC相比，0.3% RPC的背膘厚度更高，产肉等级更高（P < 0.05）。与0.3% RPC相比，对照组（0% RPC）的血液甘油三酯浓度更高（P = 0.008）。对生长性能缺乏显著影响以及背膘厚度和产肉等级的结果，可能表明补充RPC存在不良影响。需要更多研究来确定育肥羔羊补充RPC的需求量和具体添加量。
