干旱季节日粮中添加益生菌和过瘤胃脂肪酸对饲喂玉米青贮料生长山羊平均日增重和瘤胃代谢的影响

本试验目的在于调查添加益生菌、棕榈油过瘤胃脂肪酸(POBF)和益生菌 POBF对饲喂玉米青贮料的生长山羊平均日增重和瘤胃代谢影响.试验选用了27只约5月龄、体重(13.4±1.3)kg杂交生长山羊(Thai native×Anglo-Nubian),根据完全随机因子试验方法分成9组,进行10周饲养试验.POBF包含0、20和40 g/(goat·d)3个水平,益生菌包含0、2.5和5.0 g/(goat·d)3个水平.结果表明:POBF显著地降低日均干物质采食量(DMI)(P<0.05),益生菌提高DMI(P<0.05),20 g/(goat·d)POBF 益生菌2.5和5.0 g/(goat·d)]不影响DMI(P>0.05).益生菌和益生菌 POBF显著提高平均日增重(ADG)(P<0.05).益生菌极显著地提高DM和OM消化率(P<0.01),POBF 益生菌显著提高DM和OM消化率(P<0.05).POBF、益生菌、POBF 益生菌均提高CP消化率(P>0.05).益生菌和POBF 益生菌显著提高NDF消化率(P<0.05).益生菌、POBF和益生菌 POBF极显著提高挥发性脂肪酸总量(P<0.01)和丙酸百分比例(P<0.05),降低乙酸百分比例(P>0.05).本试验结果证明:益生菌和POBF都能提高饲喂玉米青贮料的生长山羊ADG和瘤胃代谢水平,添加2.5 g/(goat·d)益生菌和20 g/(goat·d)POBF效果较好,同时添加2.5 g/(goat·d)益生菌和20 g/(goat·d)POBF效果最佳.

Effect of Probiotics and By-pass Fat on Rumen Metabolism and Average Daily Gain of Growing Goats Fed Whole Plant Corn Silage during Dry Season

The objective of this study was to evaluate the effects of probiotics, palm oil by-pass fat (POBF), and probiotics + POBF on growing goats that were fed corn silage during dry season. Twenty-seven growing crossbred (Thai native x Anglo-Nubian) goats weighing (13.4±1.3) kg, aged about 5 months, were selected and allocated to 9 groups according to a facto-rial in a Completely randomized design (CRD). The three levels of POBF were 0, 20, and 40 g/(goat · d), and those of probiotics were 0, 2.5, and 5.0 g/(goat · d). The results showed that dry matter intake (DMI) decreased with the increasing level of POBF (P<0.05), but increased with probiotics (P<0.05), and were not affected by the probiotics + 20 g/(goat · d) POBF treatments. Average daily gain (ADG) significantly increased with probiotics and probiotics + POBF (P<0.05). Dry matter (DM) and organic matter (OM) digestibility was increased with probiotics with highly significance (P<0.01), while was increased significantly with the combination of probiotics + POBF (P<0.05). There was a significant interaction be-tween POBF and probiotics on DM and OM digestibility. However, crude protein (CP) digestibility was not affected (P> 0.05) by them; and neutral detergent fiber (NDF) digestibility decreased with the increasing level of POBF, but increased with the increasing level of probiotics. Total ruminal volatile fatty acids (VFAs) (P<0.01) and the proportion of propionic and butyric acid significantly (P<0.05) increased with probiotics, POBF, and probiotics + POBF, but the proportion of acetic acid showed a decreased tendency. There was an overall improvement in the performance of the goats fed a combination supplement of POBF and probiotics compared with the control diet. For the DMI and ADG, the 2.5 g/(goat · d) probiotics +20 g/(goat · d) POBF treatment got optimal results. If probiotics and POBF is focused on, 2.5 g/(goat· d) and 20 g/(goat · d) supplementation achieved better results.