菊芋粕对泌乳奶牛的营养价值评定

选用6头2～3胎泌乳中期健康荷斯坦奶牛,采用3×3有重复拉丁方试验设计,通过消化试验就菊芋粕对泌乳奶牛的营养价值进行评定。试验设3个日粮处理,处理1为基础日粮,处理2为菊芋粕替代15%基础日粮(干物质基础),处理3为菊芋粕替代30%基础日粮(干物质基础)。结果表明,菊芋粕风干样品中干物质、粗蛋白、粗脂肪、粗纤维、中性洗涤纤维、酸性洗涤纤维、粗灰分、钙、磷和产奶净能分别为92.43%,12.98%,0.81%,12.67%,25.93%,21.44%,3.92%,0.27%,0.20%和 5.18 MJ/kg;菊芋粕对泌乳奶牛干物质消化率、粗蛋白消化率、中性洗涤纤维消化率、酸性洗涤纤维消化率分别为61.78%,73.21%,51.65%,61.14%,消化能和产奶净能分别为10.13和5.18 MJ/kg;3个处理组试牛产奶量和乳成分无显著差异(P>0.05),表明菊芋粕是一种营养价值略低但养分消化率较高的能量饲料。

Nutritional evaluation of Helianthus tuberosus meal on lactating dairy cows

A 3×3 latin square design was used to determine the nutritive value of Helianthus tuberosus meal with six lactating Holstein dairy cows. 1) On an air dry basis, dry matter, crude protein, ether extract, crude fiber, nitrogen-free extract, neutral detergent fiber, acid detergent fiber, calcium, phosphorus, and milking energy of H. tuberosus meal were 92.43%, 2.98%, 0.81%, 12.67%, 25.93%, 21.44%, 3.92%, 0.27%, 0.20% and 5.18 MJ/kg respectively. H. tuberosus meal was a poor energy feed for dairy cows. 2) The digestibility of dry matter, crude protein, neutral detergent fiber and acid detergent fiber of H. tuberosus meal (on an air dry basis), were 61.78%, 73.21%, 51.65% and 61.14% respectively. The digestible energy and net energy were 10.13 and 5.18 MJ/kg. In three treatments the digestibility of compendium nutritive matters tended to decrease. H. tuberosus meal was higher in feed digestibility than the common meal and had no influence on dairy cows. 3) The addition of H. tuberosus meal to the dairy ration did not affect the production performance.