摘要
选用16头泌乳中期荷斯坦奶牛按拉丁方设计进行试验，研究饲粮中补充0、8、12和16g·d^-1过瘤胃蛋氨酸对奶牛产奶量、乳成分以及血液氨基酸含量的影响。结果表明，与对照组相比，补饲过瘤胃蛋氨酸能够提高奶牛乳蛋白、乳脂率和酪蛋白水平。补饲过瘤胃蛋氨酸对产奶量较高（〉22kg·d^-1）的奶牛有增加产奶量的趋势，对产奶量低的奶牛没有积极作用，能提高高产奶牛乳蛋白和乳脂肪量。选用9头泌乳中期荷斯坦奶牛，在补饲过瘤胃蛋氨酸和普通蛋氨酸前后连续采血44h，探索蛋氨酸的吸收变化曲线，发现奶牛补饲过瘤胃蛋氨酸后12～16h达到吸收高峰，过瘤胃蛋氨酸能显著提高奶牛血清蛋氨酸水平，而补饲普通蛋氨酸则无明显影响。补饲过瘤胃蛋氨酸和普通蛋氨酸对血清总氨基酸水平均无显著影响。
16 Holstein dairy cows in their midlactation were selected for a 4 × 4 Latin-square design study, to investigate influence of a rumen protected methionine （Met） source at dosage of 0, 8, 12 and 16 g·d^-1, on Met absorption, milk yield, milk protein and fat. The results showed that the supplementation rumen-protected methionine increased milk protein and fat and casein. The supplementation rumen-protected methionine increased milk yield for cows that yielding exceeded 22 kg·d^-1, and no response for cows with lower yields. The quantity of milk protein and fat were improved by rumen-protected methionine in high yielding cows. 9 Holstein dairy cows in their midlactation were taken samples for 44 h before and after supplementing methionine. The result found that the addition of rumen protected methionine led to a sharp increase in the level of serum Met with a peak from 12 to 16 h following the intake. The supplementation rumen-protected methionine increased the level of serum Met, it was significant, while the addition of DL-Met did not achieve such response. The supplementation rumen-protected methionine and DL-Met had no significant effect on serum total amino acids.
出处
《南京农业大学学报》
CAS
CSCD
北大核心
2006年第3期54-58,共5页
Journal of Nanjing Agricultural University
基金
国际合作项目(060600122)
农业结构调整重大技术研究专项(20030901B)
关键词
过瘤胃蛋氨酸
奶牛
产奶量
乳品质
rumen protected methionine
dairy cow
milk yield
milk composition
