飼糧添加血粉與保護甲硫胺酸對荷蘭牛產乳、瘤胃及血液性狀之影響

本試驗旨在探討添加血粉以提高飼糧未降解蛋白質與瘤胃保護甲硫胺酸量，對泌乳牛之產乳性能、瘤胃及血液性狀之影響。試驗採拉丁方格設計，將20頭產期、乳量相近之泌乳牛分成四個處理，分別為：（A）對照組，（B）保護甲硫胺酸組，（C）未降解蛋白質組，（D）未降解蛋白質加保護甲硫胺酸組。調配成等蛋白、等能量但未降解蛋白質含量不等之飼糧，以完全混合飼糧方式給予。試驗每期21天，預備期14天最後7天測定產乳、瘤胃及血液性狀。結果顯示，飼糧處理不影響採食量、體增重、產乳量、乳脂率、乳糖率，也不影響血漿尿素氮及總膽固醇含量。添加保護甲硫胺酸與血粉顯著提高牛乳蛋白率、固形物率及3.5%脂肪校正乳量（FCM）、乳蛋白、乳脂肪、乳糖及乳固形物之產量。添加血粉顯著提高瘤胃液之pH值及降低氨態氮之濃度，而飼糧處理不影響瘤胃液總VFA及個別VFA之產量。因此添加保護甲硫胺酸，雖無法提高產乳量，但可以增加乳成分之總產量，而添加血粉以提高未降解蛋白質含量並未能改進產乳性能。

關鍵字

保護甲硫胺酸；產乳性能；血粉

並列摘要

The purpose of this study were to investigate the effects of adding blood meal and rumen-protected methionine on the milk production and blood characteristics of dairy cows. A4×4 Latin square design was employed. A total of 20 lactating cows were randomly allocated into four groups and fed the diets with isocalorie and isoprotein but varying in undegradable protein content. The dietary treatments included Control (A), Rumen-protected methionine (RPMet) (B), Undegradable intake protein (UIP) (C), and Undergradable intake protein and rumen-protected methionine (UIP+RPMet) (D). Each period lasted for 21 days with 14 days for adaptation and seven days for data collection. The results showed that there was no dietrary effect on feed intake, milk yield, percentage of milk fat, milk lactose, weight gain, or the concentration of plasma urea nitrogen or cholesterol of cows among the treatment. The percentage of milk protein and milk solid, and yield of 3.5% FCM, milk protein, fat, lactose, and total milk solid were higher (P＜0.05) in the group fed diet added RPMet and blood meal than the other groups. In the rumen fluid, the concentration of ammonia nitrogen was lower (P＜0.05) and pH was higher (P＜0.05) in the blood meal supplement, but no difference was found in VFA compared with other supplements. Although feeding of rumen protected methionine could not increase the milk yield, it increased the milk components. The supplementation of blood meal did not improve the milk production.

並列關鍵字

Rumen-protected methionine ； Milk performance ； Blood meal

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