鋅螯合胺基酸對荷蘭牛瘤胃性狀之影響

本試驗目的在評估熱季中乳牛日糧添加鋅螯合胺基酸對荷蘭乾乳牛瘤胃性狀之影響。試驗以4頭瘤胃廔管乾乳牛分配於等蛋白及等能量的四個處理飼糧：（A）對照組，（B）添加鋅螯合甲硫胺酸0.125％組，（C）添加鋅螯合離胺酸0.1％組，（D）添加鋅螯合甲硫胺酸0.125％及鋅螯合離胺酸0.1％組。試驗以4×4拉丁方格設計，定期輪換每期14天，最後3天為採樣期。試驗結果顯示，添加鋅螯合胺基酸對瘤胃液之pH值、氨態氮及總揮發性脂肪酸濃度無影響。個別揮發性脂肪酸中之乙酸莫耳百分比及乙酸／丙酸比於D組顯著較其他三組（P＜0.05）為高，丙酸之莫耳百分比則以D組顯著較其他組（P＜0.05）為低，丁酸與戊酸之莫耳百分比仍以A、B組顯著高於C、D兩組（P＜0.05），對異丁酸及異戊酸則無顯著影響。故乳牛飼糧中同時添加鋅螯合甲硫胺酸及離胺酸，會增加瘤胃之乙酸莫耳百分比及乙酸／丙酸比。

關鍵字

乳牛；鋅螯合胺基酸；瘤胃性狀

並列摘要

The purpose of this study was to evaluate the effects of supplementation of zinc chelated-amino acids on ruminal characteristics of Holstein dry cows during summer. Four rumen cannulated dry cows were allotted into four dietary treatments which were isocaloric and isonitrogen: (A) control, (B) supplemented with 0.125% (DM basis) of zinc chelated-methionine, (C) supplemented with 0.1% of zinc chelated-lysine, (D) supplemented with 0.125% of zinc chelated-methionine and 0.1% of zinc chelated-Iysine. This experiment was designed as 4 X 4 Latin square. The experiment was conducted four periods of time, each period being 14 days which included 11 days of adaptation and last 3 days sample collecting. The results showed that the pH value, ammonia nitrogen, and total volatile fatty acids concentrations of ruminal fluid were not significantly affected by the treatments. The acetate molar percentage and acetate/propionate ratio in Group D were higher than those of the other treatments (P＜0.05). The propionate molar percentage in Group D was lower than the others (P＜0.05). Groups A and B demonstrated a higher butyrate and valerate molar percentage than Group C or D (P＜0.05). However, the isobutyrate and isovalerate molar percentages in rumen fluid were not significantly different among the treatments. Therefore, feeding a diet supplemented with zinc chelated-methionine plus zinc chelated-lysine for dairy dry cows could increase the acetate molar percentage and acetate/propionate ratio in rumen fluid.

並列關鍵字

Dairy cows ； Zinc chelated-amino acids ； Rumen characteristics

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