Please use this identifier to cite or link to this item:
The Effects of Supplementation with Undegradable Intake Protein and Rumen Protected Amino Acid on Blood,
undegradable intake protein
rumen- protected methionine
試驗一以原位測定法（in situ）測定經熱擠壓處理的大豆粕（110℃、141 ℃），於瘤胃中培養不同時間點後蛋白質之降解率與蛋白質品質之變化；結果顯示，經141 ℃熱擠壓之大豆粕其粗蛋白質快速可溶部分減少，潛在可降解部分增加，其在瘤胃之降解速率減緩，並提高瘤胃中未降解蛋白質之比例。
Researches were conducted to evaluate the effect of applying undegradable protein(UDP) sources and protected fat, amino acids on the improvement of lactation performance of Holstein cows. In exp. 1, In situ measurement on the heat extruded soybean meal was worked and found that the solublility and rumen degradability were decreased. Nevertheless, the potential protein and the ratio of undegradable protein increased. In exp. 2 the heat extruded soybean meal(1410C) and protected fat were used to increased the energy content and undegradable protein for the lactating cows. There was no dietary effect on feed intake, milk yield and percentage of milk protein and lactose. However, the milk fat yield, 3.5% FCM and total solid yield were increased (P<0.05) when supplemented with protected fat. The concentration of blood urea nitrogen was lower (P<0.05) with the supplementation of heat extruded soybean meal. The concentration of blood cholesterol was higher (P<0.01) and the pH value in rumen extract was lower (P<0.01) when using protected fat. The concentration of ammonia nitrogen in the ruminal fluid was decreased (P<0.01) with the heat-extruded soybean meal, indicated that the nitrogen utilization was improved. In exp.3. the effect of dietary supplementation of Zn-RPMet and Zn-RPLys on ruminal characteristics were evaluated. Results showed that there was no effect on ruminal pH , ammonia nitriogen and total volatile fatty acid. The acetate molar percentage and acetate/ propionate ratio in Groups D (supplemented with Zn-RPMet and Zn-RPLys) were higher than other treatments (P<0.05). The propionate molar percentage in supplemented with Zn-RPMet and Zn-RPLys was lower (P<0.05). A higher butyrate and valerate molar percentage were obtained in Groups A (control) and B (Zn-RPMet) than Groups D (Zn-RPMet and Zn-RPLys) (P<0.05). However, the isobutyrate and isovalerate molar percentages in rumen fluid were not significantly different among the treatments. In exp.4, the effect of dietary supplementation of heat extruded soybean meal and protected methionine were evaluated. There was no dietary effect on milk yield, percentage of milk fat and milk lactose and total milk solids. The feed intake, percentage of milk protein, and 3.5% of FCM yield and milk protein, fat, lactose and total milk solid were higher (P < 0.05) in the diet added RPMet. There was no diet effect on digestibilities of dry matter, crude protein, organic matter, acid detergent fiber when measured at ruminal or total duodenal tract. Although the feeding of protected methionine could not increase the milk yield, it could increase the milk compositions production. In exp. 5, the effect of blood meal and RPMet were evaluated. Results showed that there was no dietary effect on the feed intake, weight gain, milk yield, percentage of milk fat and lactose and the plasma urea nitrogen and cholesterol. The percentage of milk protein, milk solid and 3.5% of FCM yield, the production of milk protein, fat, lactose, and total milk solid were increased (P<0.05) in the cows fed diet added RPMet and blood meal. In the rumen fluid, the concentration of ammonia nitrogen was lower (P<0.05) with the blood meal supplement , but no difference was found in VFA molar percentage among treatments. Although the feeding of rumen-protected methionine could not increase the milk yield, it increase the milk constituent production. The supplementation of blood meal to increase the UIP could not improve the milk production.
|Appears in Collections:||動物科學系|
Show full item record
TAIR Related Article
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.