肽在瘤胃內(nèi)的代謝和利用
頁數(shù) 7 字數(shù) 7360
摘要：
微生物蛋白降解作用形成的多肽經(jīng)過一系列肽酶最終轉(zhuǎn)化為氨基酸，其速度取決于多肽的化學(xué)組成和N端結(jié)構(gòu)。大多數(shù)情況下，瘤胃肽在棲瘤胃擬桿菌分泌的二肽基肽酶作用下，從多肽N未端釋放二肽而不是游離氨基酸。通過抑制棲瘤胃擬桿菌的二肽基肽酶活性或該菌對肽吸收率可以減慢混合瘤胃群落對肽的水解速率。肽和氨基酸刺激瘤胃微生物的生長，并且對許多種菌的最佳生長是必需的。纖維分解菌是個例外。當然, 細菌蛋白質(zhì)合成時利用氨與肽和氨基酸的比例也取決于它們的濃度。

關(guān)鍵詞：肽,瘤胃,代謝

參考文獻

Chandler-P Forestomach absorption of peptides doesn't destroy nitrogen use model.
Feedstuffs. 1996, 68: 34, 11, 15; 15 ref.
Depardon-N; Debroas-D; Blanchart-G In vitro study of molecular weight,
hydrophobicity and amino acid composition of peptides during breakdown of a casein
hydrolysate by two strains of Prevotella ruminicola. Reproduction,-
Nutrition,-Development. 1998, 38: 5, 567-576; 35 ref.
Gao-Z; Lee-SS; Lu-YA; Kim-HD; Ha-JK Effects of nitrogen sources and amonia
concentrations on the growth rates and cellulolytic enzyme activities of rumen
anaerobic fungus. Korean-Journal-of-Dairy-Science. 1998, 20: 2, 85-96; 47 ref.