羊乳中类胰岛素生长因子I的变化规律  

Variations of insulin-like growth factor I( IGF-I) in goat milk

作　　者：侯院林[1] 张富新[1] 李龙柱[1] 于玲玲[1] 云丹[1] 雷飞燕[1] 

机构地区：[1]陕西师范大学食品工程与营养科学学院,陕西西安710119

出　　处：《江苏农业学报》2016年第4期843-847,共5页Jiangsu Journal of Agricultural Sciences

基　　金："十二五"农村领域国家科技计划项目(2013BAD18B00);农业部公益性行业(农业)科研专项(201103038);陕西省农业攻关项目(2014K01-17-05)

摘　　要：为研究羊乳中类胰岛素生长因子I(IGF-I)的浓度变化,并采集富含IGF-I的羊乳原料,采用双抗体夹心酶联免疫法测定羊乳中IGF-I的浓度。在供试的4种奶山羊(萨能羊、努比羊、垚山羊和关中羊)中,关中奶山羊乳中IGF-I的浓度最高,并且所有山羊乳品中IGF-I的浓度都显著高于牛乳中的IGF-I浓度(P<0.05)。奶山羊初乳的IGF-I浓度变化较大,泌乳第1 d的羊乳中IGF-I浓度最高,随泌乳时间的延长,其浓度显著下降(P<0.05)。常乳中IGF-I浓度比较稳定,但浓度值较低。山羊日泌乳量越小,羊乳中IGF-I浓度越大。经产奶山羊乳比初产奶山羊乳具有更高的IGF-I浓度,其中,第4胎的山羊乳中IGF-I浓度最高(P<0.05)。挤奶间隔时间24 h的山羊乳比间隔12 h的山羊乳具有更高的IGF-I浓度。Variations of insulin-like growth factor-I( IGF-I) in goat milk were studied for the collection of goat milk rich in IGF-I by double antibody sandwich enzyme-linked immunosorbent assay. The concentration of IGF-I in Guanzhong goat milk was the highest,and IGF-I concentrations in four goat breeds were higher than that in cow milk( P < 0. 05). IGFI concentrations decreased significantly during colostrum,and stayed steady at low concentrations in its late lactation. The concentrations of IGF-I decreased with increased daily milk yield,and were higher in multiparous goat's milk than that in its primiparous goat's milk. The fourth parity had the highest IGF-I concentrations. The concentrations of IGF-I in the milk of goat milked twice a day were markedly lower than that milked once a day.

关 键 词：羊乳 类胰岛素生长因子I 变化规律 

分 类 号：TS252.1[轻工技术与工程—农产品加工及贮藏工程]