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奶牛乳中T_4和T_3浓度变化及其与日产奶量关系的研究 被引量:4

Study on the Relationship of T 4 and T 3 Concentrations in Milk of Dairy Cow and Daily Yield
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摘要 采用放射免疫法,测定了中国荷斯坦牛泌乳盛、中、末期乳中T4和T3浓度。结果表明:奶牛泌乳盛期乳中T4和T3浓度(1.391和0.473nmol/L)均明显高于中期(0.876和0.289nmol/L)和末期(0.837和0.227nmol/L),中期与末期之间无显著变化。奶牛在三个泌乳时期中的日产奶量与乳中T4所占比率的灰色关联度(0.962、0.967和0.819)最大,表明T4浓度变化对日产奶量的影响较T3大。 T 4 and T 3 concentration in milk of Holstein cows at peak,midand late stages of lactation were tested with radioimmunoassay(RIA) in the study.The results showed that the concentrations of T 4 and T 3 in milk of dairy cow at peak of lactation(1.391 and 0.473 nmol/L)wassignificantly higher than at mid(0.876 and 0.289 nmol/L) or late stageof lactation(0.837 and 0.227 nmol/L),respectirly.Concentration ofthyroid hormone was insignificant between mid and late stages oflactation.Grey-correlation degrees of T 4 cocentration ratio and dailyyield were the highest among the three stages of lactation,and theirgrey-correlation degree were 0.962,0.967 and 0.819,respectirely.Thechange of T 4 concentration on the effect of daily yeild was higher than T 3.
出处 《黑龙江畜牧兽医》 CAS 北大核心 1997年第6期4-6,共3页 Heilongjiang Animal Science And veterinary Medicine
关键词 乳牛 泌乳时期 甲状腺素 三碘 日产乳量 Dairy cow,Stage of lactation,T 4,T 3,Daily yeild
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