动物营养学报2017，Vol.29Issue(4)：1327-1334,8.DOI:10.3969/j.issn.1006-267x.2017.04.030
不同饲粮模式对奶牛乳腺长链脂肪酸摄取的影响
Effects of Different Dietary Patterns on Mammary Uptake of Long Chain Fatty Acids for Dairy Cows
摘要
Abstract
This experiment was conducted to investigate the effects of different dietary patterns on mammary uptake of long chain fatty acids for dairy cows. Thirty healthy Holstein cows with the similar parity, body weight [(554±21)] kg, lactation period [(120±24) d] and milk yield [(24.30±1.47) kg/d] were ran-domly assigned to 3 groups with ten cows each using a randomized block design. Dairy cows in 3 group were fed different pattern diets: one diet' s roughage consisted of alfalfa, Leymus chinensis and whole corn silage ( MF group) , one diet' s roughage consisted of only corn straw and containing similar nutrient level with MF group ( CS1 group) , and the last one diet' s roughage consisted of only corn straw and containing equal rough-age ratio with MF treatment ( CS2 group) . The experiment lasted for 90 days with 3 periods, and each period had 30 days. Diet, milk and blood samples were collected and examined at last 2 days of each period. The re-sult showed as follows:1) different dietary patterns had no significant effects on body weight and dry matter intake ( P>0.05) , but had significant effects on milk yield, milk fat percent and daily milk fat yield for dairy cows ( P<0.05) . The milk yield and daily milk fat yield in MF group were significantly higher than those in CS1 and CS2 groups ( P<0.05) , and above indices in CS1 group were significantly higher than those in CS2 group ( P<0.05); the milk fat percent in MF group was significantly higher than that in CS1 group ( P<0.05) . 2) Different dietary patterns had no significant effects on the concentrations of C16:0, C18:0, C18:2cis-6, C18:1cis-9 and total long chain fatty acids in artery and vein plasma for dairy cows (P>0.05). 3) Different dietary patterns had no significant effect on mammary blood flow (P<0.05), and it showed CS1 group>MF group>CS2 group. Artery supply of total long chain fatty acids was affected by different dietary patterns, which showed MF and CS1 groups was significantly bigger than CS2 group ( 5629. 51 and 6605. 02 g/d vs. 3878.91 g/d) ( P<0.05) . 4) Mammary extraction rate of total long chain fatty acids was affected by different dietary patterns, which showed MF and CS2 groups was significantly bigger than CS1 group ( 10. 99% and 10.84% vs. 7.39%) ( P<0.05) . 5) Mammary uptake of total long chain fatty acids was affected by different dietary patterns, which showed MF group ( 618. 69 g/d ) > CS1 group ( 487. 87 g/d ) > CS2 group (420.56 g/d), and the difference was significant among groups (P<0.05). This study reveales that in the condition of low quality roughage diets, it is not an effective way to improve the mammary uptake of long chain fatty acids by simply increasing the proportion of concentration.关键词
饲粮/奶牛/长链脂肪酸/摄取Key words
diet/dairy cows/long chain fatty acids/uptake分类
农业科技引用本文复制引用
刘帅旺,敖长金,白晨,张福全,康蓉..不同饲粮模式对奶牛乳腺长链脂肪酸摄取的影响[J].动物营养学报,2017,29(4):1327-1334,8.基金项目
国家"973"计划——牛奶重要营养品质形成与调控机理研究(2011CB100803) （2011CB100803）
