摘要
本试验旨在研究亚麻籽对育肥牛肉品质及脂肪酸的影响。选择体重接近的西门塔尔杂交牛32头,采用单因素试验设计,随机分为4组,每组8头,其中试验Ⅰ组（对照组）、Ⅱ组、Ⅲ组和Ⅳ组牛饲喂亚麻籽的比例分别占精料0%,5%,10%和15%。结果表明,1）各试验组屠宰率,净肉率与对照组比较无显著差异（P〉0.05）,背膘厚度显著提高（P〈0.05）,试验Ⅳ组的背膘厚度比对照组显著提高了57.75%,牛肉中脂肪含量显著提高（P〈0.05）;2）日粮中添加亚麻籽显著降低育肥牛宰后24和48h剪切力（P〈0.01）和pH（P〈0.01）;3）日粮中添加亚麻籽使肉牛背最长肌中多不饱和脂肪酸（PUFA）显著提高（P〈0.01）。日粮中添加亚麻籽可以改善胴体品质,优化了肉牛肌肉的脂肪酸组成,特别是显著增加了PUFA含量。综合分析,亚麻籽在育肥牛日粮中的适宜饲喂比例为精料的10%~15%。
The effects of flax seed on beef quality and fatty acids in fattening cattle was studied in a single-factor design experiment. Thirty two Simmental crossbred beef with similar body weights were assigned to 4 groups with 8 duplicates in each group. The flax seed contents of the coneentrates for group II （control group）, group II, group m and group 1Y were 0%, 5%, 10G and 15% respectively. 1）There were no significant differences in slaughter rate and pure meat percentage between group 1V and the control group flax seed significantly （P〈 0.05） increased back fat thickness and fat content of beef. the fat thickness of group IV increased 57.75% com- pared with the control group 2）Adding flax seed to diet reduced shear force and pH value of longissimus at 24 and 48 h post-mortem （P〈0.01） 3）Flax seed enhanced polyunsaturated fatty acid （PUFA） content of longis- simus fatty acids significantly. These results indicate that increasing flax seed levels of diets can improve car- cass quality. Flax seed improved the fatty acid profile, especially by increasing the amounts of PUFA. A com- prehensive analysis showed that the optimal feeding level of flaxseed was 10%--15% of concentrate.
出处
《草业学报》
CSCD
北大核心
2013年第5期272-279,共8页
Acta Prataculturae Sinica
基金
国家现代农业(肉牛)产业技术体系建设专项资金(CARS-37)资助
关键词
亚麻籽
育肥牛
肉品质
脂肪酸
flax seed fattening cattle beef quality fatty acids
