Vargas-Bello-Pérez Einar, Darabighane Babak, Miccoli Florencia E, Gómez-Cortés Pilar, Gonzalez-Ronquillo Manuel, Mele Marcello
Department of Veterinary and Animal Sciences, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark.
Department of Animal Science, University of Mohaghegh Ardabili, Ardabil, Iran.
Front Vet Sci. 2021 Mar 12;8:641364. doi: 10.3389/fvets.2021.641364. eCollection 2021.
A meta-analysis was conducted to analyze the effects of different dietary vegetable sources rich in unsaturated FA (UFA) on sheep cheese FA profile. This study also quantified the overall effect of feeding sheep with vegetable sources rich in UFA (linseed, flaxseed, sunflower seed, canola, olive oil, bran oil, and olive cake), on milk yield (MY) and milk composition. A literature search was conducted to identify papers published from 2000 to 2019. Effect size for all parameters was calculated as standardized mean difference. Heterogeneity was determined using statistic, while meta-regression was used to examine factors influencing heterogeneity. Effect size was not significant for MY, milk fat percentage (MFP), and milk protein percentage (MPP). Dietary inclusion of vegetable sources rich in UFA decreased the effect size for C12:0, C14:0, and C16:0 and increased the effect size for C18:0, C18:1 t-11, C18:1 c-9, C18:2 c-9, t-11, C18:2 n-6, and C18:3 n-3. Heterogeneity was significant for MY, MFP, MPP, and overall cheese FA profile. Meta-regression revealed days in milk as a contributing factor to the heterogeneity observed in MFP and MPP. Meta-regression showed that ripening time is one of the factors affecting cheese FA profile heterogeneity while the type of feeding system(preserved roughages vs. pasture) had no effect on heterogeneity. Overall, inclusion of dietary vegetable sources rich in UFA in sheep diets would be an effective nutritional strategy to decrease saturated FA and increase polyunsaturated FA contents in cheeses without detrimental effects on MY, MFF, and MPP.
进行了一项荟萃分析，以分析富含不饱和脂肪酸（UFA）的不同膳食蔬菜来源对羊奶酪脂肪酸谱的影响。本研究还量化了用富含UFA的蔬菜来源（亚麻籽、亚麻籽、向日葵籽、油菜籽、橄榄油、米糠油和橄榄饼）喂养绵羊对产奶量（MY）和牛奶成分的总体影响。进行了文献检索，以确定2000年至2019年发表的论文。所有参数的效应大小计算为标准化平均差。使用统计量确定异质性，同时使用荟萃回归来检查影响异质性的因素。MY、乳脂率（MFP）和乳蛋白率（MPP）的效应大小不显著。膳食中添加富含UFA的蔬菜来源降低了C12:0、C14:0和C16:0的效应大小，并增加了C18:0、C18:1 t-11、C18:1 c-9、C18:2 c-9、t-11、C18:2 n-6和C18:3 n-3的效应大小。MY、MFP、MPP和整体奶酪脂肪酸谱的异质性显著。荟萃回归显示，产奶天数是MFP和MPP中观察到的异质性的一个促成因素。荟萃回归表明，成熟时间是影响奶酪脂肪酸谱异质性的因素之一，而喂养系统类型（保存粗饲料与牧场）对异质性没有影响。总体而言，在绵羊日粮中添加富含UFA的膳食蔬菜来源将是一种有效的营养策略，可降低奶酪中的饱和脂肪酸含量并增加多不饱和脂肪酸含量，而不会对MY、MFF和MPP产生不利影响。
