The effect of dietary supplementation with Aurantiochytrium limacinum on lactating dairy cows in terms of animal health, productivity and milk composition
The effect of dietary supplementation with Aurantiochytrium limacinum on lactating dairy cows in terms of animal health, productivity and milk composition
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DOI：
10.1111/jpn.12827
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发表时间：
2018-04-01
影响因子：
2.7
通讯作者：
Fusconi, G.
中科院分区：
文献类型：
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作者：
Moran, C. A.;Morlacchini, M.;Fusconi, G.
本研究的目的是研究日粮中添加富含二十二碳六烯酸（DHA）的微藻，橙色壶菌limacinum（AURA），对泌乳奶牛的各种健康和生产力参数的影响。将24头奶牛按胎次和产奶天数分组，然后随机分配到不添加藻类的对照组（CON; n=12）或添加100 g AURAcow（-1）天（-1）或16 g DHAcow（-1）天（-1）的治疗组（AURA; n=12）。采取了各种健康和生产力的测量，结果表明，补充剂对动物的体细胞计数，血液和生化血液参数方面没有负面影响，而身体状况略有改善藻类补充剂。未发现测量的各种产奶参数存在差异;然而，在研究的最后阶段（+4.5 kg奶牛（-1）天（-1），第78-84天），观察到AURA组的产奶量有增加的趋势。通过补充改善了牛奶的脂肪酸谱，与对照组相比，观察到饱和脂肪酸显著降低，omega-3脂肪酸显著升高，omega-3/omega-6比率改善。每天提供105 g AURAhead（-1）的奶牛的牛奶中DHA的量为4.7mg/100 g牛奶，在第49天从饲料到牛奶的峰值转移效率为8.3%。这些结果表明，每天补充105 g AURAhead（-1）导致成功地富集了牛奶中的DHA，而不会对动物的健康或生产力产生负面影响。
The aim of this study was to investigate the effect of dietary supplementation with the docosahexaenoic acid (DHA)-rich microalgae, Aurantiochytrium limacinum (AURA), on a variety of health and productivity parameters in lactating cows. Twenty-four cows were blocked by parity and number of days in milk and then randomly assigned to a control (CON; n=12) group with no algal supplementation, or a treatment group (AURA; n=12) provided with 100g AURAcow(-1)day(-1) or 16g DHAcow(-1)day(-1). A variety of health and productivity measurements were taken, and results indicated that supplementation had no negative effects on animal health in terms of somatic cell count, haematological and biochemical blood parameters, while body condition was marginally improved by algal supplementation. No differences were found for the various production parameters measured; however, a tendency towards increased milk production was observed for the AURA group during the final stage of the study (+4.5kgcow(-1)day(-1), day 78-84). The fatty acid profile of milk was improved by supplementation, with significantly lower saturated fatty acids, significantly higher omega-3 fatty acids and an improved omega-3/omega-6 ratio observed when compared to the control group. The amount of DHA in the milk of cows provided 105g AURAhead(-1)day(-1) was 4.7mg/100g milk with a peak transfer efficiency from feed to milk at day 49 of 8.3%. These results indicate that supplementation with 105g AURAhead(-1)day(-1) resulted in the successful enrichment of milk with DHA without negatively impacting the health or productivity of the animals.