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首页> 外文期刊>Journal of dairy research >Effects of dietary supplements of zinc-methionine on milk production, udder health and zinc metabolism in dairy goats
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Effects of dietary supplements of zinc-methionine on milk production, udder health and zinc metabolism in dairy goats

机译：蛋氨酸锌膳食补充剂对奶山羊产奶，乳房健康和锌代谢的影响

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Twenty-two Murciano-Cranadina dairy goats were used to investigate the effects of organic Zn supplementation of a diet containing a high level of inorganic Zn. Goats were kept in pens, machine milked once a day throughout lactation and fed a diet based on a dehydrated mixture of whole-plant maize and alfalfa ad libitum, alfalfa pellets, barley grain and a concentrate mixture. Treatments were: (1) control, and (2) supplemented with 1 g/d Zn-Methionine (Zn-Met) included in the concentrate mixture. After parturition, goats were blocked in week 3 and dietary treatments were applied until week 23. From weeks 3-20, feed intake, milk yield, milk composition, milk somatic cell count (SCC), and udder health were measured. In week 21, all goats were injected intraperitoneally with 1 g/d DL-methionine for 5 d to establish the effects of methionine under the conditions of udder stress induced by hand milking on the second day. During weeks 22 and 23, diet digestibility, and N and Zn balance were determined. Dry matter intake, milk yield, and milk contents of total solids, fat, total and true protein, and casein did not differ between treatments, but whey protein and non-protein nitrogen contents were significantly lower for the Zn-Met group. Milk SCC tended to decrease as a result of Zn-Met supplementation but differences between treatments were not significant when halves with persistent infection were excluded. Hand milking increased SCC in both groups, but udders of supplemented goats showed a lower reaction. Apparent absorption of N significantly increased and Zn retention tended to increase in Zn-Met supplemented goats. We conclude that Zn-Met supplementation can enhance resistance to udder stress in dairy goats. Effects were attributed to the organic Zn and not to the methionine component. Zn retention and protein utilization were also improved by the Zn-Met supplement.
机译：使用22只Murciano-Cranadina奶山羊来研究补充高含量无机锌日粮中有机锌的影响。将山羊饲养在围栏中，在整个泌乳期每天进行一次机器挤奶，并以全植物玉米和苜蓿的无水混合物，苜蓿颗粒，大麦籽粒和浓缩混合物为基础饲喂日粮。处理为：（1）对照，和（2）补充浓缩混合物中包含的1 g / d Zn-蛋氨酸（Zn-Met）。分娩后，在第3周封堵山羊，并进行饮食治疗直至第23周。从第3-20周开始，测量采食量，牛奶产量，牛奶成分，牛奶体细胞计数（SCC）和乳房健康。在第21周，对所有山羊腹膜内注射1g / d的DL-蛋氨酸5天，以在第二天由手挤奶引起的乳房压力条件下建立蛋氨酸的作用。在第22周和第23周，确定饮食的消化率以及氮和锌的平衡。不同处理之间干物质摄入量，产奶量和总固体，脂肪，总蛋白和真蛋白以及酪蛋白的奶含量没有差异，但是Zn-Met组的乳清蛋白和非蛋白氮含量明显较低。补充Zn-Met后，牛奶SCC趋于下降，但是当排除半数持续感染时，治疗之间的差异并不显着。两组的手挤奶均会增加SCC，但补充山羊的乳房的反应则较低。在添加了Zn-Met的山羊中，N的表观吸收显着增加，并且Zn保留趋于增加。我们得出的结论是，补充Zn-Met可以增强奶山羊对乳房压力的抵抗力。影响归因于有机锌而不是蛋氨酸成分。锌-蛋氨酸补充剂还改善了锌的保留和蛋白质利用。

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