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首页> 外文期刊>Tropical Animal Health and Production >Reduction of phosphorus concentration in mineral supplement on fertility rate, maternal ability and costs of beef cows reared in pastures of Urochloa decumbens
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Reduction of phosphorus concentration in mineral supplement on fertility rate, maternal ability and costs of beef cows reared in pastures of Urochloa decumbens

机译：降低补充矿物质中磷的含量，对养育Urochloa decumbens牧场的肉牛的生育率，母本能力和成本产生影响

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Manufacturing and marketing of mineral mixtures with less than 40 g kg(-1) phosphorus (P) is prohibited under Brazilian regulations, although scientific evidence rejects this recommendation. Considering the hypothesis that P levels in commercial mineral supplements can be reduced without affecting animal performance and health, the objective of this experiment was to evaluate the effects of reducing the concentration of P in the mineral supplement (from 40 to 18 g kg(-1)) of a herd of beef cows grazing tropical pastures of signal grass (Urochloa decumbens). The experiment was carried out in the savanna region of Mato Grosso do Sul, Brazil, during the years 2011 to 2013. Variables analyzed included pregnancy rate, calving interval, weight of calves at weaning, and cost of mineral supplementation. There were no changes in the reproductive parameters of the herd and the weight at weaning of the calves. However, the cost of mineral supplementation was significantly lower when the herd was supplemented with the mineral mix containing only 18 g kg(-1) P. Phosphorus concentration of the forage was analyzed monthly during 1 year and averaged 1.9 +/- 0.45 g kg(-1) DM. Thus, it appears possible to reduce P content and cost of mineral supplementation without any adverse effects on the health and productivity of beef cattle herds in the State of Mato Grosso do Sul. However, the final decision should be made based on the clinical-nutritional examination and by constant technical assistance to the farm.
机译：巴西法规禁止生产和销售磷含量少于40 g kg（-1）的矿物混合物，尽管科学证据拒绝了该建议。考虑到可以降低商业矿物质补充剂中P含量而又不影响动物性能和健康的假设，本实验的目的是评估降低矿物质补充剂中P浓度（从40到18 g kg（-1）的影响））放牧信号草（Urochloa decumbens）的热带牧场的一群奶牛。该实验于2011年至2013年在巴西南马托格罗索州的热带稀树草原地区进行。分析的变量包括妊娠率，产犊间隔，断奶时犊牛体重和补充矿物质的成本。犊牛断奶时，其繁殖参数和体重没有变化。但是，如果在畜群中添加仅含18 g kg（-1）P的矿物质混合物，则补充矿物质的成本就会大大降低。在1年中每月对草料中的磷浓度进行分析，平均为1.9 +/- 0.45 g kg （-1）DM。因此，在南马托格罗索州，似乎可以减少磷的含量并降低矿物质的添加成本，而不会对肉牛群的健康和生产力产生任何不利影响。但是，最终决定应基于临床营养检查和对农场的持续技术支持来做出。

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