Cook R H, Fadlalla B
Trop Anim Health Prod. 1987 Feb;19(1):57-62. doi: 10.1007/BF02250849.
Plasma phosphorus levels were evaluated for one hundred adult breeding ewes from transhumant producer flocks during the late rainy season (September 1984/1985), the mid-dry season (February 1985) and the late-dry season (May 1985). The percentage of non-pregnant/non-lactating ewes critically deficient in phosphorus increased from 9% in the rainy season to 56% in the late-dry season. In September 35% of pregnant ewes were critically deficient in phosphorus. During peak lactation (February) 87% of lactating ewes were critically deficient in phosphorus and 84% remained critically deficient until the start of the rainy season approximately 20 weeks postlambing. The low phosphorus content of grazing rations, which varied from 0.18% in the rainy season to 0.09% in the dry season, and low forage availability, which was especially acute during the late-dry season, appeared to be the most important factors limiting phosphorus intake.
在雨季后期（1984年9月/1985年）、旱季中期（1985年2月）和旱季后期（1985年5月），对来自游牧生产者羊群的100只成年繁殖母羊的血浆磷水平进行了评估。磷严重缺乏的未怀孕/未泌乳母羊的比例从雨季的9%增加到旱季后期的56%。9月，35%的怀孕母羊磷严重缺乏。在泌乳高峰期（2月），87%的泌乳母羊磷严重缺乏，84%的母羊直到产羔后约20周雨季开始时仍严重缺乏。放牧日粮中磷含量低，从雨季的0.18%到旱季的0.09%不等，且草料供应不足，在旱季后期尤为严重，这似乎是限制磷摄入量的最重要因素。
