先写重点：不同的pH值对于X和Y精子的数量并无影响
直接来看你引用的这篇论文
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6755399/#ref39
论文标题是这样的
Effect of the pH in the enrichment of X or Y sex chromosome-bearing sperm in
bovine
环境pH值对于牛的X或Y精子的影响
我们直接看论文摘要的：结果
Results:
The abundance of X- and Y-bearing spermatozoa was not differed significantly
in either of the fraction collected.
结果是不同的pH值对于X和Y精子的数量并无影响
像你这样断章取义不知道是做何居心
本论文在讨论的部分也已经明确写了：本实验未发现不同pH值会影响X和Y精子的量
In human, researcher has observed that the Y-chromosome-bearing spermatozoa
were more vulnerable to fluctuations in physiological and sperm storage
conditions than X-chromosome-bearing spermatozoa [42]. Hence, we have used
different pH to check the enrichment of either X- or Y-chromosome-bearing
spermatozoa in the respective fraction. However, we could not find any
significant skewness in X- and Y-chromosome-bearing sperm population.
本研究未找到X和Y精子在不同的pH中有任何数量上的明显差异
※ 引述《mick001 (:D)》之铭言：
: It has been observed that at the time of fertilization, the pH of the vagina
: may play a role in the selection of X- or Y-bearing sperm and thereby affects
: the sex of the offspring [37]. The pH of the vagina is moderately acidic
: which varies from 3.8 to 4.5 [38]. Thus, studies have been done and patented,
: wherein sperm cells were put in an environment having physiological pH and at
: the same time contacting the sperm cells with at least one extra
: subenvironment with differing pH to enrich the population of specific type of
: sperm cells.
: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6755399/#ref39
: 据观察，在受精时，阴道的酸碱度
: 可能在选择含 X 或 Y 的精子中发挥作用，从而影响
: 后代的性别 [37]。阴道的酸碱度为中度酸性
: 从 3.8 到 4.5 [38] 不等。因此，已经完成研究并获得专利，
: 其中精细胞被置于具有生理 pH 值的环境中，并且在
: 同时与至少一个额外的精子细胞接触
: 具有不同 pH 值的亚环境以丰富特定类型的种群
: 精子细胞。
: https://i.imgur.com/1goLAut.png
: 科学上，ph值对于x/y精子的生存有极大影响。
: 想问一下版上有两位以上只有同性别宝宝的爸妈的饮食习惯！
: 推文格式范例：
: 两男，父肉食，母素食。
: 三女，父素食，母肉食。
: 感谢大家回复～